Long-term photometric monitoring of Messier 5 variables – I. Period changes of RR Lyrae stars

  title={Long-term photometric monitoring of Messier 5 variables – I. Period changes of RR Lyrae stars},
  author={B. Szeid and Zs. Hurta and Johanna Jurcsik and Christine M. Coutts Clement and M. Lovas},
  journal={Monthly Notices of the Royal Astronomical Society},
The period changes of 86 M5 RR Lyrae stars have been investigated on a 100-yr time base. The published observations have been supplemented by archival Asiago, Konkoly and Las Campanas photographic observations obtained between 1952 and 1993. About two-thirds of the O - C diagrams could be fitted by a straight line or a parabola. 21 RR Lyrae stars have increasing, 18 decreasing and 16 constant period. The mean rates of period change of these variables are: 〈β〉 = 〈P〉 = -0.006 ± 0.162 d Myr -1… 

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