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Bulge K and M giants

Published online by Cambridge University Press:  07 August 2017

Donald M. Terndrup
Donald M. Terndrup*
Affiliation:
Department of Astronomy, The Ohio State University, 174 W. 18th. Ave., Columbus, OH 43210 USA

Abstract

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Several independent studies of the abundances and kinematics of K and M giants in the inner Galaxy (R < 2 kpc) are assembled to trace out this region's global properties. The mean metal abundance is [M/H] ≈ +0.3 at R = 0.5 kpc, and declines by about 1.2 dex out to R = 2 kpc. The line-of-sight velocity dispersion at R = 0.5 kpc is σr ≈ 115 km sec—1 for all population tracers, and declines by d log σr /d log R = —0.4. It now seems fairly clear that only the most metal-poor K giants become RR Lyrae variables, while the more metal-rich ones become late M stars. There is some evidence that the most metal-rich stars are in a flatter, more rapidly rotating system. Metal abundance ratios for a few K giants suggest that the inner Galaxy may have formed rapidly.

Keywords

Galactic BulgeLate-type StarsMetallicity GradientsStellar Abundances
Type
Invited Reviews
Information
Symposium - International Astronomical Union , Volume 153: Galactic Bulges , 1993 , pp. 87 - 100
Copyright
Copyright © Kluwer 1993 

References

Baade, W. 1944, ApJ, 100, 137 CrossRefGoogle Scholar
Blanco, B. M. 1984, AJ, 89, 1836 CrossRefGoogle Scholar
Blanco, V. M. 1988, AJ, 95, 1400 Google Scholar
Blanco, V. M., McCarthy, M. F., & Blanco, B. M. 1984, AJ, 89, 636 Google Scholar
Blanco, V. M., & Terndrup, D. M. 1989, AJ, 98, 843 Google Scholar
Carr, J., DePoy, D., Frogel, J. A., Sellgren, K., & Terndrup, D. M. 1992, in preparation Google Scholar
Carney, B. W., Latham, D. W., & Laird, J. B. 1990, AJ, 99, 572 Google Scholar
Frenk, C. S., and White, S. D. M. 1980, MNRAS, 193, 295 CrossRefGoogle Scholar
Frogel, J. A., & Whitford, A. E. 1987, ApJ, 320, 199 Google Scholar
Frogel, J. A., Terndrup, D. M., Blanco, V. M., & Whitford, A. E. 1990, ApJ, 353, 494 CrossRefGoogle Scholar
Geisler, D., & Friel, E. D. 1992, AJ, 104, 128 Google Scholar
Gilmore, G., Wyse, R. F. G., & Kuijken, K., 1989, ARA&A, 27, 555 Google Scholar
Kent, S. M. 1992, ApJ, 387, 181 CrossRefGoogle Scholar
Kinman, T. D., Feast, M. W., & Lasker, B. M. 1988, AJ, 95, 804 Google Scholar
Lee, Y.-W. 1992, AJ, 104, 1780 Google Scholar
Lewis, J. R., & Freeman, K. C., 1989, AJ, 97, 139 CrossRefGoogle Scholar
McWilliam, A., & Rich, R. M., 1992, in preparation.Google Scholar
Menzies, J. W, 1990, in Bulges of Galaxies, eds. Jarvis, B. & Terndrup, D., ESO Conf. Ser., 35, 115 Google Scholar
Minniti, D., White, S. D. M., Olszewski, E. W., & Hill, J. M. 1992, ApJ, 393, L47 CrossRefGoogle Scholar
Oort, J., & Plaut, L. 1975, A&Ap, 41, 71 Google Scholar
Peterson, R. C., & Terndrup, D. M. 1992, in preparation Google Scholar
Peterson, R. C., Dalle Ore, C., & Kurucz, R. 1992, ApJ, in press Google Scholar
Rich, R. M. 1988, AJ, 95, 828 Google Scholar
Rich, R. M. 1990, ApJ, 362, 604 CrossRefGoogle Scholar
Rich, R. M., Sadler, E. M., & Terndrup, D. M. 1992, in preparation Google Scholar
Sharpies, R., Walker, A., & Cropper, M. 1990, MNRAS, 246, 54 Google Scholar
Spaenhauer, A., Jones, B. F., & Whitford, A. E. 1992, AJ, 103, 297 Google Scholar
Spite, M., & Spite, F. 1985, ARA&A, 23, 225 Google Scholar
Suntzeff, N. B., Kinman, T. D., & Kraft, R. P. 1991, ApJ, 367, 528 CrossRefGoogle Scholar
Terndrup, D.M. 1988, ApJ, 96, 884 Google Scholar
Terndrup, D. M., Frogel, J. A., & Whitford, A. E. 1990, ApJ, 357, 453 CrossRefGoogle Scholar
Terndrup, D. M., Frogel, J. A., & Whitford, A. E. 1991, ApJ, 378, 742 Google Scholar
Terndrup, D. M., Frogel, J. A., & Wells, L. A. 1992, in preparation Google Scholar
Tinsley, B M. 1980, Fund. Cosmic Phys., 5, 287 Google Scholar
Tyson, N. D. 1991, , Google Scholar
Walker, A. R., & Terndrup, D. M. 1991, ApJ, 378, 119 Google Scholar
Wheeler, J. C., Sneden, C., & Truran, J. W. 1989, ARA&A, 27, 279 Google Scholar
Whitford, A. E. & Rich, R. M. 1983, ApJ, 274, 723 Google Scholar
VandenBerg, D. A., & Laskarides, P. G. 1987, ApJS, 64, 103 Google Scholar