O. Benomar, T. R. Bedding, D. Stello, S. Deheuvels, T. R. White, J. Christensen-Dalsgaard
Since few decades, asteroseismology, the study of stellar oscillations,
enables us to probe the interiors of stars with great precision. It allows
stringent tests of stellar models and can provide accurate radii, masses and
ages for individual stars. Of particular interest are the mixed modes that
occur in subgiant solar-like stars since they can place very strong constraints
on stellar ages. Here we measure the characteristics of the mixed modes,
particularly the coupling strength, using a grid of stellar models for stars
with masses between 0.9 and 1.5 M_{\odot}. We show that the coupling strength
of the $\ell = 1$ mixed modes is predominantly a function of stellar mass and
appears to be independent of metallicity. This should allow an accurate mass
evaluation, further increasing the usefulness of mixed modes in subgiants as
asteroseismic tools.
View original:
http://arxiv.org/abs/1201.1067
No comments:
Post a Comment