The Orbital Period and Variability of the Dwarf Nova ES Draconis

Details The Orbital Period and Variability of the Dwarf Nova ES Draconis The Orbital Period and Variability of the Dwarf Nova ES Draconis

2011-07-21

arxiv.org/abs/1107.4175v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

16 pages, 6 figures, accepted for publication in New Astronomy

Scientific paper

A radial velocity study of the cataclysmic variable ES Dra (PG 1524+622) is presented. ES Dra is found to have an orbital period of 0.17660 \pm 0.00006 d (4.2384 \pm 0.0014 h). The mass-losing secondary star of ES Dra is detectable in the spectrum, and it has a spectral type of M2 \pm 1. From this, we estimate the absolute magnitude of ES Dra during our spectroscopic observations to have been MR = 6.5 \pm 0.5, and its distance to be 720 \pm 150 pc. The long-term light curve of ES Dra compiled by the American Association of Variable Star Observers (AAVSO) shows that ES Dra is a Z Cam star, which between 1995 and 2009 spent most of its time in standstill.

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