Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-14T08:03:59.415Z Has data issue: false hasContentIssue false
  • English
  • Français

Stellar evolution models with mass loss and turbulence

Published online by Cambridge University Press:  01 April 2008

M. Vick ,
G. Michaud  and
O. Richard
M. Vick
Affiliation:
Département de Physique, Université de Montréal, Montréal, PQ, H3C 3J7 email: mathieu.vick@umontreal.ca, michaudg@astro.umontreal.ca GRAAL, Université Montpellier II, CNRS, Place E. Bataillon, 34095 Montpellier Cedex, France email: Olivier.Richard@graal.univ-montp2.fr
G. Michaud
Affiliation:
Département de Physique, Université de Montréal, Montréal, PQ, H3C 3J7 email: mathieu.vick@umontreal.ca, michaudg@astro.umontreal.ca
O. Richard
Affiliation:
GRAAL, Université Montpellier II, CNRS, Place E. Bataillon, 34095 Montpellier Cedex, France email: Olivier.Richard@graal.univ-montp2.fr
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.

Although chemical separation is generally accepted as the main physical process responsible for the anomalous surface abundances of AmFm stars, its exact behavior within the interior of these stars is still uncertain. We will explore two hydrodynamical processes which could compete with atomic diffusion: mass loss and turbulence. We will also discuss the extent to which separation occurs immediately below the surface convection zone as well as the extent to which separation occurs below 200,000 K. To do so, self-consistent stellar models with mass loss and turbulence where calculated using the Montreal stellar evolution code and compared to observations of A and F stars. It is shown that to the precision of observations available for F stars, a mass loss rate of 2×10−14M⊙ · yr−1, is compatible with observations and that no turbulence is then required.

Keywords

stars: evolutionstars: abundancesstars: mass lossturbulence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 289 - 295
Copyright
Copyright © International Astronomical Union 2008

References

Alecian, G. 1996, A&A, 310, 872Google Scholar
Cayrel, R., Burkhart, C., & Van't Veer, C. 1991, in IAU Symposium 145, ed. Michaud, G. & Tutukov, A.CrossRefGoogle Scholar
Charbonneau, P. 1993, ApJ, 405, 720CrossRefGoogle Scholar
Gonzalez, J.-F., LeBlanc, F., Artru, M.-C., & Michaud, G. 1995, ApJ, 297, 223Google Scholar
Hui-Bon-Hoa, A. 2000, A&AS, 144, 203Google Scholar
Iglesias, C. A. & Rogers, F. 1996, ApJ, 464, 943CrossRefGoogle Scholar
Kato, S. 1966, PASP, 18, 374Google Scholar
Korn, A. J., Grundahl, F., Richard, O., Barklem, P. S., Mashonkina, L., Collet, R., Piskunov, N., & Gustafsson, B. 2006, Nature, 442, 657CrossRefGoogle Scholar
Krishna-Swamy, K. S. 1966, ApJ, 145, 176CrossRefGoogle Scholar
Langer, N., El Eid, M. F., & Fricke, K. J. 1985, A&A, 145, 179Google Scholar
LeBlanc, F., Michaud, G., & Richer, J. 2000, ApJ, 538, 876CrossRefGoogle Scholar
Leblanc, F., & Alecian, G. 2008, A&A, 477, 243Google Scholar
Maeder, A. 1997, A&A, 321, 134Google Scholar
Michaud, G., Tarasick, D., Charland, Y., & Pelletier, C. 1983, ApJ, 269, 239CrossRefGoogle Scholar
Michaud, G. & Charland, Y. 1986, ApJ, 311, 326CrossRefGoogle Scholar
Michaud, G., Richer, J., & Richard, O. 2007, ApJ, 670, 1178CrossRefGoogle Scholar
Michaud, G., Richer, J., & Richard, O. 2008, ApJ, 675, 1223CrossRefGoogle Scholar
Monier, R. 2005, A&A, 442, 563Google Scholar
Paquette, C., Pelletier, C., Fontaine, G., & Michaud, G. 1986, ApJS, 61, 177CrossRefGoogle Scholar
Preston, G. W. 1974, ARAA, 12, 257CrossRefGoogle Scholar
Richard, O., Michaud, G., & Richer, J. 2001, ApJ, 558, 377CrossRefGoogle Scholar
Richard, O., Michaud, G., & Richer, J. 2005, ApJ, 619, 538CrossRefGoogle Scholar
Richer, J., Michaud, G., Rogers, F., Turcotte, S., & Iglesias, C. A. 1998, ApJ, 492, 833CrossRefGoogle Scholar
Richer, J., Michaud, G., & Turcotte, S. 2000, ApJ, 529, 338CrossRefGoogle Scholar
Turcotte, S., Michaud, G., & Richer, J. 1998a, ApJ, 504, 559CrossRefGoogle Scholar
Turcotte, S., Richer, J., Michaud, G., Iglesias, C. A., & Rogers, F. 1998b, ApJ, 504, 539CrossRefGoogle Scholar
van't Veer-Menneret, C. & Mégessier, C. 1996, A&A, 309, 879Google Scholar