The period variation of DY Hercules

Details The period variation of DY Hercules The period variation of DY Hercules

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ap%26ss.310..285b&link_type=abstract

Astrophysics and Space Science, Volume 310, Issue 3-4, pp. 285-291

Astronomy and Astrophysics

Astrophysics

1

Dy Her, Delta Scuti, Hads, Period Variation, Variable Star

Scientific paper

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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