Kirby, Evan N., Guhathakurta, Puragra, Bolte, Michael, Sneden, Christopher, Geha, Marla C.
We present measurements of Fe, Mg, Si, Ca, and Ti abundances for 388 radial velocity member stars in the Sculptor dwarf spheroidal galaxy (dSph), a satellite of the Milky Way. This is the largest...
The Synoptic All-Sky Infrared (SASIR) Survey (2009)
Bloom, Joshua S., Prochaska, J. Xavier, Lee, William, González, J. Jesús, Ramírez-Ruiz, Enrico, Bolte, Michael, ...
We are proposing to conduct a multicolor, synoptic infrared (IR) imaging survey of the Northern sky with a new, dedicated 6.5-meter telescope at San Pedro M\'artir (SPM) Observatory. This initiative...
A Unique Star in the Outer Halo of the Milky Way (2009)
Lai, David K., Rockosi, Constance M., Bolte, Michael, Johnson, Jennifer A., Beers, Timothy C., Lee, Young Sun, ...
As part of a program to measure abundance ratios in stars beyond 15 kpc from the Galactic center, we have discovered a metal-poor star in the outer halo with a unique chemical signature. We...
Dicaesium magnesium bis(dihydrogen phosphate(V)) dihydrate (2009)
Rachid Essehli, Brahim El Bali, Mohammed Lachkar, Michael Bolte
The title compound, Cs2Mg(H2P2O7)2·2H2O, is isostructural with the related known isoformular phosphates. The crystal framework consists of corner-sharing MgO6 and H2P2O7 polyhedra, leading to...
1-(2,6-Dichlorobenzoyl)-3-(3-methoxyphenyl)thiourea (2009)
M. Khawar Rauf, Michael Bolte, Amin Badshah
The two aromatic rings in the title compound, C15H12Cl2N2O2S, enclose a dihedral angle of 37.49 (6)°. The molecule exists in the solid state in its thione form with typical thiourea...
1-(4-Chlorobenzoyl)-3-(2,4,6-trichlorophenyl)thiourea hemihydrate (2009)
M. Khawar Rauf, Michael Bolte, Amin Badshah
The asymmetric unit of the title compound, C14H8Cl4N2OS·0.5H2O, contains two independent molecules with different conformations with respect to the aromatic ring planes, and one water molecule....
1-(2,6-Dichlorobenzoyl)-3-(3,5-dichlorophenyl)thiourea (2009)
M. Khawar Rauf, Michael Bolte, Amin Badshah
The crystal structure of the title compound, C14H8Cl4N2OS, is composed of discrete molecules with bond lengths and angles quite typical for thiourea compounds of this class. The plane containing the...
(18-Crown-6-κ6O)(pyrazolato-κ2N,N′)-potassium(I) (2009)
Kerstin Kunz, Hans-Wolfram Lerner, Michael Bolte
The asymmetric unit of the title compound, [K(C3H3N2)(C12H24O6)], is composed of a potassium cation bonded to the six O atoms of a crown ether molecule and the two N atoms of a pyrazolate anion. The...
1-(3-Chlorophenyl)-3-(2,6-dichlorobenzoyl)thiourea (2009)
M. Khawar Rauf, Michael Bolte, Abdur Rauf
The structure of the title compound, C14H9Cl3N2OS, is composed of discrete molecules with bond lengths and angles quite typical for thiourea compounds of this class. The plane containing the...
1-(3-Chlorobenzoyl)-3-(2,3-dimethylphenyl)thiourea (2009)
M. Khawar Rauf, Michael Bolte, Amin Badshah
The title molecule, C16H15ClN2OS, exists in the solid state in its thione form with typical thiourea C—S and C—O bonds lengths, as well as shortened C—N bonds. An intramolecular...
1-(2,6-Dichlorobenzoyl)-3-(2,3,5,6-tetrachlorophenyl)thiourea trichloromethane hemisolvate (2009)
M. Khawar Rauf, Michael Bolte, Saeed Anwar
The title compound, C14H6Cl6N2OS·0.5CHCl3, crystallizes with four 1-(2,6-dichlorobenzoyl)-3-(2,3,5,6-tetrachlorophenyl)thiourea molecules and two trichloromethane molecules in the asymmetric...
