Approximating RR Lyrae light curves using cubic polynomials

Details Approximating RR Lyrae light curves using cubic polynomials Approximating RR Lyrae light curves using cubic polynomials

2010-05-13

arxiv.org/abs/1005.2345v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, MNRAS accepted

Scientific paper

In this paper, we use cubic polynomials to approximate RR Lyrae light curves and apply the method to HST data of RR Lyraes in the halo of M31. We compare our method 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 RRc stars the parameters in the fit are all physical. Our study also reveals a number of additional periodicites in this data not found previously: we find 23 RRc stars, 29 RRab stars and 3 multiperiodic stars.

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