Astronomy and Astrophysics – Astronomy
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mmsai..46..271d&link_type=abstract
Società Astronomica Italiana, Memorie, vol. 46, May 1975, p. 271-275.
Astronomy and Astrophysics
Astronomy
Atmospheric Composition, Stellar Atmospheres, Stellar Evolution, Stellar Structure, White Dwarf Stars, Astronomical Models, Helium, Hertzsprung-Russell Diagram, Hydrogen, Stellar Envelopes, Temperature Distribution
Scientific paper
Evolutionary sequences for a helium white dwarf of 0.45 solar mass with different chemical compositions of the external layers have been computed. The loci of equal central temperature are shown in the H-R diagram. Variations of about 0.05 in the logarithm of luminosity and of about 0.03 in the logarithm of effective temperature are found for models with the same central temperature and pure-helium or hydrogen-risk external layers constituting 2 per cent of the total mass. It is concluded that mixing of a surface hydrogen layer with the helium core, due to the sinking of convection at low effective temperatures, cannot be studied by means of static models.
Dantona F.
Mazzitelli Irene
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