1-(4-Chlorophenyl)-3-(2,4-dichlorobenzoyl)thiourea (2009)
M. Khawar Rauf, Michael Bolte, Amin Badshah
The title compound, C14H9Cl3N2OS, has bond lengths and angles which are quite typical for thiourea compounds of this class. The molecule exists in the solid state in its thione form with typical...
2,2′-(1-Phenyl-1H-pyrazole-3,5-diyl)diphenol (2009)
Sumeera Ikram, Amir Badshah, Aurangzeb Hasan, Michael Bolte
The title compound, C21H16N2O2, was derived from 1-(2-hydroxyphenyl)-3-(-methoxyphenyl)propane-1,3-dione. The molecular structure of the title compound is stabilized by an intramolecular...
9,9-Dimethyl-9-silafluorene (2009)
Jan Mewes, Hans-Wolfram Lerner, Michael Bolte
The title compound, C14H14Si, crystallizes with two almost identical molecules (r.m.s. deviation = 0.080 Å for all non-H atoms) in the asymmetric unit. All atoms of the silafluorene moiety...
2-[3-(4-Methoxyphenyl)-1-phenyl-1H-pyrazol-5-yl]phenol (2009)
Rukhsana Kausar, Amir Badshah, Aurangzeb Hasan, Michael Bolte
The title compound, C22H18N2O2, was derived from 1-(2-hydroxyphenyl)-3-(4-methoxyphenyl)propane-1,3-dione. The central pyrazole ring forms dihedral angles of 16.83 (5), 48.97 (4) and...
5-Bromo-17-nitro-26,28-prop-2-enoxy-25,27-dipropoxycalix[4]arene (2009)
Catharina Hippius, Frank Würthner, Michael Bolte
Molecules of the title compound, C40H42BrNO6, are located on a crystallographic twofold rotation axis. As a result, the nitro group and bromine residue are mutually disordered with equal occupancies....
4-(4-Nitrophenoxy)biphenyl (2009)
Zareen Akhter, Toheed Akhter, Michael Bolte, M. Amin Baig, Humaira M. Siddiqi
The two phenyl rings of the biphenyl unit of the title compound, C18H13NO3, are almost coplanar [dihedral angle 6.70 (9)°]. The nitrophenyl ring, on the other hand, is significantly...
4-(3-Methoxyphenoxy)butyric acid (2009)
Julia Heilmann-Brohl, Gérard Jaouen, Michael Bolte
In the title compound, C11H14O4, an intermediate for the synthesis of a new kind of estrogen receptor modulator, all non-H atoms lie on a common plane (r.m.s. deviation = 0.0472 Å). All...
(Biphenyl-2-yl)bromidobis(2-methyltetrahydrofuran-κO)magnesium(II) (2009)
Simon Nordschild, D. Wohlgemuth, Michael Bolte
In the title Grignard reagent, [MgBr(C12H9)(C5H10O)2], the Mg centre adopts a distorted tetrahedral MgCO2Br arrangement. The dihedral angle between the two aromatic rings of the biphenyl residue is...
1,5-Bis(4-nitrophenoxy)pentane (2009)
Zareen Akhter, Michael Bolte, M. Saeed Butt, Humaira M. Siddiqi
The title compound, C17H18N2O6, crystallizes with two molecules in the asymmetric unit. In both molecules, one of the C—C bonds of the pentamethylene chain connecting the two aromatic rings is...
4,4′-(Hexane-1,6-diyldioxy)dianiline (2009)
Zareen Akhter, Michael Bolte, Amna Siraj, Humaira M. Siddiqi
The complete molecule of the title compound, C18H24N2O2, is generated by a crystallographic inversion centre. The torsion angles in the hexamethylene chain are consistent with an antiperiplanar...
3-(3-Chloroanilino)-1-(3,5-dimethyl-1H-pyrazol-1-yl)propan-1-one (2009)
Aamer Saeed, Shahid Hussain, Michael Bolte
In the molecule of the title compound, C14H16ClN3O, the benzene and pyrazole rings are oriented at a dihedral angle of 3.50 (3)°. In the crystal structure, intermolecular N—H...O...
