Variability and mass loss in IA O-B-A supergiants

Details Variability and mass loss in IA O-B-A supergiants Variability and mass loss in IA O-B-A supergiants

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88...67s&link_type=abstract

Astronomical Journal, vol. 88, Jan. 1983, p. 67-71. Research supported by the Natural Sciences and Engineering Research Council

Astronomy and Astrophysics

Astronomy

12

A Stars, B Stars, Brightness Distribution, O Stars, Stellar Mass Ejection, Supergiant Stars, Variability, Balmer Series, Milky Way Galaxy, Radiant Flux Density, Southern Sky, Spectral Energy Distribution, Stellar Color, Stellar Spectrophotometry, Ubv Spectra

Scientific paper

Recently completed catalogs of MK spectral types and UBV photometry of 1227 OB stars in the southern Milky Way have been analyzed to investigate brightness and color variability among the Ia supergiants. It is found that brightness variability is common among the O9-B1 supergiants with typical amplitudes about 0.1 and time scales longer than a week and shorter than 1000 days. Among the A supergiants fluctuations in U-B color are found on similar time scales and with amplitude about 0.1. For many early Ia supergaints there is a poor correlation between Balmer jump and spectral type, as had been known previously. An attempt to correlate the Balmer jump deficiency with mass loss rate yielded uncertain results.

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