Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-25T18:57:57.352Z Has data issue: false hasContentIssue false
  • English
  • Français

The age of the Galaxy's thick disk

Published online by Cambridge University Press:  01 October 2008

Sofia Feltzing  and
Thomas Bensby
Sofia Feltzing
Affiliation:
Lund Observatory, Box 43, SE-22100, Lund, Sweden email: sofia@astro.lu.se
Thomas Bensby
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago, Chile email: tbensby@eso.org
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We discuss the age of the stellar disks in the solar neighborhood. After reviewing the various methods for age dating, we discuss current estimates of the ages of both the thin- and the thick disks. We present preliminary results for kinematically-selected stars that belong to the thin- as well as the thick disk. All of these dwarf and sub-giant stars have been studied spectroscopically and we have derived both elemental abundances as well as ages for them. A general conclusion is that in the solar neighborhood, on average, the thick disk is older than the thin disk. However, we caution that the exclusion of stars with effective temperatures around 6500 K might result in a biased view of the full age distribution for the stars in the thick disk.

Keywords

Galaxy: structureGalaxy: diskkinematics and dynamicssolar neighborhoodHertzsprung-Russell diagramstars: late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S258: The Ages of Stars , October 2008 , pp. 23 - 30
Copyright
Copyright © International Astronomical Union 2009

References

Árnadottír, A. S., Feltzing, S., & Lundström, I. 2008, ArXiv:0807.1665Google Scholar
Barnes, S. A. 2009, these proceedingsGoogle Scholar
Barnes, S. A. 2007, ApJ, 669, 1167CrossRefGoogle Scholar
Bensby, T., Feltzing, S., & Lundström, I. 2003, A&A, 410, 527Google Scholar
Bensby, T., Feltzing, S., Lundström, I., & Ilyin, I. 2005, A&A, 433, 185Google Scholar
Bernkopf, J. & Fuhrmann, K. 2006, MNRAS, 369, 673CrossRefGoogle Scholar
del Peloso, E. F., da Silva, L., Porto de Mello, G. F., & Arany-prado, L. I. 2005, A&A, 440, 1153Google Scholar
Feltzing, S. & Bensby, T. 2008, arXiv: 0811.1777Google Scholar
Fuhrmann, K. 2008, MNRAS, 384, 173CrossRefGoogle Scholar
Gilmore, G., Wyse, R. F. G., & Jones, J. B. 1995, AJ, 109, 1095CrossRefGoogle Scholar
Gilmore, G., Wyse, R. F. G., & Norris, J. E. 2002, ApJ, 574, L39CrossRefGoogle Scholar
Grundahl, F., Clausen, J. V., Hardis, S., & Frandsen, S. 2008, arXiv:0810.2407GGoogle Scholar
Holmberg, J., Nordström, B., & Andersen, J. 2007, A&A, 475, 519Google Scholar
Jønch-Sørensen, H. 1995, A&A, 298, 799Google Scholar
Jørgensen, B. R. & Lindegren, L. 2005, A&A, 436, 127Google Scholar
Knox, R. A., Hawkins, M. R. S., & Hambly, N. C. 1999, MNRAS, 306, 736CrossRefGoogle Scholar
Leggett, S. K., Ruiz, M. T., & Bergeron, P. 1998, ApJ, 497, 294CrossRefGoogle Scholar
Mamajek, E. E. 2009, these proceedingsGoogle Scholar
Mamajek, E. E. & Hillenbrand, L. A. 2008, ApJ, 687, 1264CrossRefGoogle Scholar
Oswalt, T. D., Smith, J. A., Wood, M. A., & Hintzem, P. 1995, Nature, 382, 692CrossRefGoogle Scholar
Reddy, B. E., Lambert, D. L., & Allende Prieto, C. 2006, MNRAS, 367, 1329CrossRefGoogle Scholar
Sandage, A., Lubin, L. M., & VandenBerg, D. A. 2003, PASP, 115, 1187CrossRefGoogle Scholar
Schuster, W. J., Moitinho, A., Márquez, A., Parrao, L., & Covarrubias, E. 2006, A&A, 445, 939Google Scholar
Vauclair, S., Laymand, M., Bouchy, F., Vauclair, G., Bon Hoa, A. H., Charpinet, S., & Bazot, M. 2008, A&A, 482, L5Google Scholar
von Hippel, T. & Bothun, G. D. 1993, ApJ, 407, 115CrossRefGoogle Scholar
Wyse, R. F. G., Gilmore, G., Norris, J. E., Wilkinson, M. I., Kleyna, J. T., Koch, A., Evans, N. W., & Grebel, E. 2006, ApJ, 639, L13CrossRefGoogle Scholar