K Giants in Baade's Window. I. Velocity and Line-strength Measurements

Details K Giants in Baade's Window. I. Velocity and Line-strength Measurements K Giants in Baade's Window. I. Velocity and Line-strength Measurements

1995-08-23

arxiv.org/abs/astro-ph/9508105v1

Astronomy and Astrophysics

Astrophysics

Accepted by the Astronomical Journal. 58 pages, uuencoded compressed PostScript. A complete (text+figs) compressed PostScript

Scientific paper

10.1086/117649

This 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.

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