Fine analysis of three R Coronae Borealis stars

Details Fine analysis of three R Coronae Borealis stars Fine analysis of three R Coronae Borealis stars

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....44..383s&link_type=abstract

Astronomy and Astrophysics, vol. 44, no. 2, Nov. 1975, p. 383-388.

Astronomy and Astrophysics

Astrophysics

81

R Coronae Borealis Stars, Solar Corona, Stellar Atmospheres, Stellar Evolution, Abundance, Atmospheric Models, Atmospheric Temperature, Stellar Gravitation, Stellar Luminosity, Stellar Mass

Scientific paper

Coarse analyses of the R Coronae Borealis stars R CrB, RY Sgr, and XX Cham are rechecked with model-atmosphere techniques in order to obtain reliable values of effective temperatures and gravities. The analyses have been performed with a grid of constant-flux-continuum model atmospheres with varying effective temperature, log g, and helium and carbon abundances. The abundances appear to be the same as for (extreme) helium stars; the hydrogen content is 0.0001 or less, carbon is the most abundant element after helium, the metals have approximately solar abundances. The positions in the (gravity, temperature)-plane of three analyzed objects match computed tracks of (extreme) helium stars. From this, the masses and luminosities of R CrB stars can be inferred. The conclusion is drawn that the R CrB stars are cool members of the class of (extreme) helium stars. Their evolution is discussed.

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