Studies of the Variability of Luminous Blue Variable Stars

Details Studies of the Variability of Luminous Blue Variable Stars Studies of the Variability of Luminous Blue Variable Stars

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt.......154d&link_type=abstract

Ph.D. Thesis, English, 230 pages. ISBN : 90-393-0048-8

Physics

Physical Data And Processes, Line: Formation, Line: Profiles, Radiative Transfer, Stars: Atmospheres, Stars: Early-Type, Stars: Evolution, Stars: Hertzsprung-Russel, Stars: Mass-Loss, Stars: Winds, Stars: Outflows

Scientific paper

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.

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