N-(Benzothiazol-2-yl)-3-chlorobenzamide (2009)
M. Khawar Rauf, Michael Bolte, Amin Badshah
The title molecule, C14H9ClN2OS, exists in the solid state in its amide form with a typical C=O bond length, as well as shortened C—N bonds. The plane containing the HNCO atoms subtends...
3-Chloro-N-cyclohexylbenzamide (2009)
M. Khawar Rauf, Michael Bolte, Amin Badshah
In the title molecule, C13H16ClNO, the mean plane of the atoms in the –CONH– group forms a dihedral angle of 42.0 (4)° with the benzene ring plane. In the crystal structure,...
(E)-3-[4-(Pentyloxy)phenyl]-1-phenylprop-2-en-1-one (2009)
Asghar Abbas, M. Khawar Rauf, Michael Bolte, Aurangzeb Hasan
The title compound, C20H22O2, crystallizes with two independent molecules in the asymmetric unit. In each molecule, all the non-H atoms lie in a common plane (r.m.s. deviations of 0.098 and...
4-Hexyloxy-3-methoxybenzaldehyde (2009)
Asghar Abbas, M. Khawar Rauf, Michael Bolte, Aurangzeb Hasan
The title compound, C14H20O3, is a synthetic analogue with a long aliphatic side chain of the important food additive and flavoring agent, vanillin. There are two independent molecules in the...
6-(4-Nitrophenoxy)hexanol (2009)
Zareen Akhter, Michael Bolte, Sajjad A. Cheema, Humaira M. Siddiqi
The title compound, C12H17NO4, features an almost planar molecule (r.m.s. deviation for all non-H atoms = 0.070 Å). All methylene C—C bonds adopt an antiperiplanar conformation. In...
4-Chloro-N-m-tolylbenzamide (2009)
Aamer Saeed, Madiha Irfan, Michael Bolte
In the title compound, C14H12ClNO, the dihedral angle between the two aromatic rings is 11.29 (15)°. The crystal packing is stabilized by N—H...O hydrogen bonds linking the molecules...
2-Chloro-5-nitroaniline (2009)
Aamer Saeed, Zaman Ashraf, Mahira Batool, Michael Bolte
The molecule of the title compound, C6H5ClN2O2, is close to being planar (rms deviation = 0.032 Å for all non-H atoms), with a maximum deviation of −0.107 (3) Å for...
4,4′-[4,4′-(Perfluoropropane-2,2-diyl)bis(4,1-phenyleneoxy)]dianiline (2009)
Haq Nawaz, Zareen Akhter, Michael Bolte, Humaira M. Siddiqui
In the title compound, C27H20F6N2O2, the dihedral angles between the planes of the aromatic rings connected by the ether O atoms are 84.13 (8) and 75.06 (9)°. The crystal structure...
N-(3-Bromophenyl)-3,4,5-trimethoxybenzamide (2009)
Aamer Saeed, Shahid Hussain, Aliya Ibrar, Michael Bolte
In the title compound, C16H16BrNO4, the dihedral between the planes of the aromatic rings is 7.74 (18)°. The amide group is tilted with respect to the bromo- and methoxy-substituted...
4-Fluoro-N-[3-(2-fluorophenyl)-4-methyl-2,3-dihydro-2-thienylidene]benzamide (2009)
Aamer Saeed, Uzma Shaheen, Muhammad Latif, Michael Bolte
In the title compound, C17H12F2N2OS, the planar thiazole ring (r.m.s. deviation = 0.012 Å) makes dihedral angles of 15.08 (9) and 81.81 (6)° with the 4-fluorophenyl and...
2,2′-Dimethyl-2,2′-(m-phenylenedimethylene)propanedinitrile (2009)
Junmei Zhao, Volker Böhmer, Michael Bolte
The title compound, C16H14N4, features an aromatic ring with two 2,2′-dicyanopropyl residues in positions 1 and 3, which are located above and below the ring plane. The two residues differ in...
Dibromidotris(dimethylamine)magnesium(II) (2009)
Hannes Vitze, Hans-Wolfram Lerner, Michael Bolte
The Mg centre in the title compound, [MgBr2(C2H7N)3], is pentacoordinated in a trigonal-bipyramidal mode with the two Br atoms in axial positions and the N atoms of the dimethylamine ligands in...
