Extreme helium stars

Details Extreme helium stars Extreme helium stars

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981iraj...15...42l&link_type=abstract

(Astronomical Science Group of Ireland, Meeting, Dublin, Ireland, Dec. 19, 1980.) Irish Astronomical Journal, vol. 15, Mar. 1981

Astronomy and Astrophysics

Astronomy

1

Atmospheric Models, B Stars, Stellar Atmospheres, Stellar Evolution, Stellar Mass Ejection, Abundance, Hydrogen, R Coronae Borealis Stars, Stellar Envelopes, Stellar Spectra, Stellar Spectrophotometry

Scientific paper

Results of research into the nature of extreme helium stars are reviewed, covering published and unpublished work carried out over the past 20 years. Three approaches are being used to investigate the nature and evolution of extreme helium stars. Abundance analysis from model atmospheres provides information useful in interpreting the evolution of stars. Studies of amplitude variations in the optical light emitted from extreme helium stars often can yield information about the internal structures of the stars, and also are important because of the suggested evolutionary connection of extreme helium stars with R CrB stars. Mass-loss rate determinations are important because the presence of mass-loss is indicative of more dramatic mass-loss that may have resulted in the loss of the original hydrogen envelope.

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