SS Cancri: the shortest modulation-period Blazhko RR Lyrae

Cafolla, C. and Mathew, R.S. and Edge, A.C. and Swinbank, A.M. and Lansbury, G.B. and Wilson, R.W. and Butterley, T. and Lucey, J.R. and Hardy, L.K. and Littlefair, S.P. and Dhillon, V.S. (2017) SS Cancri: the shortest modulation-period Blazhko RR Lyrae. Information Bulletin on Variable Stars, 63 (6213). ISSN 1587-2440

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Abstract

In order to study the Blazhko effect, we characterise the modulation of the RR Lyrae star SS Cancri, which has been reported to have the shortest modulation Blazhko period. B, V and R band data have been acquired. The pulsation period is 0.36731 +- 0.00004 d. No significant change in the period over the last 80 years is observed. We measure a periodic variation in the light curve maxima, which has a period of 5.313 +- 0.018 d and an amplitude of 0.016 +- 0.003 mag. The best model that describes the Blazhko effect is the resonance coupling between a low and a high order radial mode.

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