An, Deokkeun, Pinsonneault, Marc H., Masseron, Thomas, Delahaye, Franck, Johnson, Jennifer A., Terndrup, Donald M., ...
We perform an extensive test of theoretical stellar models for main-sequence stars in ugriz, using cluster fiducial sequences obtained in the previous paper of this series. We generate a set of...
Sneden, Christopher, Lawler, James E., Cowan, John J., Ivans, Inese I., Hartog, Elizabeth A. Den
We have derived new abundances of the rare-earth elements Pr, Dy, Tm, Yb, and Lu for the solar photosphere and for five very metal-poor, neutron-capture r-process-rich giant stars. The photospheric...
An, Deokkeun, Johnson, Jennifer A., Clem, James L., Yanny, Brian, Rockosi, Constance M., Morrison, Heather L., ...
We present photometry for globular and open cluster stars observed with the Sloan Digital Sky Survey (SDSS). In order to exploit over 100 million stellar objects with r < 22.5 mag observed by SDSS,...
Allende Prieto, Carlos, Sivarani, Thirupathi, Beers, Timothy C., Lee, Young Sun, Koesterke, Lars, Shetrone, Matthew, ...
We report high-resolution spectroscopy of 125 field stars previously observed as part of the Sloan Digital Sky Survey and its program for Galactic studies, the Sloan Extension for Galactic...
CS22964-161: A Double-Lined Carbon- and s-Process-Enhanced Metal-Poor Binary Star (2007)
Thompson, Ian B., Ivans, Inese I., Bisterzo, Sara, Sneden, Christopher, Gallino, Roberto, Vauclair, Sylvie, ...
A detailed high-resolution spectroscopic analysis is presented for the carbon-rich low metallicity Galactic halo object CS 22964-161. We have discovered that CS 22964-161 is a double-lined...
Edward L. Robinson, Inese I. Ivans, William F. Welsh
We obtained high dispersion spectroscopy of CI Cam, the optical counterpart of XTE J0421+560, two weeks after the peak of its short outburst in 1998 April. The optical counterpart is a supergiant...
Near-UV Observations of HD221170: New Insights into the Nature of r-Process-Rich Stars (2006)
Ivans, Inese I., Simmerer, Jennifer, Sneden, Christopher, Lawler, James E., Cowan, John J., Gallino, Roberto, ...
Employing high resolution spectra obtained with the near-UV sensitive detector on the Keck I HIRES, supplemented by data obtained with the McDonald Observatory 2-d coude, we have performed a...
Chemical Compositions of Red Giant Stars in Old Large Magellanic Cloud Globular Clusters (2005)
Johnson, Jennifer A., Ivans, Inese I., Stetson, Peter B.
We have observed ten red giant stars in four old Large Magellanic Cloud globular clusters with the high-resolution spectrograph MIKE on the Magellan Landon Clay 6.5-m telescope. The stars in our...
Ivans, Inese I., Sneden, Christopher, Gallino, Roberto, Cowan, John J., Preston, George W.
Employing spectra obtained with the new Keck I HIRES near-UV sensitive detector, we have performed a comprehensive chemical composition analysis of the binary blue metal-poor star CS29497-030....
Magnesium isotopic abundance ratios in cool stars (2003)
Yong, David, Lambert, David L., Ivans, Inese I.
From high resolution spectra of 61 cool dwarfs and giants, Mg isotopic abundance ratios 24Mg:25Mg:26Mg are derived from spectral synthesis of the MgH A-X lines near 5140A. Our sample spans the range...
A Comparison of Copper Abundances in Globular Cluster and Halo Field Giant Stars (2003)
Simmerer, Jennifer, Sneden, Christopher, Ivans, Inese I., Kraft, Robert P., Shetrone, Matthew D., Smith, Verne V.
We derive [Cu/Fe] for 117 giant stars in ten globular clusters (M3, M4, M5, M10, M13, M15, M71, NGC 7006, NCG 288, and NGC 362) and find that globular cluster Cu abundances appear to follow [Cu/Fe]...
A Globular Cluster Metallicity Scale Based on the Abundance of Fe II (2002)
Kraft, Robert P., Ivans, Inese I.
