Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..227m&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 227-230 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
B Stars, Main Sequence Stars, Stellar Winds, Ultraviolet Spectra, Carbon, Galactic Clusters, Interstellar Extinction, Iue, O Stars, Open Clusters, Stellar Composition
Scientific paper
Low resolution IUE observations of BO-2V stars in several young open clusters were obtained as part of a poject to derive the UV extinction to the clusters. The aim was to use the extinction found from the B stars to deredden the cluster O stars. In the process, it became obvious that the BO-2V stars in the nuclear cluster of Sco OB1, NGC 6231, had very unusual UV spectra. A high dispersion IUE spectrum of one of the peculiar NGC 6231 B stars, BD-41 (deg) 7719, was obtained. The data indicate a mass loss rate which is much larger than normal B1V's. Some likely causes for the stron B star winds are considered. It is concluded that the peculiar spectra of the main sequence B stars in NGC 6231 are the result of an overabundance of carbon (and possibly other elements) in their atmospheres. Quantitative analysis shows that an enhancement of about 3 to 5 times solar is sufficient to explain the observations.
Massa Derck
Savage Blair. D.
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