Period changes in ω Centauri RR lyrae stars

J. Jurcsik, C. Clement, E. H. Geyer, I. Domsa

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A century of observations of ω Centauri allows us to accurately follow the period changes of a large sample of variable stars. Although the period changes are composed of monotone and irregular changes, period increases dominate in most of the RRab stars. The typical period increase rates are of the same order of magnitude as model calculations predict for the evolved, redward phase of horizontal-branch evolution. For the 44 well-observed RRab stars that show monotonic period changes, a mean rate of 0.15 days Myr-1 has been found. The period changes of the first-overtone RRc-type stars show a much more complex, irregular behavior.

Original languageEnglish
Pages (from-to)951-973
Number of pages23
JournalAstronomical Journal
Volume121
Issue number2
DOIs
Publication statusPublished - Feb 2001

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stars
variable stars
harmonics
rate
calculation

Keywords

  • Globular clusters: individual (ω Centauri)
  • RR lyrae variable
  • Stars: evolution
  • Stars: horizontal-branch
  • Stars: Oscillations
  • Stars: Population II

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Jurcsik, J., Clement, C., Geyer, E. H., & Domsa, I. (2001). Period changes in ω Centauri RR lyrae stars. Astronomical Journal, 121(2), 951-973. https://doi.org/10.1086/318746

Period changes in ω Centauri RR lyrae stars. / Jurcsik, J.; Clement, C.; Geyer, E. H.; Domsa, I.

In: Astronomical Journal, Vol. 121, No. 2, 02.2001, p. 951-973.

Research output: Contribution to journalArticle

Jurcsik, J, Clement, C, Geyer, EH & Domsa, I 2001, 'Period changes in ω Centauri RR lyrae stars', Astronomical Journal, vol. 121, no. 2, pp. 951-973. https://doi.org/10.1086/318746
Jurcsik, J. ; Clement, C. ; Geyer, E. H. ; Domsa, I. / Period changes in ω Centauri RR lyrae stars. In: Astronomical Journal. 2001 ; Vol. 121, No. 2. pp. 951-973.
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