Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-23T20:00:15.247Z Has data issue: false hasContentIssue false
  • English
  • Français

A Theoretical Period-Luminosity Relation of Dwarf Cepheids

Published online by Cambridge University Press:  12 April 2016

D.H. McNamara  and
John M. Powell
D.H. McNamara
Affiliation:
Department of Physics and AstronomyBrigham Young University Provo, Utah 84602USA
John M. Powell
Affiliation:
Department of Physics and AstronomyBrigham Young University Provo, Utah 84602USA

Extract

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.

Dwarf Cepheids (large-amplitude δ Sct variables and SXPhe variables in the GCVS) are late A-type stars near light maximum and early-F stars near light minimum. In the lower part of the instability strip where these stars are found the pulsation constant Q varies only slightly. As pointed out by Andreasen, Hejlesen, and Petersen (1983) this makes it easy to transform a theoretical HR or alternatively a (logTe, logg) diagram to a theoretical logTe, logP0) diagram by the use of the relation. This follows from the equations:

where P0 is the fundamental period of pulsation. The periods, of course, can be determined with very high accuracy.

Type
IV. Related Stars
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 437 - 438
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Andreasen, G.K., Hejlesen, P.M., and Petersen, J.O. 1983, A&A, 121, 241.Google Scholar
Kurucz, R.L. 1988, unpublished.Google Scholar
Mengel, J.G., Sweigart, A.V., DeMarque, P., and Gross, P.G. 1979, APJS, 40, 733.CrossRefGoogle Scholar
Nemec, J., and Mateo, M. 1990 in Confrontation Between Stellar Pulsation and Evolution, eds. Cacciari, C. and Clementini, G., ASPCONF SER 11, 64.Google Scholar
VandenBerg, D.A., 1985, APJS, 58, 711.CrossRefGoogle Scholar