Studies of the variability of Luminous Blue Variable stars.
Abstract
The photospheres and winds of Luminous Blue Variable stars (LBVs) are investigated using non-LTE unified model atmospheres. The key question addressed is whether increases in the mass-loss rate of LBV stars can account for the observed increases in stellar radii by factors 4 to 12. A high mass-loss might lead to the formation of so-called "pseudo photospheres", mimicing large radii. Several arguments, both observational and theoretical, are presented. They show that a variable mass-loss is not the cause of the observed radius changes. It is concluded that the mechanism responsible should act in sub-photospheric layers.
- Publication:
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Studies of the variability of Luminous Blue Variable stars
- Pub Date:
- September 1993
- Bibcode:
- 1993svlb.book.....D