Models of alpha Centauri A and B with and without seismic constraints: time dependence of the mixing-length parameter

Details Models of alpha Centauri A and B with and without seismic constraints: time dependence of the mixing-length parameter Models of alpha Centauri A and B with and without seismic constraints: time dependence of the mixing-length parameter

2006-11-23

arxiv.org/abs/astro-ph/0611733v1

Mon.Not.Roy.Astron.Soc.374:1264-1270,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures, to be published in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.11218.x

The $\alpha$ Cen binary system is a well-known stellar system with very accurate observational constraints to structure of its component stars. In addition to the classical non-seismic constraints, there are also seismic constraints for the interior models of $\alpha$ Cen A and B. These two types of constraint give very different values for the age of the system. While we obtain 8.9 Gyr for the age of the system from the non-seismic constraints, the seismic constraints imply that the age is about 5.6-5.9 Gyr. There may be observational or theoretical reasons for this discrepancy, which can be found by careful consideration of similar stars. The $\alpha$ Cen binary system, with its solar type components, is also suitable for testing the stellar mass dependence of the mixing-length parameter for convection derived from the binaries of Hyades. The values of the mixing-length parameter for $\alpha$ Cen A and B are 2.10 and 1.90 for the non-seismic constraints. If we prioritize to the seismic constraints, we obtain 1.64 and 1.91 for $\alpha$ Cen A and B, respectively. By taking into account of these two contrasting cases for stellar mass dependence of the mixing-length parameter, we derive two expressions for its time dependence, which are also compatible with the mass dependence of the mixing-length parameter derived from the Hyades stars. For assessment, these expressions should be tested in other stellar systems and clusters.

Affiliated with

Also associated with

No associations

Rating

Models of alpha Centauri A and B with and without seismic constraints: time dependence of the mixing-length parameter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Models of alpha Centauri A and B with and without seismic constraints: time dependence of the mixing-length parameter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Models of alpha Centauri A and B with and without seismic constraints: time dependence of the mixing-length parameter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-699878