Impact of the new solar abundances on the calibration of the PMS binary system RS Cha

Details Impact of the new solar abundances on the calibration of the PMS binary system RS Cha Impact of the new solar abundances on the calibration of the PMS binary system RS Cha

2007-07-17

arxiv.org/abs/0707.2609v1

Astronomy and Astrophysics

Astrophysics

Research note accepted in A&A, 5 pages, 2 figures

Scientific paper

10.1051/0004-6361:20077332

Context: In a recent work, we tried to obtain a calibration of the two components of the pre-main sequence binary system RS Cha by means of theoretical stellar models. We found that the only way to reproduce the observational parameters of RS Cha with standard stellar models is to decrease the initial abundances of carbon and nitrogen derived from the GN93 solar mixture of heavy elements by a few tenths of dex. Aims: In this work, we aim to reproduce the observational properties of the RS Cha stars with stellar evolution models based on the new AGS05 solar mixture recently derived from a three-dimensional solar model atmosphere. The AGS05 mixture is depleted in carbon, nitrogen and oxygen with respect to the GN93 mixture. Methods: We calculated new stellar models of the RS Cha components using the AGS05 mixture and appropriate opacity tables. We sought models that simultaneously satisfy the observations of the two components (masses, radii, luminosities, effective temperatures and metallicity). Results: We find that it is possible to reproduce the observational data of the RS Cha stars with AGS05 models based on standard input physics. From these models, the initial helium content of the system is Y~0.255 and its age is ~9.13 +- 0.12 Myr.

Affiliated with

Also associated with

No associations

Rating

Impact of the new solar abundances on the calibration of the PMS binary system RS Cha 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 Impact of the new solar abundances on the calibration of the PMS binary system RS Cha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact of the new solar abundances on the calibration of the PMS binary system RS Cha will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-552873