Degenerate stars with helium atmospheres

Details Degenerate stars with helium atmospheres Degenerate stars with helium atmospheres

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..524g&link_type=abstract

Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 1, p. 524-532.

Astronomy and Astrophysics

Astrophysics

34

Helium, Hydrogen, Stellar Atmospheres, Stellar Models, Stellar Spectrophotometry, Ubv Spectra, Abundance, Atmospheric Models, Color-Color Diagram, Colorimetry

Scientific paper

The multichannel photometry of degenerate stars shows that, within a limited, critical region of the G - R, U - B color-color diagram, essentially all have atmospheres with high He/H ratios. The hotter members of this group have the strongest He I lines. The DB classification applies to stars from 13,000 or 15,000 K up to 22,000 or 25,000 K, calibrating G - R colors by the model atmospheres. The stars have less negative U - B than the models. At the lower temperature limit the transition to line-free DC spectra occurs abruptly. However, three stars show Ca II lines, although hotter than most DC's. The metal/helium content is therefore an additional variable. A preliminary interpretation is given in terms of the competition between accretion, gravitational diffusive separation, and shallow or deep convection.

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