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Photometric and Spectroscopic Investigations of the Galactic Field RRc Candidates V764 Mon and HY Com

Benkő J. M., Sódor Á., Pál A.

Acta Astronomica

2021

Vol. 71, No. 1

55--72

By analyzing photometric and spectroscopic time series, we show that the pulsator V764 Mon, assumed to be the brightest RR Lyr star in the sky, is in fact a rapidly rotating δ Sct star with an unusually long dominant period (P1=0.29 d). Our spectroscopy confirmed the binarity of V764 Mon discovered by the Gaia satellite. In the case of HY Com, a bona fide RRc star, we present its first complete radial velocity curve. Additionally, we found that the star continues its strong phase variation reported before.