The orbital period and variability of the dwarf nova ES Draconis

被引：3
|
作者：
Ringwald, F. A. [1 ]
Velasco, Kenia [1 ]
机构：
[1] Calif State Univ Fresno, Dept Phys, Fresno, CA 93740 USA
来源：
NEW ASTRONOMY | 2012年 / 17卷 / 02期
基金：
美国国家科学基金会; 美国国家航空航天局;
关键词：
Stars: individual: ES Dra (PG 1524+622); Novae: cataclysmic variables; Binaries: spectroscopic; AAVSO; X-RAY BINARIES; CATACLYSMIC VARIABLES; STUNTED OUTBURSTS; DONOR STARS; SPACED DATA; SPECTROSCOPY; MAGNITUDES; CATALOG; OBJECTS;
D O I：
10.1016/j.newast.2011.07.007
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：108 / 111
页数：4
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