Period changes of the long-period cataclysmic binary EX Draconis

Details Period changes of the long-period cataclysmic binary EX Draconis Period changes of the long-period cataclysmic binary EX Draconis

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012a%26a...539a.153p&link_type=abstract

Astronomy & Astrophysics, Volume 539, id.A153

Astronomy and Astrophysics

Astrophysics

Binaries: Close, Binaries: Eclipsing, Stars: Dwarf Novae, Stars: Individual: Ex Draconis, Novae, Cataclysmic Variables

Scientific paper

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 ΔP/P = 3 × 10-6.

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