Period changes of the long-period cataclysmic binary EX Draconis

被引：8

作者：

Pilarcik, L. ^{[1
]}

Wolf, M. ^{[1
]}

Dubovsky, P. A. ^{[2
]}

Hornoch, K. ^{[3
]}

Kotkova, L. ^{[3
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Astron Inst, CR-18000 Prague 8, Czech Republic

[2] Vihorlat Observ, Humenne 06601, Slovakia

[3] Acad Sci Czech Republ, Inst Astron, CS-25165 Ondrejov, Czech Republic

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 539卷

关键词：

binaries: close; binaries: eclipsing; stars: dwarf novae; stars: individual: EX Draconis; novae; cataclysmic variables; ORBITAL PERIOD; MAGNETIC BRAKING; DWARF; MODULATION;

D O I：

10.1051/0004-6361/201117972

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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. The fractional period change is roughly Delta P/P = 3x10(-6).

引用

页数：5

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