XMM-Newton detection of a delayed X-ray eruption from V838 Monocerotis (2009)
Antonini, Fabio, Montez, Rodolfo Jr., Kastner, Joel H., Bond, Howard E., Soker, Noam, Tylenda, Romuald, ...
We report the XMM-Newton/EPIC detection in 2008 March of a pair of spatially confused X-ray sources in the vicinity of the enigmatic star V838 Mon, which underwent a spectacular outburst in early...
Benedict, G. Fritz, McArthur, Barbara E., Napiwotzki, Ralf, Harrison, Thomas E., Harris, Hugh C., Nelan, Edmund, ...
We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our...
The 2008 Luminous Optical Transient in the Nearby Galaxy NGC 300 (2009)
Bond, Howard E., Bedin, Luigi R., Bonanos, Alceste Z., Humphreys, Roberta M., Prieto, Jose L., ...
A luminous optical transient (OT) that appeared in NGC 300 in early 2008 had a maximum brightness, M_V ~ -12 to -13, intermediate between classical novae and supernovae. We present ground-based...
The WFC3 Galactic Bulge Treasury Program: A First Look at Resolved Stellar Population Tools (2008)
Brown, Thomas M., Sahu, Kailash, Zoccali, Manuela, Renzini, Alvio, Ferguson, Henry C., Anderson, Jay, ...
[Abridged] When WFC3 is installed on HST, the community will have powerful new tools for investigating resolved stellar populations. The WFC3 Galactic Bulge Treasury program will obtain deep imaging...
Bond, Howard E., Sparks, William B.
The luminous Galactic Cepheid RS Puppis is unique in being surrounded by a dust nebula illuminated by the variable light of the Cepheid. In a recent paper in this journal, Kervella et al. (2008)...
Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC Photometry (2008)
Clarkson, Will, Sahu, Kailash, Anderson, Jay, Smith, T. Ed., Brown, Thomas M., Rich, R. Michael, ...
We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted for more than...
A Three-Decade Outburst of the LMC Luminous Blue Variable R127 Draws to a Close (2008)
Walborn, Nolan R., Stahl, Otmar, Gamen, Roberto C., Szeifert, Thomas, Morrell, Nidia I., Smith, Nathan, ...
The paradigmatic Luminous Blue Variable R127 in the Large Magellanic Cloud has been found in the intermediate, peculiar early-B state, and substantially fainter in visual light, signaling the final...
Direct Detection of the Close Companion of Polaris with the Hubble Space Telescope (2008)
Evans, Nancy Remage, Schaefer, Gail H., Bond, Howard E., Bono, Giuseppe, Karovska, Margarita, Nelan, Edmund, ...
Polaris, the nearest and brightest classical Cepheid, is a single-lined spectroscopic binary with an orbital period of 30 years. Using the High Resolution Channel of the Advanced Camera for Surveys...
HD 148937: A multiwavelength study of the third galactic member of the Of?p class (2008)
Naze, Yaël, Walborn, Nolan R., Rauw, Grégor, Martins, Fabrice, Pollock, A. M. T., Bond, Howard E.
Three Galactic O-type stars belong to the rare class of Of? p objects: HD 108, HD 191612, and HD 148937. The first two stars show a wealth of phenomena, including strong X-ray emission, light...
Planets in the Galactic Bulge: Results from the SWEEPS Project (2007)
Sahu, Kailash C., Casertano, Stefano, Valenti, Jeff, Bond, Howard E., Brown, Thomas M., Smith, T. Ed, ...
The exoplanets discovered so far have been mostly around relatively nearby and bright stars. As a result, the host stars are mostly (i) in the Galactic disk, (ii) relatively massive, and (iii)...
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...
Transient Mass-Loss Events in the PG 1159 Central Star of Longmore 4 (2007)
A spectacular, transient mass-loss event in the hydrogen-deficient central star of the planetary nebula Longmore 4 was discovered in 1992 by Werner et al. During that event, the star temporarily...
Sparks, William B., Bond, Howard E., Cracraft, Misty, Levay, Zolt, Crause, Lisa A., Dopita, Michael A., ...
Following the outburst of the unusual variable star V838 Monocerotis in 2002, a spectacular light echo appeared. A light echo provides the possibility of direct geometric distance determination,...
The Bizarre Spectral Variability of Central Stars of Planetary Nebulae (2007)
De Marco, Orsola, Wortel, S., Bond, Howard E., Harmer, Dianne
A radial velocity (RV) survey to detect central stars in binary systems was carried out between 2002 and 2004. De Marco et al. (2004) reported that 10 out of 11 monitored stars exhibited strong RV...
A Young Stellar Cluster Surrounding the Peculiar Eruptive Variable V838 Monocerotis (2006)
Afşar, Melike, Bond, Howard E.
The unusual variable star V838 Monocerotis underwent an eruption in 2002. It continues to illuminate a spectacular series of light echoes, as the outburst light is scattered from circumstellar dust....
Transiting extrasolar planetary candidates in the Galactic bulge (2006)
Sahu, Kailash C., Casertano, Stefano, Bond, Howard E., Valenti, Jeff, Smith, T. Ed, Minniti, Dante, ...
