Electronic Resource
Springer
Astrophysics and space science
22 (1973), S. 199-211
ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00642834
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