Period changes of the long-period cataclysmic binary EX Draconis

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SYSNO ASEP	0388383
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Period changes of the long-period cataclysmic binary EX Draconis
Author(s)	Pilarčík, L. (CZ) Wolf, M. (CZ) Dubovsky, P.A. (SK) Hornoch, Kamil (ASU-R)_ORCID Kotková, Lenka (ASU-R)
Source Title	Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361 Roč. 539, March (2012), A153/1-A153/5
Number of pages	5 s.
Language	eng - English
Country	FR - France
Keywords	close binaries ; eclipsing ; stars
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
Institutional support	ASU-R - RVO:67985815
UT WOS	000303262000160
DOI	10.1051/0004-6361/201117972
Annotation	The cataclysmic variable star EX Dra is a relatively faint but frequently investigated eclipsing dwarf nova. In total 35 new eclipses were measured photometrically as part of our long-term monitoring of interesting eclipsing systems. Using published and new mid-eclipse times obtained between 2004 and 2011 we constructed the observed-minus-calculated diagram. The current data present 21 years of period modulation with a semi-amplitude of 2.5 min. The eclipse timings show significant deviations from the best sinusoidal fit, which indicates that this ephemeris is not a complete description of the data.
Workplace	Astronomical Institute
Contact	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Year of Publishing	2013

Number of the records: 1