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A Century in Period Changes of the Variables in M15

  • Katalin Barlai (a1) and B. Szeidl (a1)

Abstract

Period behaviour of 62 RR Lyrae stars in the M15 globular cluster has been investigated. About one half of the sample (30 stars) exhibited linear period change. The remaining 32 variables can be characterized by abrupt or erratic changes in their periods.

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References

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Bailey, S.I. 1919, Harvard Ann., 78, Part 3
Barlai, K. 1989, Communication fron the Konkoly Observatory of the Hung. Acad. Sci., No. 92, Vol. 10, Part 6
Jurcsik, J., & Barlai, K. 1990, in: Cacciari, C. & Clementini, G. (eds.), Confrontation between Stellar Pulsation and Evolution, ASP Conf. Ser., 11, p. 112
Lee, Y.W. 1991, ApJ, 367, 524
Smith, H.A., & Sandage, A. 1981, ApJ, 86, 1870
Sweigart, A.V., & Renzini, A. 1979, A&A, 71, 66

A Century in Period Changes of the Variables in M15

  • Katalin Barlai (a1) and B. Szeidl (a1)

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