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28 October 2021
  » arxiv » astro-ph/9508105

 Article overview

K Giants in Baade's Window. I. Velocity and Line-strength Measurements
D. M. Terndrup ; E. M. Sadler ; R. M. Rich ;
Date 23 Aug 1995
Subject astro-ph
AffiliationOhio State), E. M. Sadler (University of Sydney), and R. M. Rich (Columbia University
AbstractThis is the first in a series of papers in which we analyze medium--resolution spectra of over 400 K and M giants in Baade’s Window. Our sample was selected from the proper motion study of Spaenhauer et al. [AJ, 103, 297 (1992)]. We have measured radial velocities for most of the sample, as well as line--strength indices on the system of Faber et al. [ApJS, 57, 711 (1985)]. We analyze the random and systematic errors in velocities and line strengths, and show that the bright (V < 16.0) stars in our sample are predominantly foreground disk stars along the line--of--sight toward Baade’s Window. We find that most of the bulge K giants have stronger Mg absorption at a given color than do stars in the solar neighborhood. If the K giants in our sample are moderately old, we suggest that on average they may have [Mg/Fe] ~ +0.3, consistent with the results of recent high--resolution spectroscopy in Baade’s Window.
Source arXiv, astro-ph/9508105
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