Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..22..199c&link_type=abstract
Astrophysics and Space Science, Volume 22, Issue 1, pp.199-211
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
After a short historical survey (Section 1), present available informations on the location of H.B. stars in the colour-magnitude diagram are collected. A general agreement is found between observations and theoretical predictions as deduced from the available B.C.- and (B-V)-logT e relations. It is shown that some peculiarities or differences in the shapes of the blue branch — if real — can be ascribed to differences in the He content and/or in the efficiency of gravitational sedimentation, whereas the discrepancies in the maximum colour index of red H.B. stars is perhaps related with present indeterminacy of the treatment of superadiabacity (Section 2). Finally (Section 3) a comparison among presently available evaluations of the B.C.-logT e and (B-V)-logT e relations is made in order to derive informations about the range of reliability, as well as in order to emphasize some possible peculiarities.
Caputo Filippina
Castellani Vittorio
Natta Antonella
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