Period changes of the long-period cataclysmic binary EX Draconis

0388383 - ASÚ 2013 RIV FR eng J - Článek v odborném periodiku
Pilarčík, L. - Wolf, M. - Dubovsky, P.A. - Hornoch, Kamil - Kotková, Lenka
Period changes of the long-period cataclysmic binary EX Draconis.
Astronomy & Astrophysics. Roč. 539, March (2012), A153/1-A153/5. ISSN 0004-6361. E-ISSN 1432-0746
Institucionální podpora: RVO:67985815
Klíčová slova: close binaries * eclipsing * stars
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 5.084, rok: 2012

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.
Trvalý link: http://hdl.handle.net/11104/0217272