Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151..349v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 2, Oct. 1985, p. 349-360.
Astronomy and Astrophysics
Astrophysics
32
A Stars, B Stars, Light Curve, O Stars, Stellar Luminosity, Variable Stars, Early Stars, Hertzsprung-Russell Diagram, Interstellar Extinction, Stellar Oscillations, Stellar Spectrophotometry, Supergiant Stars, Ubv Spectra, X Ray Binaries
Scientific paper
In the present investigation of microvariations in six high luminosity O-type and two B-type stars, temperatures, gravities, and reddenings are determined with the aid of theoretical colors. At least six stars of this sample exhibit a periodic or quasi-periodic oscillation in the light curve, together with a second type of nonperiodic variation that is superimposed on the mean light and color curves. Large convective elements in these atmospheres having varying physical conditions are suggested as an at least partial explanation. Observations of the hottest stars suggest that even their photospheres are unstable against convection or that they pulsate, contrary to theoretical models.
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