| Type |
Journal Article |
| Names |
L. M. Oskinova, W.-R. Hamann, J. P. Cassinelli, J. C. Brown, H. Todt |
| Publication |
Astronomische Nachrichten |
| Volume |
332 |
| Issue |
9/10 |
| Pages |
988 |
| Date |
December 1, 2011 |
| URL |
http://adsabs.harvard.edu/abs/2011AN....332..988O |
| Library Catalog |
NASA ADS |
| Abstract |
We investigate the connections between the magnetic fields and the X-ray emission from massive stars. Our study shows that the X-ray properties of known strongly magnetic stars are diverse: while some comply to the predictions of the magnetically confined wind model, others do not. We conclude that strong, hard, and variable X-ray emission may be a sufficient attribute of magnetic massive stars, but it is not a necessary one. We address the general properties of X-ray emission from ``normal'' massive stars, especially the long standing mystery about the correlations between the parameters of X-ray emission and fundamental stellar properties. The recent development in stellar structure modeling shows that small-scale surface magnetic fields may be common. We suggest a ``hybrid'' scenario which could explain the X-ray emission from massive stars by a combination of magnetic mechanisms on the surface and shocks in the stellar wind. The magnetic mechanisms and the wind shocks are triggered by convective motions in sub-photospheric layers. This scenario opens the door for a natural explanation of the well established correlation between bolometric and X-ray luminosities. Based on observations obtained with \xmm and \cxo. |
| Tags |
Stars: Wolf-Rayet, Techniques: Spectroscopic, X-rays: stars, outflows, stars: magnetic fields, stars: mass-loss, stars: winds |