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- Title
The contact binary V344 Lacertae: is it a triple system?
- Authors
Liu, Liang; Qian, Shengbang; Li, Kai; He, Jiajia; Li, Linjia; Zhao, Ergang; Li, Xuzhi
- Abstract
The V R I passbands light curves of V344 Lac were presented and analyzed by using the latest version of the W-D code. The observed spectrum reveals that V344 Lac is not an A3 type but would be a later F type star according to the yielded temperature. The results of solution show that V344 Lac is an A-subtype contact binary, with a moderate photometric mass ratio of 0.387 ± 0.003 and a moderate contact factor of 44.6 ± 3.0 % . Based on the parallax given by Gaia, the parameters of the components are estimated as: M 1 = 1.16 M ⊙ , M 2 = 0.45 M ⊙ , R 1 = 1.31 R ⊙ , R 2 = 0.88 R ⊙ , L 1 = 2.512 L ⊙ , L 2 = 1.057 L ⊙ . The period investigation indicates that V344 Lac may have an eccentric orbital oscillation, with P 3 = 12.4 ± 0.5 yr , A 3 = 0.0020 ± 0.0002 d , and e = 0.38 ± 0.16 . Analysis shows such oscillation would be caused by a magnetic activity which can be explained by the Applegate mechanism. Meanwhile, according to the value of l 3 and the estimated physical parameters of V344 Lac, the mass of the third companion may be 0.79 M ⊙ . This third body could be a wide company.
- Subjects
LIGHT curves; BINARY stars; PARALLAX; ECLIPSING binaries; QUASIGROUPS; OSCILLATIONS
- Publication
Astrophysics & Space Science, 2020, Vol 365, Issue 4, p1
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-020-03784-8