More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to the reflex motions of their host stars, and more recently...
Polaris: Mass and Multiplicity (2006)
Evans, Nancy Remage, Schaefer, Gail, Bond, Howard E., Nelan, Edmund, Bono, Giuseppe, Karovska, Margarita, ...
Polaris, the nearest and brightest classical Cepheid, is a member of at least a triple system. It has a wide ($18''$) physical companion, the F-type dwarf Polaris B. Polaris itself is a single-lined...
A Young Open Cluster Surrounding V838 Monocerotis (2006)
Bond, Howard E., Afsar, Melike
During a program of spectroscopic monitoring of V838 Mon, we serendipitously discovered that a neighboring 16th-mag star is of type B. We then carried out a spectroscopic survey of other stars in the...
Hubble Space Telescope Observations of the Light Echo around V838 Monocerotis (2006)
The outburst of V838 Monocerotis in early 2002, and the subsequent appearance of its light echoes, occurred just before the installation of the Advanced Camera for Surveys into the Hubble Space...
V838 Mon and M31-RV: The Stellar Populations Angle (2006)
Siegel, Michael H., Bond, Howard E.
Insight into the origin of unusual events like the eruption of V838 Mon can be obtained from studies of the stellar populations from which they arise. V838 Mon lies in an intriguing region of the...
Hubble Space Telescope Imaging of the Outburst Site of M31 RV (2005)
M31 RV is a luminous red variable star that appeared for several months in the bulge of M31 during 1988. Unlike classical novae, M31 RV was cool throughout its outburst. Interest in this object has...
Spectroscopic Binaries in Planetary Nebulae (2005)
It is already known that about 10% of central stars of PNe are very short-period binaries (hours to days), which are detected through photometric variations. These must have been formed through...
Hubble Space Telescope Spectroscopy of the Balmer lines in Sirius B (2005)
Barstow, M. A., Bond, Howard E., Holberg, J. B., Burleigh, M. R., Hubeny, I., Koester, D.
Sirius B is the nearest and brightest of all white dwarfs, but it is very difficult to observe at visible wavelengths due to the overwhelming scattered light contribution from Sirius A. However, from...
The uBVI Photometric System. I. Motivation, Implementation, and Calibration (2005)
This paper describes the design principles for a CCD-based photometric system that is highly optimized for ground-based measurement of the size of the Balmer jump in stellar energy distributions. It...
The uBVI Photometric System. II. Standard Stars (2005)
Siegel, Michael H., Bond, Howard E.
Paper I of this series described the design of a CCD-based photometric system that is optimized for ground-based measurements of the size of the Balmer discontinuity in stellar spectra. This "uBVI"...
Hubble Space Telescope spectroscopy of the Balmer lines in Sirius B (2005)
Barstow, Martin A., Bond, Howard E., Holberg, J.B., Burleigh, Matthew R., Hubeny, I., Koester, D.
A period and a prediction for the Of ? p spectrum alternator HD 191612 (2004)
Walborn, Nolan R., Howarth, Ian D., Rauw, Grégor, Lennon, Daniel J., Bond, Howard E., Negueruela, Ignacio, ...
The observational picture of the enigmatic O-type spectrum variable HD 191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 days has recently been...
A Period and a Prediction for the Of?p Spectrum Alternator HD 191612 (2004)
Walborn, Nolan R., Howarth, Ian D., Rauw, Gregor, Lennon, Daniel J., Bond, Howard E., Negueruela, Ignacio, ...
The observational picture of the enigmatic O-type spectrum variable HD191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 d has recently been...
Indications of a Large Fraction of Spectroscopic Binaries Among Nuclei of Planetary Nebulae (2003)
De Marco, Orsola, Bond, Howard E., Harmer, Dianne, Fleming, Andrew J.
Previous work indicates that about 10% of planetary-nebula nuclei (PNNi) are photometrically variable short-period binaries with periods of hours to a few days. These systems have most likely...
An energetic stellar outburst accompanied by circumstellar light echoes (2003)
Bond, Howard E., Henden, Arne, Levay, Zoltan G., Panagia, Nino, Sparks, William B., Starrfield, Sumner, ...
Some classes of stars, including supernovae and novae, undergo explosive outbursts that eject stellar material into space. In 2002, the previously unknown variable star V838 Monocerotis brightened...
WeBo 1: A Young Barium Star Surrounded by a Ring-Like Planetary Nebula (2002)
Bond, Howard E., Pollacco, Don L., Webbink, Ronald F.
WeBo 1 (PN G135.6+01.0), a previously unrecognized planetary nebula with a remarkable thin-ring morphology, was discovered serendipitously on Digitized Sky Survey images. The central star is found to...
Confirmation of SBS 1150+599A As An Extremely Metal-Poor Planetary Nebula (2002)
Jacoby, George, Feldmeier, John, Claver, Charles F., Garnavich, Peter M., Noriega-Crespo, Alberto, Bond, Howard E., ...