Maryam Zahid, M. Khawar Rauf, Michael Bolte, Shahid Hameed
The title compound, C11H17NS, is an important intermediate for the synthesis of biologically active adamantlythiazolo-oxadiazoles. The adamantyl residue is disordered about a twofold rotation axis...
3-(4-Bromophenylsulfonyl)-8-methyl-1,3-diazaspiro[4.5]decane-2,4-dione (2009)
M. Kalim Kashif, M. Khawar Rauf, Michael Bolte, Shahid Hameed
The crystal structure of the title compound, C15H17BrN2O4S, is stabilized by intermolecular N—H...O hydrogen bonds which link the molecules into centrosymmetric dimers. The dihedral angle...
3-(4-Chlorophenylsulfonyl)-8-methyl-1,3-diazaspiro[4.5]decane-2,4-dione (2009)
M. Kalim Kashif, M. Khawar Rauf, Michael Bolte, Shahid Hameed
In the title compound, C15H17ClN2O4S, the atoms in the hydantoin ring are coplanar (r.m.s. deviation = 0.006 Å). The crystal structure is stabilized by intermolecular N—H...O...
Bis[5-(4-methoxybenzyl)furan-3-yl]methanone (2009)
The title compound, C25H22O5, was obtained by a dehydrogenative carbonylation reaction. It crystallizes with one half-molecule in the asymmetric unit. The molecules have crystallographic C2 symmetry...
Ethyl 4-[3-(2-methylbenzoyl)thioureido]benzoate (2009)
Aamer Saeed, Hummera Rafique, Amara Mumtaz, Michael Bolte
The molecular conformation of the title compound, C18H18N2O3S, is stabilized by an intramolecular N—H...O hydrogen bond. The crystal packing shows centrosymmetric dimers connected by...
Dimethyl 2,2′-[butane-1,4-diylbis(sulfanediyl)]dibenzoate (2009)
Iván Brito, Alejandro Cárdenas, Joselyn Albanez, Michael Bolte, Matías López-Rodríguez
The title compound, C20H22O4S2, was synthesized by the reaction of 1,4-dibromobutene with methyl thiosalicylate. The aliphatic segment of this ligand is in an all-trans conformation. The bridging...
Pyridinium-2-carboxylate–benzene-1,2-diol (1/1) (2009)
The title compound, C6H5NO2·C6H6O2, crystallizes with one pyridinium-2-carboxylate zwitterion and one molecule of benzene-1,2-diol in the asymmetric unit. The crystal structure is characterized...
Bis(2,6-dicarboxypyridinium) dichloride acetone monosolvate (2009)
The title compound, 2C7H6NO4+·2Cl−·C3H6O, crystallizes with two 2,6-dicarboxypyridinium cations, two chloride anions and one acetone molecule in the asymmetric unit. The crystal...
2-Hydroxybenzyl alcohol–phenanthroline (1/1) (2009)
Crystals of the title compound, C12H8N2·C7H8O2, were obtained during cocrystallization experiments of a compound with two hydrogen-bond donors (2-hydroxybenzyl alcohol) with another compound...
Williams, Kurtis A., Bolte, Michael, Koester, Detlev
We present a photometric and spectroscopic study of the white dwarf population of the populous, intermediate-age open cluster M35 (NGC 2168); this study expands upon our previous study of the white...
Informalisiertes Zeithandeln (2008)
Zentrales empirisches Ergebnis dieser Arbeit ist eine Typenbildung der individuellen Formen von Zeitorganisation. Das zentrale theoretische Ergebnis dieser Arbeit besteht im Konzept des...
Detailed Abundances for 28 Metal-poor Stars: Stellar Relics in the Milky Way (2008)
Lai, David K., Bolte, Michael, Johnson, Jennifer A., Lucatello, Sara, Heger, Alexander, Woosley, S. E.
We present the results of an abundance analysis for a sample of stars with $-4
(Z)-N-[3-(2-Methoxyphenyl)-4-phenyl-2,3-dihydrothiazol-2-ylidene]-4-methylbenzamide (2008)
Aamer Saeed, Sabah Zaman, Michael Bolte
Geometric parameters of the title compound, C24H20N2O2S, are in the usual ranges. The central heterocycle makes dihedral angles of 41.29 (4) and 72.94 (5)° with the phenyl ring and...
