Approximating RR Lyrae light curves using cubic polynomials

S. Reyner, S. M. Kanbur, C. Ngeow, C. Morgan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In this paper, we use cubic polynomials to approximate RR Lyrae light curves and apply the method to Hubble Space Telescope data of RR Lyrae stars in the halo of M31. We compare our results to the standard method of Fourier decomposition and find that the method of cubic polynomials eliminates virtually all ringing effects and does so with significantly fewer parameters than the Fourier technique. Further, for RR. c stars the parameters in the fit are all physical in the sense that they can, in principle, be related to pulsation physics. Our study also reveals a number of additional periodicities in this data not found previously: we find 23 RR. c stars, 29 RR. ab stars and three multiperiodic stars.

Original languageEnglish
Pages (from-to)1801-1806
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Sep 2010


  • RR Lyraes
  • Stars: fundamental parameters


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