Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-30T02:28:54.108Z Has data issue: false hasContentIssue false
  • English
  • Français

The RR Lyrae Stars in the Magellanic Clouds

Published online by Cambridge University Press:  12 April 2016

J. A. Graham
J. A. Graham*
Affiliation:
Cerro Tololo Inter-American Observatory*

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 characteristics of the RR Lyrae stars in the Magellanic Clouds are discussed. The existence of numerous RR Lyrae variables in the Large Magellanic Cloud (LMC) cluster NGC 1835 is noted. The variables indicate that this cluster is of Oosterhoff type I. No cluster of Oosterhoff type II has yet been recognized in the Clouds. Some new results of a study of the RRLyrae variables in an LMC field 1° x 1.°3 are discussed. Periods have been determined for 50 out of 72 probable RR lyraes in this field. RR Lyrae ab stars with periods less than 0.d46 are absent. The time averaged and are 19.m56 and 19.m20 with surprisingly small dispersion. First impressions of results for a similar field in the Small Magellanic Cloud (SMC) suggest that the old stellar population of the SMC may have a slightly lower metal abundance than that of the LMC. The best available distance moduli for the Magellanic Clouds indicate a mean absolute visual magnitude M of +0.m5 ±0.2 for the RR Lyrae stars in these systems.

Type
Part II / RR Lyrae Variables in Population II Systems
Information
International Astronomical Union Colloquium , Volume 21: Variable Stars in Globular Clusters and in Related Systems , August 1973 , pp. 120 - 128
Copyright
Copyright © Reidel 1973

References

Alexander, J. B.: 1960, Monthly Notices Roy. Astron. Soc. 121, 97.CrossRefGoogle Scholar
Andrews, P. J. and Lloyd Evans, T.: 1971, in Muller, A. B., (ed.), The Magellanic Clouds, D. Reidel, Dordrecht, Holland, p. 88.CrossRefGoogle Scholar
Bergh, S. van den: 1968, Comm. David Dunlap Obs. No. 195.Google Scholar
Christy, R. F.: 1966, Ann. Rev. Astron. Astrophys. 4, 353.CrossRefGoogle Scholar
Christy, R. F.: 1971, in Muller, A. B. (ed.), The Magellanic Clouds, D. Reidel, Dordrecht, Holland, p. 136 CrossRefGoogle Scholar
Clube, S. V.: 1971, in de Jager, C. (ed.), Highlights of Astronomy (XIV General Assembly IAU), D. Reidel, Dordrecht, Holland, p. 788.CrossRefGoogle Scholar
Feast, M. W.: 1968, Monthly Notices Roy. Astron. Soc. 140, 345.CrossRefGoogle Scholar
Gascoigne, S. C. B.: 1962, Monthly Notices Roy. Astron. Soc. 124, 201.CrossRefGoogle Scholar
Gascoigne, S. C. B.: 1966, Monthly Notices Roy. Astron. Soc. 134, 59.CrossRefGoogle Scholar
Gascoigne, S. C. B.: 1969, Monthly Notices Roy. Astron. Soc. 146, 1.CrossRefGoogle Scholar
Graham, J. A.: 1970, Publ. Astron. Soc. Pacific 82, 918.CrossRefGoogle Scholar
Graham, J. A. and Araya, G.: 1971, Astron. J. 76, 768.CrossRefGoogle Scholar
Norris, M. V.: 1972, in IAU Colloquium No. 21.Google Scholar
Philip, A. G. D.: 1971, Bull. Am. Astron. Soc. 3, 367.Google Scholar
Sandage, A.: 1959, Astrophys. J. 129, 596.CrossRefGoogle Scholar
Sandage, A.: 1970, Astrophys. J. 162, 841.CrossRefGoogle Scholar
Sandage, A. and Tammann, G. A.: 1971, Astrophys. J. 167, 293.CrossRefGoogle Scholar
Smith, M. G. and Weedman, D. W.: 1972, (in press).Google Scholar
Thackeray, A. D.: 1951, Observatory 71, 219.Google Scholar
Thackeray, A. D.: 1958, Monthly Notices Roy. Astron. Soc. 118, 117.CrossRefGoogle Scholar
Thackeray, A. D. and Wesselink, A. J.: 1953. Nature 171, 693.CrossRefGoogle Scholar
Tifft, W. G.: 1963, Monthly Notices Roy. Astron. Soc. 125, 199.CrossRefGoogle Scholar
Tifft, W. G. and Snell, C.: 1971, Monthly Notices Roy. Astron. Soc. 151, 365.CrossRefGoogle Scholar
Walker, M. F.: 1970, Astrophys. J. 161, 835.CrossRefGoogle Scholar
Walker, M. F.: 1971, Astrophys. J. 167, 1.CrossRefGoogle Scholar
Walker, M. F.: 1972, Monthly Notices Roy. Astron. Soc. (in press).Google Scholar
Webster, B. L.: 1969, Monthly Notices Roy. Astron. Soc. 143, 97.CrossRefGoogle Scholar
Wesselink, A. J.: 1971, Monthly Notices Roy. Astron. Soc. 152, 159.CrossRefGoogle Scholar
Westerlund, B. E.: 1970, in Beer, A. (ed.), Vistas in Astronomy 12, Pergamon Press, New York, p. 335.Google Scholar