2-Aminopyrimidinium picrate (2008)
B. Narayana, B. K. Sarojini, K. Prakash Kamath, H. S. Yathirajan, Michael Bolte
The geometric parameters of the title compound, C4H6N3+·C6H2N3O7−, are in the usual ranges. While two nitro groups are almost coplanar with the aromatic picrate ring [dihedral angles...
Phthalazin-1(2H)-one–picric acid (1/1) (2008)
H. S. Yathirajan, B. Narayana, M. T. Swamy, B. K. Sarojini, Michael Bolte
The geometric parameters of the title compound, C8H6N2O·C6H3N3O7, are in the usual ranges. The three nitro groups are almost coplanar with the aromatic picrate ring [dihedral angles...
1,2-Bis(phenylphosphoryl)ethane (2008)
Franz Dornhaus, Hans-Wolfram Lerner, Michael Bolte
The geometric parameters of the molecule of the title compound, C14H16O2P2, are in the usual ranges. It is a meso compound with the two chiral P atoms having opposite configurations. The...
N-(2-Methylphenyl)-2-nitrobenzamide (2008)
Aamer Saeed, Shahid Hussain, Michael Bolte
In the title compound, C14H12N2O3, the dihedral angle between the two aromatic rings is 41.48 (5)°. The nitro group is twisted by 24.7 (3)° out of the plane of the aromatic ring...
μ-Hydroxido-bis[(2,2′-bipyridine)tricarbonylrhenium(I)] perrhenate (2008)
Kai Ruth, Thorsten Morawitz, Hans-Wolfram Lerner, Michael Bolte
The title compound, [Re2(OH)(C10H8N2)2(CO)6][ReO4], is a mixed-valence rhenium compound containing discrete anions and cations. The ReI atoms are in a slightly distorted octahedral environment,...
N-(2-Methoxyphenyl)-2-nitrobenzamide (2008)
Aamer Saeed, Shahid Hussain, Michael Bolte
Geometric parameters of the title compound, C14H12N2O4, are in the usual ranges. The dihedral angle between the two aromatic rings is 28.9 (1)°. The nitro group is twisted by...
Hannah Steinert, Hans-Wolfram Lerner, Michael Bolte
The title compound, C18H15BrSi, crystallizes with two almost identical molecules (r.m.s. deviation for all non-H atoms = 0.074 Å) in the asymmetric unit. It is isomorphous with...
1,1,1,3,3,3-Hexafluoro-2,2-bis[4-(4-nitrophenoxy)phenyl]propane (2008)
H. Nawaz, Zareen Akhter, Michael Bolte, M .S. Butt, Humaira M. Siddiqi
In the title compound, C27H16F6N2O6, the nitro groups are almost coplanar with the aromatic rings to which they are attached [dihedral angles = 3.5 (5) and 6.2 (3)°]. The dihedral...
3-(2-Hydroxyphenyl)-5-(2-methoxyphenyl)-1H-pyrazole (2008)
Aurangzeb Hasan, Sumera Ikram, Amir Badshah, Michael Bolte, Mehwash Zia
The title compound, C16H14N2O2, was derived from 1-(2-hydroxyphenyl)-3-(2-methoxyphenyl)propane-1,3-dione. The molecule is essentially planar (r.m.s. deviation for all non-H atoms =...
4,4′-Dimethyl-2,2′-bipyridinium dichloride (2008)
Urs David Eckensberger, Hans-Wolfram Lerner, Michael Bolte
In the title compound, C12H14N22+·2Cl−, the 4,4′-dimethyl-2,2′-bipyridinium cation is essentially planar (r.m.s. deviation for all non-H atoms = 0.004 Å) and is...
N-[4-(4-Nitrophenoxy)phenyl]propionamide (2008)
Asifa Nigar, Zareen Akhter, Michael Bolte, Humaira M. Siddiqi, Rizwan Hussain
The title compound, C15H14N2O4, is an important intermediate for the synthesis of thermotropic liquid crystals. The dihedral angle between the two aromatic rings is 84.29 (4)°. An...
