Abstract
A study of the mean photographic magnitudes of RR Lyrae variables in galactic globular clusters has shown that the luminosity of RR-ab variables decreases with period. It is found that RR-ab variables, in the cluster ω Centauri, whose distances are greater than 8 arc min from the centre of the cluster, are less luminous than such variables seen in the inner region. The possibility of two transition periods for RR-ab variables, one near 0 d. 4 and the other near 0 d. 9, is suggested to explain the sharp boundaries of the instability gap and of the periods of RR Lyrae variables. It is also shown that the inner RR Lyrae variables in ω Centauri are more massive than the outer ones.
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Scaria, K.K. A possible P-L relation for RR-Lyrae variables in globular clusters. Astrophys Space Sci 103, 207–218 (1984). https://doi.org/10.1007/BF00653737
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DOI: https://doi.org/10.1007/BF00653737