Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....57..437s&link_type=abstract
Astronomy and Astrophysics, vol. 57, no. 3, May 1977, p. 437-441. Research supported by the Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astrophysics
77
Helium, R Coronae Borealis Stars, Stellar Evolution, Stellar Structure, Asymptotic Giant Branch Stars, Red Giant Stars, Secular Variations, Stellar Atmospheres, Stellar Envelopes, Stellar Mass, Stellar Spectra, White Dwarf Stars
Scientific paper
Extremely hydrogen deficient stars (helium stars and R Coronae Borealis variables) are considered to be remnants of double shell source stars (of the asymptotic giant branch). The evolution of stars with a condensed C/O-core and a helium envelope is followed numerically from the red giant stage to the white dwarf domain, crossing the regions of R CrB- and helium stars (so far analyzed). The time for crossing the helium star domain is some 1000 years. The corresponding times in the R CrB-region amounts up to several tens of thousands of years. It is possible that the helium stars are the precursors of helium rich white dwarfs. As a consequence, a significant fraction of all stars which end their lives as white dwarfs should pass through the helium star phase.
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