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To Be or Not To Be: Very Young Globular Clusters in M31
Judith G. Cohen, Keith Matthews, P. Brian Cameron
We present observations made with the newly commissioned Keck laser-guide star adaptive optics system of 6 objects in M31 that are alleged in multiple recent studies to be young gl…
The Frequency of Carbon Stars Among Extremely Metal-Poor Stars
Judith G. Cohen, Stephen Shectman, Ian Thompson +6
We demonstrate that there are systematic scale errors in the [Fe/H] values determined by the Hamburg/ESO Survey (and by inference by the HK Survey in the past) for certain extremel…
The Frequency of Carbon Rich Stars Among Extremely Metal Poor Stars
Judith G. Cohen, Stephen Shectman, Ian Thompson +6
We demonstrate that there are systematic scale errors in the [Fe/H] values determined by the Hamburg/ESO Survey (and by the HK Survey by inference) for certain extremely metal poor…
C and N Abundances in Stars At the Base of the Red Giant Branch in M15
Judith G. Cohen, Michael M. Briley, Peter B. Stetson
We present an analysis of a large sample of moderate resolution Keck LRIS spectra of subgiants and stars at the base of the RGB in M15, most within the range 16.5 < V < 19.5 (1.2 <…
Analysis of the carbon-rich very metal-poor dwarf G77-61
Bertrand Plez, Judith G. Cohen
We present an analysis of the carbon dwarf G77-61, a known binary, based on high resolution Keck spectra. G77-61 has a very-low metallicity, although not as extreme as what was pre…