2-dimensional models of rapidly rotating stars I. Uniformly rotating zero age main sequence stars - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2004

2-dimensional models of rapidly rotating stars I. Uniformly rotating zero age main sequence stars

(1, 2, 3)
1
2
3

Abstract

We present results for 2-dimensional models of rapidly rotating main sequence stars for the case where the angular velocity Omega is constant throughout the star. The algorithm used solves for the structure on equipotential surfaces and iteratively updates the total potential, solving Poisson's equation by Legendre polynomial decomposition; the algorithm can readily be extended to include rotation constant on cylinders. We show that this only requires a small number of Legendre polynomials to accurately represent the solution. We present results for models of homogeneous zero age main sequence stars of mass 1, 2, 5, 10 M&sun; with a range of angular velocities up to break up. The models have a composition X=0.70, Z=0.02 and were computed using the OPAL equation of state and OPAL/Alexander opacities, and a mixing length model of convection modified to include the effect of rotation. The models all show a decrease in luminosity L and polar radius Rp with increasing angular velocity, the magnitude of the decrease varying with mass but of the order of a few percent for rapid rotation, and an increase in equatorial radius Re. Due to the contribution of the gravitational multipole moments the parameter Omega2 Re3/GM can exceed unity in very rapidly rotating stars and Re/Rp can exceed 1.5.
Fichier principal
Vignette du fichier
aa1202.pdf (841.23 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-03796858 , version 1 (05-10-2022)

Identifiers

Cite

Ian W. Roxburgh. 2-dimensional models of rapidly rotating stars I. Uniformly rotating zero age main sequence stars. Astronomy and Astrophysics - A&A, 2004, 428, pp.171-179. ⟨10.1051/0004-6361:20041202⟩. ⟨hal-03796858⟩
26 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More