Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-23T19:43:34.222Z Has data issue: false hasContentIssue false
  • English
  • Français

RR Lyrae AND BL Herculis Variables

Published online by Cambridge University Press:  12 April 2016

Arthur N. Cox
Arthur N. Cox*
Affiliation:
Theoretical Division, Los Alamos Scientific Laboratory University of California, Los Alamos, NM 87545

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The RR Lyrae variables are currently believed to have masses between about 0.5 and 0.8 M⊙, effective surface temperatures between 6350 and 7500K, radii from about 4.0 to 6.0 R⊙ and luminosities between log L/L⊙ of 1.5 and 2.0. Since they are found in population II locations, they generally have Y = 0.3 and Z = 10−3 , but there are exceptions for both higher Z like the sun and lower Z like 0.0002. In globular clusters the periods range from 0.25 - 0.45 day for the first overtone pulsators and 0.40 - 0.80 day for those in the fundamental mode, depending on their luminosity. At transition lines, to be discussed in detail below, the switch from fundamental to first overtone, or maybe vice versa, involves a period change factor of about 0.74 - 0.75.

Type
VII. RR Lyrae and BL Herculis Variables
Information
International Astronomical Union Colloquium , Volume 58: Stellar Hydrodynamics , August 1980 , pp. 475 - 481
Copyright
Copyright © Reidel 1980

References

Butler, D., Dickens, R. J., and Epps, E. , 1978. Ap. J. 225, p.148.Google Scholar
Caputo, F., Castellani, V., and Tornambe, , 1980. Astron. Astrophysics 82, p. 79.Google Scholar
Caputo, F., Castellani, F., and Tornambe, , 1978. Astron. Astrophysics 67, p.107 Google Scholar
Deupree, R. G., 1977, Ap. J. 214, p.502.Google Scholar
Spangenberg, W. H., 1975. Cepheid Modeling NASA SP 383, p. 262.Google Scholar
Stobie, R. S., 1971. Ap. J. 168, p. 381.Google Scholar
Stellingwerf, R. F., 1974. Ap. J. 192, p.139.Google Scholar
Stellingwerf, R. F., 1975 Ap. J. 195, p. 414.CrossRefGoogle Scholar
Sweigart, A. V., and Gross, P. R., 1976. Ap. J. Suppl. 32, p. 367.Google Scholar
Van Albada, T. S., and Baker, N. 1973. Ap. J. 185, p. 447 CrossRefGoogle Scholar
Von Sengbusch, K., 1975. Memoires Soc. Roy. Sci. Liege 8, p.l89.Google Scholar