N-(3-Nitrobenzylidene)aniline (2008)
Muhammad Zaheer, Zareen Akhter, Michael Bolte, Humaira M. Siddiqi
In the title compound, C13H10N2O2, a Schiff base derivative, the dihedral angle between the two aromatic rings is 31.58 (3)°. The C=N double bond is essentially coplanar with the...
NGC 2419, M92, and the Age Gradient in the Galactic Halo (2007)
William Harris, Roger A. Bell, Don A. Vandenberg, Michael Bolte, Peter B. Stetson, James E. Hesser, ...
The WFPC2 camera on HST has been used to obtain photometry of the low-metallicity ([Fe/H] = \Gamma2:14), outer-halo globular cluster NGC 2419. Our color-magnitude diagram in (V; V \Gamma I) reaches V...
i80 Nora Rempfer et al. NH 4 Cr(SO4) 2 (2007)
Doi Acta Cryst, Michael Bolte, Key Indicators
n, 1934), RbAl(SO 4 ) 2 - 12H 2 O (Larson & Cromer, 1967), NH 4 Al(SO 4 ) 2 (Larson & Cromer, 1967; Abdeen et al., 1981) and KV(SO 4 ) 2 2 O (Beattie et al., 1996). Although Nyburg et al....
Acta Crystallographica Section, Friederike Heinicke, Hans-wolfram Lerner, Michael Bolte, Key Indicators, Triclinic P
leck, Kolitsch, Hertweck, Giester et al., 2002) and KMgH(SeO 4 ) 2 2 O (Troyanov & Morozov, 2002). Experimental Crystals of the title compound were obtained from a solution of equimolar amounts...
A Search for Binary Stars at Low Metallicity (2007)
Lai, David K., Lucatello, Sara, Bolte, Michael, Fischer, Debra A., Johnson, Jennifer A.
We present initial results measuring the companion fraction of metal-poor stars ([Fe/H]$
Carbon and Strontium Abundances of Metal-Poor Stars (2007)
Lai, David K., Johnson, Jennifer A., Bolte, Michael, Lucatello, Sara
We present carbon and strontium abundances for 100 metal-poor stars measured from R$\sim $7000 spectra obtained with the Echellette Spectrograph and Imager at the Keck Observatory. Using spectral...
Photometry of the Globular Cluster NGC 5466: Red Giants and Blue Stragglers (2007)
Fekadu, Nassissie, Sandquist, Eric L., Bolte, Michael
We present wide-field BVI photometry for about 11,500 stars in the low-metallicity cluster NGC 5466. We have detected the red giant branch bump for the first time, although it is at least 0.2 mag...
Williams, Kurtis A., Bolte, Michael
We present photometric and spectroscopic studies of the white dwarf (WD) populations in the intermediate-age open clusters NGC 6633 and NGC 7063 as part of the ongoing Lick-Arizona White Dwarf Survey...
The Blue Straggler Population of the Globular Cluster M5: Comparison with M3 (2006)
Warren, Steven R., Sandquist, Eric L., Bolte, Michael
We have surveyed the blue straggler star population of the Galactic globular cluster M5 using high-resolution images of the core along with wide-field ground-based images reaching to more than 19...
A Hot DQ White Dwarf in the Open Star Cluster M35 (2006)
Williams, Kurtis A., Liebert, James, Bolte, Michael, Hanson, Robert B.
We report the discovery of a hot DQ white dwarf, NGC 2168:LAWDS 28, that is a likely member of the 150-Myr old cluster NGC 2168 (Messier 35). The spectrum of the white dwarf is dominated by CII...
Abdeljalil El Fatmi, Maria Daoudi, Najib Ben Larbi, Abdelali Kerbal, Mohamed Filali Kaba, Brahim El Bali, ...
n/a
The Unusual Luminosity Function of the Globular Cluster M10 (2005)
Pollard, Denise L., Sandquist, Eric L., Hargis, Jonathan R., Bolte, Michael
We present the I-band luminosity function of the differentially reddened globular cluster M10. We combine photometric analysis derived from wide-field (23' x 23') images that include the outer...
