Photometric study of the star with changing Blazhko effect: TV~Bootis

Abstract

This study investigates periodic modulation of the light curve of the RRc star TV Boo and its physical parameters based on photometric data. This phenomenon, known as Blazhko effect, is quite rare among RRc stars. Frequency analysis based on the data gathered at Masaryk University Observatory (MUO) and also using SuperWASP data revealed symmetrically structured peaks around the main pulsation frequency and its harmonics, which indicate two modulation components of the Blazhko period. The main modulation periodicity was found to be 9.7374(54) d. This is one of the shortest known Blazhko periods among RRc stars. The second modulation period 21.5(2) d causes changes of the Blazhko effect itself. Some indices show that TV Boo could be affected by long-term changes in the order of years. Basic physical parameters were estimated via a MUO V light curve solution using Fourier parameters. TV Boo seems to be a low-metalicity star with [Fe/H]=-1.89.

arXiv comment7 pages, 6 figures, 5 tables, published in MNRAS

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Cited by in corpus (4)

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• An RR Lyrae family portrait: 33 stars observed in Pisces with K2-E2
• Bright Blazhko RRab Lyrae stars observed by ASAS and the SuperWASP surveys
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