The period variation of DY Hercules |
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Authors: | Chayan Boonyarak Shi Yang Jiang |
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Institution: | (1) Physics Department, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand;(2) National Astronomical Observatory, Chinese Academy of Sciences, Beijing, 100012, China |
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Abstract: | In this paper the researchers collected 28 times of maximum light including 4 times of those observed at the Xinglong station,
the National Astronomical Observation of China between May 27, 2004 and June 1, 2004 and 1 time of maximum light from a 60
cm telescope on May 4, 1984. It found that the O-C point distribution was more completely compared than in any papers published
before. The period is decreasing at the rate of about (1.4±0.1)×10−8 per year, which should not be caused by stellar evolution. It might be only part of a binary orbital light-time variation
or other unknown reason. The time scale is longer than Pocs and Szeidl’s suggestion; the star needs more observations before
we can be certain of the exact light-time variation. |
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Keywords: | DY Her Delta Scuti HADS Period variation Variable star |
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