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Remarks concerning the masses of horizontal-branch A stars

Published online by Cambridge University Press:  04 August 2017

A. G. Davis Philip ,
D. S. Hayes  and
Kristina D. Philip
A. G. Davis Philip
Affiliation:
Van Vleck Observatory and Union College
D. S. Hayes
Affiliation:
Kitt Peak National Observatory
Kristina D. Philip
Affiliation:
Van Vleck Observatory

Extract

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Studies are underway concerning the masses of horizontal-branch A stars. Hayes and Philip (1979) discussed masses determined for seven field HB stars using gravities and temperatures obtained from spectrophotometric scans. They found a mean mass of 0.6 M⊙ ± 0.4 for these stars. However, there was a strong trend of mass with temperature. In the present study four-color measures of over 150 FHB and BHB stars have been dereddened and plotted in the grid relating (b-y), c1 and log g, Teff (Philip and Relyea 1979). If one calculates a mean mass, again the figure of 0.6 M⊙ is obtained. A more detailed look at the data, however, reveals structure in the distribution of points in the various diagrams. A discussion of this result follows.

Type
I. EVOLUTION OF LOW AND INTERMEDIATE MASS STARS OBSERVATIONS AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 171 - 173
Copyright
Copyright © Reidel 1984 

References

Hayes, D. S. and Philip, A. G. D. 1979 PASP 91, 71.Google Scholar
Philip, A. G. D. and Relyea, L. J. 1979 Astron. J. 84, 1743.Google Scholar