SBS 1150+599A is a blue stellar object at high galactic latitude discovered in the Second Byurakan Survey. New high-resolution images of SBS 1150+599A are presented, demonstrating that it is very...
FIRST J102347.6+003841: The First Radio-Selected Cataclysmic Variable (2002)
Bond, Howard E., White, Richard L., Becker, Robert H., O'Brien, M. Sean
We have identified the 1.4 GHz radio source FIRST J102347.6+003841 (hereafter FIRST J1023+0038) with a previously unknown 17th-mag Galactic cataclysmic variable (CV). The optical spectrum resembles...
Hubble Space Telescope Spectroscopy of V471 Tauri: Oversized K Star, Paradoxical White Dwarf (2001)
O'Brien, M. Sean, Bond, Howard E., Sion, Edward M.
We have used the GHRS onboard the HST to obtain Lyman-alpha spectra of the hot white-dwarf (WD) component of the short-period eclipsing DA+dK2 pre-cataclysmic binary V471 Tauri, a member of the...
Detection of Coronal Mass Ejections in V471 Tauri with the Hubble Space Telescope (2001)
Bond, Howard E., Mullan, D. J., O'Brien, M. Sean, Sion, Edward M.
V471 Tauri, an eclipsing system consisting of a hot DA white dwarf (WD) and a dK2 companion in a 12.5-hour orbit, is the prototype of the pre-cataclysmic binaries. The late-type component is...
Post-AGB Stars in Globular Clusters and Galactic Halos (2001)
Bond, Howard E., Alves, David R.
We discuss three aspects of post-AGB (PAGB) stars in old populations. (1) HST photometry of the nucleus of the planetary nebula (PN) K 648 in the globular cluster (GC) M15 implies a mass of 0.60...
Resolving Sirius-like binaries with the Hubble Space Telescope (2000)
Barstow, M. A., Bond, Howard E., Burleigh, M. R., Holberg, J. B.
We present initial results from a Hubble Space Telescope ultraviolet imaging survey of stars known to have hot white-dwarf companions which are unresolved from the ground. The hot companions,...
Resolving Sirius-like binaries with the Hubble Space Telescope (2000)
Burleigh, Matt, Barstow, Martin, Bond, Howard E., Holberg, Jay
We have imaged seventeen recently discovered Sirius-like binary systems with HST/WFPC2 and resolved the white dwarf secondary in eight cases. Most of the implied orbital periods are of order several...
Hubble Space Telescope Observations of the Planetary Nebula K648 in the Globular Cluster M15 (2000)
Alves, David R., Bond, Howard E., Livio, Mario
We have obtained observations of the planetary nebula K648 in the Galactic globular cluster M15 with the Hubble Space Telescope's WFPC2 camera, covering an interval of 7 days. The frames provide both...
Binarity of Central Stars of Planetary Nebulae (1999)
I list the 16 planetary nebulae (PNe) known to contain close-binary nuclei, and show that the nebulae generally have axisymmetric structures, including elliptical, bipolar, or ring morphologies. The...
A Hubble Space Telescope Survey for Resolved Companions of Planetary-Nebula Nuclei (1999)
Ciardullo, Robin, Bond, Howard E., Sipior, Michael S., Fullton, Laura K., Schaefer, Karen G.
We report results of an HST "snapshot" survey aimed at finding resolved binary companions of the central stars of Galactic planetary nebulae (PNe). Using WF/PC and WFPC2, we searched the fields of...
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...
Observations of GRB 970228 and GRB 970508, and the Neutron-Star Merger Model (1997)
Sahu, Kailash C., Livio, Mario, Petro, Larry, Bond, Howard E., Macchetto, F. Duccio, Galama, Titus J., ...
We present the discovery observations for the optical counterpart of the $\gamma$-ray burster GRB 970508 and discuss its light curve in the context of the fireball model. We analyze the HST data for...
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...
Post-AGB Stars as Standard Extragalactic Candles (1997)
Stars evolving off the asymptotic giant branch and passing through spectral types F and A are excellent candidates for a new extragalactic candle. These post-AGB (PAGB) stars are the brightest...
Age Gradient and the Second Parameter Problem in the Galactic Halo (1996)
Richer, Harvey B., Harris, William E., Fahlman, Gregory G., Bell, Roger A., Bond, Howard E., Hesser, James E., ...
We establish a framework for determing absolute ages of Galactic globular clusters and then use these ages to investigate the age-metallicity and age-Galactocentric distance relations for the 36...
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...
Boone, Charles W., Harell, George S., Bond, Howard E.
Large-scale separation of mixtures of mammalian cells was obtained with the A-1X zonal centrifuge rotor and density gradients consisting of Ficoll dissolved in modified Eagle's MEM suspension-culture...
ISOLATION OF PLASMA MEMBRANE FRAGMENTS FROM HELA CELLS
Boone, Charles W., Ford, Lincoln E., Bond, Howard E., Stuart, Donald C., Lorenz, Dianne
A method for isolating plasma membrane fragments from HeLa cells is described. The procedure starts with the preparation of cell membrane "ghosts," obtained by gentle rupture of hypotonically swollen...