Abdeljalil El Fatmi, Maria Daoudi, Najib Ben Larbi, Abdelali Kerbal, Mohamed Filali Baba, Brahim El Bali, ...
n/a
Clark, L. Lee, Sandquist, Eric L., Bolte, Michael
We present high-precision VI photometry of stars from the middle of the giant branch to about 5 magnitudes below the main-sequence turnoff in the globular cluster Palomar 13 based on images obtained...
Williams, Kurtis A., Bolte, Michael, Liebert, James
We present spectroscopic observations of the remaining four candidate white dwarfs in Praesepe. All four candidates are quasars with redshifts between 0.8 and 2.8. One quasar, LB 6072, is observed to...
Exploring the Upper Red Giant and Asymptotic Giant Branches: the Globular Cluster M5 (2004)
Sandquist, Eric L., Bolte, Michael
We have tabulated lists of upper red giant, horizontal, and asymptotic giant branch (RGB, HB, AGB) stars in the globular cluster M5 that are complete to over 10' from the core for the RGB and AGB...
The Luminosity Function and Color-Magnitude Diagram of the Globular Cluster M12 (2004)
Hargis, Jonathan R., Sandquist, Eric L., Bolte, Michael
In this paper we present the V and I luminosity functions and color-magnitude diagrams derived from wide-field (23 arcmin by 23 arcmin) BVI photometry of the intermediate metallicity ([Fe/H]=-1.3)...
The s-process in metal-poor stars: Abundances for 22 neutron-capture elements in CS 31062-050 (2004)
Johnson, Jennifer A., Bolte, Michael
The CH star CS 31062-050 ([Fe/H]=-2.42) is one of the most useful stars yet discovered for evaluating the s-process in metal-poor stars. It is very abundant in heavy elements (e.g., [La/Fe]=2.2), and...
Ali El Antri, Ibtissam Messouri, Mohamed Bouktaib, Rachid El Alami, Michael Bolte, Brahim El Bali, ...
Two tetrahydroisoquinoline alkaloids were extracted from the alkaloid fraction of a methanol extract of the seeds of Calycotome Villosa Subsp. intermedia. Their structures were established as...
3-Nitroso-2-phenylimidazo[1,2-a]pyrimidine (2004)
Abderahmane Anaflous, Nour-eddine Benchat, Taibi Ben-Hadda, Brahim El Bali, A Taibi, Michael Bolte, ...
this paper. Bond lengths and angles of (I) do not show any unusual values. The phenyl and nitroso groups are almost coplanar with the imidazo[1,2-a]pyrimidine moiety (Table 1). The molecules...
The C IV Mass Density of the Universe at Redshift 5 (2003)
Pettini, Max, Madau, Piero, Bolte, Michael, Prochaska, Jason X., Ellison, Sara L., Fan, Xiaohui
In order to search for metals in the Lyman alpha forest at redshifts z > 4, we have obtained spectra of high S/N and resolution of three QSOs at z > 5.4 discovered by the Sloan Digital Sky Survey....
Lerner, Hans-Wolfram, Scholz, Stefan, Bolte, Michael, Wiberg, Nils, Noth, Heinrich, Krossing, Ingo
The alk.-earth metal silanides, (tBu3Si)2Be and (tBu3Si)2Mg, were synthesized from the reaction of the Na silanide tBu3SiNa with BeCl2 in Bu2O and MgBr2 in THF. [(TBu3Si)2Mg(THF)2] reacts with GaBr3...
The r-process in the early Galaxy (2002)
Johnson, Jennifer A., Bolte, Michael
We report Sr, Pd and Ag abundances for a sample of metal-poor field giants and analyze a larger sample of Y, Zr, and Ba abundances. The [Y/Zr] and [Pd/Ag] abundance ratios are similar to those...
The white dwarf cooling sequence in the old open cluster NGC 188 (2002)
Andreuzzi, Gloria, Richer, Harvey B., Limongi, Marco, Bolte, Michael
We develop the white dwarf luminosity function (LF) of the old open cluster NGC 188 in order to determine a lower limit to the age of the cluster by using the faint end of the cooling sequence. To...
