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| Paper: |
Mass Loss in 2-D Stellar Models |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
74 |
| Authors: |
Lovekin, C. C. |
| Abstract: |
A large number of massive stars are known to rotate, resulting in significant distortion and variation in surface temperature from the pole to the equator. Radiatively driven mass loss is temperature dependent, so rapid rotation produces variation in mass loss and angular momentum loss rates across the surface of the star, which is expected to affect the evolution of rapidly rotating massive stars.
In this work, we investigate the two dimensional effects of rotation on radiatively driven mass loss and the associated loss of angular momentum in ZAMS models with solar metallicity.
Using 2-D stellar models, which give the variation in surface parameters as a function of co-latitude, we implement two different mass-loss prescriptions describing radiatively driven mass loss.
We find a significant variation in mass-loss rates and angular momentum loss as a function of co-latitude. We find that the mass-loss rate decreases as the rotation rate increases for models at constant initial mass and derive scaling relations based on these models. When comparing 2-D to 1-D mass-loss rates, we find that although the total angle integrated mass loss does not differ significantly, the 2-D models predict less mass loss from the equator and more mass loss from the pole than the 1-D predictions using von Zeipel's law. As a result, rotating models lose less angular momentum in 2-D than in 1-D, which will change the subsequent evolution of the star. |
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