On the Balmer discontinuity of BIa supergiants

Details On the Balmer discontinuity of BIa supergiants On the Balmer discontinuity of BIa supergiants

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987crasb.305.1279z&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Ter

Physics

2

Balmer Series, Stellar Atmospheres, Stellar Temperature, Supergiant Stars, Stellar Gravitation, Stellar Models, Stellar Radiation

Scientific paper

Observed Balmer discontinuities of BIa supergiants, obtained in the Barbier-Chalonge-Divan system using 13-color photometry, are compared with those predicted using classical models of stellar atmospheres. The differences noted between observations and theory for beta = 1 are shown to be a function of the effective temperature. Radii of the supergiants are usually higher when the spectral type is later, suggesting that models of extended atmospheres may explain both the Balmer discontinuities of the supergiants and their far-UV flux distributions.

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