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Issue A&A
Volume 406, Number 2, August I 2003
Page(s) 623 - 628
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030690



A&A 406, 623-628 (2003)
DOI: 10.1051/0004-6361:20030690

Studies on stellar rotation

III. An improvement of the treatment of the brightening distribution of rotating and tidally distorted stars
A. Claret

Instituto de Astrofísica de Andalucía, CSIC, Apartado 3004, 18080 Granada, Spain
(Received 17 March 2003 / Accepted 16 April 2003)

Abstract
We have computed new values of the gravity-darkening exponents  $\beta_1$ (GDE) incorporating the interior-atmosphere coupling by combining our method developed previously and the properties of modern atmosphere models. The mass range where this coupling is applied is extended in the present work from 0.08 to 40  $M_{\odot}$. The effects of the alternative theories of convective transport of energy on GDEs is also investigated. These new values of GDEs are compared to recent observations and we found a good agreement, mainly at the crucial transition phase.

In addition, the gravity-darkening coefficients  y were computed for the u v b y U B V R I J H K  passbands using recent atmosphere models instead of the black body approximation. All this information is made available in the form of tables and can be obtained from EDP Sciences, or for specific calculations, directly from the author.


Key words: stars: fundamental parameters -- stars: binaries: close -- stars: evolution -- stars: rotation

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