Assuming that in the atmospheres of low-mass, metal-poor red giant stars, 1-D models based on LTE accurately predict the abundance of iron from Fe II, we derive a globular cluster metallicity scale...
The Chemical Composition and Age of the Metal-Poor Halo Star BD +17^\circ 3248 (2002)
Cowan, John J., Sneden, Christopher, Burles, Scott, Ivans, Inese I., Beers, Timothy C., Truran, James W., ...
We have combined new high-resolution spectra obtained with the Hubble Space Telescope (HST) and ground-based facilities to make a comprehensive new abundance analysis of the metal-poor, halo star BD...
High-Dispersion Spectroscopy of the X-Ray Transient RXTE J0421+560 (= CI Cam) during Outburst (2001)
Robinson, Edward L., Ivans, Inese I., Welsh, William F.
We obtained high dispersion spectra of CI Cam, the optical counterpart of XTE J0421+560, two weeks after the peak of its short outburst in 1998 April. The optical counterpart is a supergiant B[e]...
Chemical Abundance Variations in Globular Clusters: Recent Results from Mildly Metal-Poor M5 (2001)
Ivans, Inese I., Kraft, Robert P., Sneden, Chris, Smith, Graeme H., Rich, R. Michael, Shetrone, Matthew
We present a chemical composition analysis of 36 giant stars in mildly metal-poor globular cluster M5. In comparing the M5 results to those obtained in M4, a cluster previously considered to be a...
Ivans, Inese I., Kraft, Robert P., Sneden, Christopher, Smith, Graeme H., Rich, R. Michael, Shetrone, Matthew
We present a chemical composition analysis of 36 giant stars in the mildly metal-poor globular cluster M5 (NGC 5904). The analysis makes use of high resolution data acquired at the Keck I telescope...
Lambert, David L., Rao, N. Kameswara, Pandey, Gajendra, Ivans, Inese I.
Infrared Space Observatory 3 - 25 $\mu$m spectra of the R Coronae Borealis stars V854 Cen, R CrB, and RY Sgr are presented and discussed. Sharp emission features coincident in wavelengths with the...
Galaxy Mergers: A Search for Chemical Signatures (2000)
Ivans, Inese I., Carney, Bruce, De Almeida, Luisa, Sneden, Chris
We have gathered high resolution echelle spectra for more than two dozen high-velocity metal-poor field stars, including BD+80 245, a star previously known to have extremely low [alpha/Fe]...
Evidence of Multiple r-Process Sites in the Early Galaxy: New Observations of CS 22892-052 (2000)
Sneden, Christopher, Cowan, John J., Ivans, Inese I., Fuller, George M., Burles, Scott, Beers, Timothy C., ...
First results are reported of a new abundance study of neutron-capture elements in the ultra-metal-poor (UMP; [Fe/H] = -3.1) halo field giant star CS 22892-052. Using new high resolution, high...
Do AGB Stars Differ Chemically from RGB Stars in Globular Clusters? (2000)
Sneden, Christopher, Ivans, Inese I., Kraft, Robert P.
Recent improvements in globular cluster colour-magnitude diagrams, coupled with an increase in large-sample spectroscopic abundance studies of cluster giants, finally allow some attempts at a...
A Search for Chemical Signatures of Galactic Mergers (1999)
Ivans, Inese I., Carney, Bruce, De Almeida, Luisa, Sneden, Chris
We present preliminary abundance analyses of a group of high-velocity metal-poor stars. This report describes our work in progress. We examine the derived abundances in the context of previous...
Chemical Abundances of Bright Giants in the Mildly Metal-Poor Globular Cluster M4 (1999)
We present a chemical composition analysis of three dozen giant stars in the nearby ``CN-bimodal'' mildly metal-poor ( = -1.18) globular cluster M4. The analysis combined traditional spectroscopic...
Ivans, Inese I., Sneden, Christopher, Kraft, Robert P., Suntzeff, Nicholas B., Smith, Verne V., Langer, G. Edward, ...
We present a chemical composition analysis of 36 giants in the nearby mildy metal-poor ( = -1.18) "CN-bimodal" globular cluster M4. Confronted with a cluster that has large and variable interstellar...