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• W2897727991 abstract "We report here on a detailed study of a c-type RR Lyrae variable (RRc variable), SB 796, serendipitously discovered in a search of the WASP public data for stars that display large photometric periodic modulation. SB 796 displays a period of $P = 0.26585$ d and semi-amplitude of $sim$ 0.1 mag. Comparison of the modulation shape and period with the detailed analysis of LMC variables indicates that SB 796 is an RRc variable. Gaia DR2 classification corroborated our result. Radial-velocity (RV) follow-up observations revealed a periodic variation consistent with a sine modulation, with a semi-amplitude of $5.6pm0.2$ km/s, and a minimum at phase of maximum brightness. Similar amplitude and phase were previously seen in other RRc variables. The stellar averaged RV is $sim 250$ km/s, turning SB 796 to be a high-velocity star, while its present position, as derived from the Gaia astrometry, is at $sim 3.5$ kpc below the Galactic plane. Integration of the stellar Galactic motion shows that SB 796 oscillates at a range of 0.5--20 kpc Galacto-centric distance, passing near the Galactic center about three times in 1 Gyr. The Galactic radial motion takes SB 796 up and down the plane to a scale height of $sim 10$ kpc. During its $sim10$ Gyrs estimated life time, SB 796 therefore passed $sim 30$ times near the Galactic center." @default.
• W2897727991 created "2018-10-26" @default.
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• W2897727991 date "2018-10-22" @default.
• W2897727991 modified "2023-10-17" @default.
• W2897727991 title "SB 796: a high-velocity RRc star" @default.
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• W2897727991 doi "https://doi.org/10.1093/mnras/sty2828" @default.
• W2897727991 hasPublicationYear "2018" @default.
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