Mass loss from extreme helium stars

Details Mass loss from extreme helium stars Mass loss from extreme helium stars

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..273h&link_type=abstract

In ESA 3rd European IUE Conf. p 273-276 (SEE N83-11889 02-88)

Computer Science

B Stars, Stellar Atmospheres, Stellar Mass Ejection, Hertzsprung-Russell Diagram, Ionization Potentials, Iue, Line Spectra, Resonance Lines, Stellar Luminosity, Ultraviolet Spectra

Scientific paper

Indications of mass loss were found in the UV spectra of stars HD 160641, BD-9 4395 and BD+10 2179, obtained with IUE in high resolution. The observed ionization fractions were compared with warm, cool and corona models. Mass loss rates for the three stars were derived and compared with theoretical predictions as well as with empirical correlations established for early stars of normal composition. Mass loss rates for the helium stars have an order of magnitude similar to that of massive stars of similar luminosity. However, the mass loss must depend on a second parameter, radius or effective temperature, i.e., cooler stars have smaller mass loss. Because the extreme helium stars probably develop towards the left in the HR diagram, results imply that they also increase their mass loss with time.

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