Determination of the Dark Matter Profile of Abell 2199 from Integrated Starlight (2002)
Kelson, Daniel D., Zabludoff, Ann I., Williams, K. A., Trager, S. C., Mulchaey, J. S., Bolte, Michael
We have obtained deep, long-slit spectroscopy along the major axis of NGC 6166, the cD galaxy in the cluster Abell 2199, in order to measure the kinematics of intracluster starlight at large radii....
Th Ages for Metal-Poor Stars (2001)
Johnson, Jennifer A., Bolte, Michael
With a sample of 22 metal-poor stars, we demonstrate that the heavy element abundance pattern (Z > 55) is the same as the r-process contributions to the solar nebula. This bolsters the results of...
Flint, Kathleen, Metevier, Anne J., Bolte, Michael, De Oliveira, Claudia Mendes
We present a program to study the galaxy luminosity function (GLF) of the Leo I and Coma I Groups at ~10 Mpc. We have surveyed over seven square degrees in Leo I and ~11 square degrees in Coma I. In...
The Dwarf Galaxy Population of the Dorado group down to Mv=-11 (2000)
Carrasco, E. R., De Oliveira, C. M., Infante, Leopoldo, Bolte, Michael
We present V and I CCD photometry of suspected low-surface brightness dwarf galaxies detected in a survey covering ~2.4 deg^2 around the central region of the Dorado group of galaxies. The...
Stetson, Peter B., Bolte, Michael, Harris, William E., Hesser, James E., Bergh, Sidney Van Den, VandenBerg, Don A., ...
We have used the WFPC2 camera on the Hubble Space Telescope to obtain photometry of the outer-halo globular clusters Palomar 3, Palomar 4, and Eridanus. These three are classic examples of the...
HST Photometry of the Globular Cluster M4 (1998)
Ibata, Rodrigo A., Richer, Harvey B., Fahlman, Gregory G., Bolte, Michael, Bond, Howard E., Hesser, James E., ...
This paper presents a detailed description of the acquisition and processing of a large body of imaging data for three fields in the globular cluster M4 taken with the Wide Field and Planetary Camera...
White Dwarfs in Globular Clusters: HST Observations of M4 (1997)
Richer, Harvey B., Fahlman, Gregory G., Ibata, Rodrigo A., Pryor, Carlton, Bell, Roger A., Bolte, Michael, ...
Using WFPC2 on the Hubble Space Telescope, we have isolated a sample of 258 white dwarfs (WDs) in the Galactic globular cluster M4. Fields at three radial distances from the cluster center were...
Composition Mixing during Blue Straggler Formation and Evolution (1996)
Sandquist, Eric L., Bolte, Michael, Hernquist, Lars
We use smoothed-particle hydrodynamics to examine differences between direct collisions of single stars and binary star mergers in their roles as possible blue straggler star formation mechanisms. We...
Sandquist, Eric L., Bolte, Michael, Stetson, Peter B.
We present new BVI photometry for the halo globular cluster M5, and examine the B- and I-band luminosity functions (LFs), based on over 20,000 stars. We do not see evidence in the LF of a ``subgiant...
The Relative Ages of Galactic Globular Clusters (1996)
Stetson, Peter B., VandenBerg, Don A., Bolte, Michael
We discuss the present state of knowledge and thought concerning the spread in age found among Galactic globular clusters, with some discussion of the implications for what happened during the...
Fossil Signatures of Ancient Accretion Events in the Halo (1996)
Johnston, Kathryn V., Hernquist, Lars, Bolte, Michael
The role that minor mergers have played in the formation and structure of the Milky Way is still an open question, about which there is much debate. We use numerical simulations to explore the...
Hubble Space Telescope Observations of White Dwarfs in the Globular Cluster M4 (1995)
Richer, Harvey B., Fahlman, Gregory G., Ibata, Rodrigo A., Stetson, Peter B., Bell, Roger A., Bolte, Michael, ...
With the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope, we have discovered in M4 (NGC 6121, C 1620-264) the first extensive sequence of cooling white dwarfs seen in a globular...
Modeling the Radial Distribution of Blue Stragglers in M3 (1994)
Sigurdsson, Steinn, Davies, Melvyn B., Bolte, Michael
Recent surveys of the blue straggler (BS) population in the galactic globular cluster M3 (NGC 5272) give the first complete characterization of the number density of BSs as a function of radius over...