Luminosities, masses, and ages of B-type stars

Details Luminosities, masses, and ages of B-type stars Luminosities, masses, and ages of B-type stars

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1994w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Dec. 1990, p. 1994-2003.

Astronomy and Astrophysics

Astronomy

9

Astronomical Photometry, B Stars, H Gamma Line, Stellar Luminosity, Stellar Mass, Atmospheric Models, Balmer Series, Main Sequence Stars, Stellar Atmospheres

Scientific paper

Measurements of H-gamma lines and photometry of the Balmer discontinuity are combined with models of stellar atmospheres and interiors to derive values of T(eff) log g, mass, and M(bol) for main-sequence B-type stars in the Alpha Per and the Pleiades clusters and in the Orion, Sco-Gen, and I Lac associations. The masses as a function of T(eff) agree with the analyses of eclipsing binary orbits. The luminosities yield distances for the observed clusters and associations that are in good agreement with independent determinations. The observed main sequence is broader than predicted by standard models and suggests that mixing may play a role in extending the main-sequence lifetime. Stars within each cluster and association show a range of ages, a result that suggests that star formation occurred over a period of at least 1-3 x 10 to the 7th yr.

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