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- Title
Period study of the δ Scuti variable DE Lac.
- Authors
Wang, S.-M.; Qian, S.-B.; Liao, W.-P.; Zhang, J.; Zhou, X.; Zhao, E.-G.
- Abstract
DE Lac is a high-amplitude δ Scuti variable with a period of 0.253694 days. New CCD photometric monitoring of DE Lac was carried out on 2013 December 18 and 2014 January 5, by using the 1.0-m reflecting telescope at Yunnan Observatories. Photometric observations of DE Lac were also obtained by using the 85-cm telescope at Xinglong Station of National Astronomical Observatory. By using a few new determined times of maximum light together with those collected from the literature, the period changes in Observed-Calculated (O - C) diagram are analyzed. We discover that the pulsating period of DE Lac is increasing continuously at a rate of Ṗ = +3.7 x 10-8 days/year. It is compatible with the prediction from the stellar evolution model calculations. Meanwhile, we collect other δ Scuti stars that have exhibited period changes.
- Subjects
STARS; STELLAR atmospheres; PHOTOMETRY; REFLECTING telescopes; CURVES
- Publication
Bulletin of the Astronomical Society of India, 2014, Vol 42, Issue 1, p19
- ISSN
0304-9523
- Publication type
Article