Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4304m&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #43.04; Bulletin of the American Astronomical Society, Vol. 29, p.1275
Astronomy and Astrophysics
Astronomy
Scientific paper
I will present new HST GHRS observations of the extraordinary stellar winds of the main sequence B stars in NGC 6231. IUE observations have shown that, unlike all normal main sequence B stars, the early B main sequence stars in the core of NGC 6231 all have well developed C iv lambda lambda 1550 wind lines (Massa, Savage, & Cassinelli 1984, ApJ, 284, 437). Perhaps even more perplexing, is that the wind line profiles cannot be fit using normal velocity laws for the wind acceleration. One means of resolving this dilemma is to assume that the wind law for the NGC 6231 B stars is normal, but that it accelerates toward a terminal velocity which is much higher than the observed one. However, before the wind can attain its ``actual'' terminal velocity, it shocks and subsequently ``stalls'' at the observed terminal velocity. Such behavior is predicted by radiatively driven stellar wind theory for stars with weak winds (Springmann & Pauldrach 1994, A&A, 262, 515). The new HST observations test some consequences of this conjecture.
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