Hostname: page-component-848d4c4894-tn8tq Total loading time: 0 Render date: 2024-06-20T14:43:07.912Z Has data issue: false hasContentIssue false
  • English
  • Français

Duplicity among the Cepheids in the Northern Hemisphere

Published online by Cambridge University Press:  12 April 2016

G. Szabados
G. Szabados*
Affiliation:
Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 67, Hungary

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.

Cepheid variables in binaries are important from various points of view. These objects can in some cases provide direct information about the physical parameters of the system, can be used as tracers of stellar evolution, and the effect of the companions may influence the form of various relations (e.g. P-L-C, P-R) derived for Cepheids. While the first two advantages mentioned concern individual stars, the third involves the question of the frequency of binaries among the Cepheids. Systematic searches for binaries containing this kind of variable resulted in increasingly higher frequency of incidence: 2% (Abt 1959), 15% (Lloyd Evans 1968), >20% (Madore 1977), 25% (Pel 1978), 20%-40% (DeYoreo & Karp 1979), 35% (Madore & Fernie 1980). It was only in the early eighties that this trend ceased. The recent determinations of the incidence of binaries among the Cepheids are: 20%-40% (Gieren 1982), 18% (lower limit, Lloyd Evans 1982), 25% (Russo 1982), 25%-35% (Burki 1984). At the same time we have been going over to a qualitative era from the quantitative one, i.e. very thorough studies are now available on some individual cases of binary Cepheids (e.g. McNamara & Feltz 1981; Coulson 1983; Evans 1983; Bohm-Vitense et al. 1984).

Type
Part I. Fundamental Parameters
Information
International Astronomical Union Colloquium , Volume 82: Cepheids: Theory and Observations , 1985 , pp. 75 - 78
Copyright
Copyright © Cambridge University Press 1985

References

Abt, H. A. (1959). Astrophys. J., 130, 769.10.1086/146768CrossRefGoogle Scholar
Balona, L. A.(1977). Mon. Not. R. astr. Soc., 178, 231.10.1093/mnras/178.2.231CrossRefGoogle Scholar
Böhm-Vitense, E., Borutzki, S. & Harris, H. (1984). preprint.Google Scholar
Burki, G. (1984). Astron. Astrophys., 133, 185.Google Scholar
Burki, G. & Mayor, M. (1983). Astron. Astrophys., 124, 256.Google Scholar
Coulson, I. M.(1983). Mon. Not. R. astr. Soc., 203, 925.10.1093/mnras/203.4.925CrossRefGoogle Scholar
Dean, J. F. (1977). MNASSA, 36, No.l, 3.Google Scholar
DeYoreo, J. J. & Karp, A. H. (1979), Astrophys. J., 232, 205.10.1086/157280CrossRefGoogle Scholar
Evans, N. R. (1983). Astrophys. J., 272, 214.10.1086/161281CrossRefGoogle Scholar
Evans, N. R. (1984). preprint.Google Scholar
Gieren, W. (1982). Astrophys. J. Suppl., 49, 1.10.1086/190788CrossRefGoogle Scholar
Harris, H. C. (1981). Astron. J., 86, 707.10.1086/112936CrossRefGoogle Scholar
Herbig, G. H. & Moore, J. H. (1952). Astrophys. J., 116, 348.10.1086/145619CrossRefGoogle Scholar
Hutchinson, J. (1977). B.A.A.S., 9, 357.Google Scholar
Janot-Pacheco, E. (1976). Astron. Astrophys. Suppl. Ser., 25, 159.Google Scholar
Kurochkin, N. E. (1966). Perem. Zvezdy, 16, 10.Google Scholar
Lloyd Evans, T.(1968). Mon. Not. R. astr. Soc., 103.Google Scholar
Lloyd Evans, T.(1982). Mon. Not. R. astr. Soc., 199, 925.10.1093/mnras/199.4.925CrossRefGoogle Scholar
Lloyd Evans, T. (1984). Observatory, 104, 26.Google Scholar
Madore, B. F. (1977). Mon. Not. R. astr. Soc., 178, 505.10.1093/mnras/178.3.505CrossRefGoogle Scholar
Madore, B. F. & Fernie, J. D. (1980). P.A.S.P., 92, 315.10.1086/130668CrossRefGoogle Scholar
Mariska, J. T., Doschek, G. A. & Feldman, U. (1980a). Astrophys.J., 238,L87.10.1086/183264CrossRefGoogle Scholar
Mariska, J. T., Doschek, G. A. & Feldman, U. (1980b). Astrophys.J., 242, 1083.10.1086/158539CrossRefGoogle Scholar
McNamara, D. H. & Chapman, R. (1977). P.A.S.P., 89, 329.10.1086/130126CrossRefGoogle Scholar
McNamara, D. H. & Feltz, K. A. Jr. (1981). In: “Effects of Mass Loss on Stellar Evolution”, eds. Chiosi, C. & Stalio, R., p. 389. Reidel, D. Dordrecht.10.1007/978-94-009-8500-1_56CrossRefGoogle Scholar
Mianes, P. (1963). Ann. d’Astrophys., 26, 1.Google Scholar
Miller, J. & Preston, G. W. (1964a). Astrophys. J., 139, 1126.10.1086/147853CrossRefGoogle Scholar
Miller, J. & Preston, G. W. (1964b). P.A.S.P., 76, 47.10.1086/128044CrossRefGoogle Scholar
Millis, R. L. (1969). Lowell Obs. Bull., No. 148.Google Scholar
Oosterhoff, P. Th. (1960). P.A.S.P., 72, 313.10.1086/127531CrossRefGoogle Scholar
Parsons, S. B. (1981). Astrophys. J., 247, 560.10.1086/159066CrossRefGoogle Scholar
Pel, J. W. (1978). Astron. Astrophys., 62, 75.Google Scholar
Plaut, L. (1934). Bull. astr. Inst. Neth., 7, 181.Google Scholar
Russo, G. (1982). In: “Binary and Multiple Stars as Tracers of Stellar Evolution”, eds. Kopal, Z. & Rahe, J., p. 23, Reidel, D., Dordrecht.10.1007/978-94-009-7861-4_3CrossRefGoogle Scholar
Szabados, L. (1977). Mitt. Sternw. ung. Akad. Wiss., Budapest, No. 70.Google Scholar
Szabados, L. (1980). Mitt. Sternw. ung. Akad. Wiss., Budapest, No. 76.Google Scholar
Szabados, L. (1981). Commun,. Konkoly Obs. Hung. Acad. Sci., Budapest, No. 77.Google Scholar
Szabados, L. (1983). Astrophys. Space Sci., 96, 185.10.1007/BF00661952CrossRefGoogle Scholar