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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 | | Affiliation: | Ohio State), E. M. Sadler (University of Sydney), and R. M. Rich (Columbia University | | Abstract: | 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. | | Source: | arXiv, astro-ph/9508105 | | Services: | Forum | Review | PDF | Favorites | |
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