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The orbital period and variability of the dwarf nova ES Draconis

Authors
Journal
New Astronomy
1384-1076
Publisher
Elsevier
Publication Date
Volume
17
Issue
2
Identifiers
DOI: 10.1016/j.newast.2011.07.007
Keywords
  • Stars: Individual: Es Dra (Pg 1524+622)
  • Novae: Cataclysmic Variables
  • Binaries: Spectroscopic
  • Aavso

Abstract

Abstract 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 ± 0.00006 day (4.2384 ± 0.0014 h). The mass-losing secondary star of ES Dra is detectable in the spectrum, and it has a spectral type of M2 ± 1. From this, we estimate the absolute magnitude of ES Dra during our spectroscopic observations to have been M R = 6.5 ± 0.5, and its distance to be 720 ± 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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