Journal Article

Approximating RR Lyrae light curves using cubic polynomials

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

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 3, pages 1801-1806
Published in print September 2010 | ISSN: 0035-8711
Published online September 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17017.x
Approximating RR Lyrae light curves using cubic polynomials

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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 RRc 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 RRc stars, 29 RRab stars and three multiperiodic stars.

Keywords: stars: fundamental parameters; RR Lyraes

Journal Article.  4515 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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