Period changes of the long-period cataclysmic binary EX Draconis

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10128486" target="_blank" >RIV/00216208:11320/12:10128486 - isvavai.cz</a>
Alternative codes found
RIV/67985815:_____/12:00388383
Result on the web
<a href="http://dx.doi.org/10.1051/0004-6361/201117972" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201117972</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/201117972" target="_blank" >10.1051/0004-6361/201117972</a>

Result language
angličtina
Original language name
Period changes of the long-period cataclysmic binary EX Draconis
Original language description
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 andnew 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).
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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