Rapid apsidal motion in V381 Cassiopeiae |
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| Authors: | M Wolf L Šmelcer H Kučáková T Hynek K Onderková P Svoboda M Chrastina |
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| Institution: | 1. Astronomical Institute, Faculty of Mathematics and Physics, Charles University Prague, CZ-180 00 Praha 8, V Hole?ovi?kách 2, Czech Republic;2. Observatory Vala?ské Mezi?í?í, Vsetínská 78, CZ-757 01 Vala?ské Mezi?í?í, Czech Republic;3. Johann Palisa Observatory and Planetarium, Technical University Ostrava, 17. Listopadu 15, CZ-708 33 Ostrava, Czech Republic;4. Private Observatory, Výpustky 5, CZ-614 00 Brno, Czech Republic;5. Institute of Theoretical Physics and Astrophysics, Masaryk University, Kotlá?ská 2, CZ-611 37 Brno, Czech Republic |
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| Abstract: | V381 Cas is a relatively bright and early-type eclipsing binary system. Several new times of its eclipses were measured as part of our long-term observational project of eccentric eclipsing binaries. Based on a current O–C diagram solution, we found for the first time that its orbit is slightly eccentric (e = 0.025) and shows a very rapid apsidal advance with short period of about 20 years only. The relativistic and third body effects are negligible, being about 3% of the total apsidal motion rate. |
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