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2019•Research in Astronomy and AstrophysicsOpen access

A photometric study of the high-mass-ratio contact binary AV Puppis

Quanwang Han, Lifang Li, Dengkai Jiang

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Abstract

Abstract The multi-color photometric light curves for contact binary AV Puppis (AV Pup) in VR c I c bandpasses are presented and analyzed by using the 2013 version of the Wilson-Devinney (W-D) code. The solutions suggest that AV Pup is a peculiar A-subtype W UMa contact binary with a high mass ratio ( q = m 2 / m 1 = 0.896) and a low fill-out factor ( f = 10%). Combining our newly determined times of minimum with those collected from literatures, the orbital period changes of this system are investigated. The O – C analysis indicates that the orbital period of AV Pup is increasing at a rate of d P /d t = 4.83 × 10 −7 days yr −1 , which can be explained by mass transfer from the less massive component to the more massive one.

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Abstract The multi-color photometric light curves for contact binary AV Puppis (AV Pup) in VR c I c bandpasses are presented and analyzed by using the 2013 version of the Wilson-Devinney (W-D) code. The solutions suggest that AV Pup is a peculiar A-subtype W UMa contact binary with a high mass ratio ( q = m 2 / m 1 = 0.896) and a low fill-out factor ( f = 10%). Combining our newly determined times of minimum with those collected from literatures, the orbital period changes of this system are investigated. The O – C analysis indicates that the orbital period of AV Pup is increasing at a rate of d P /d t = 4.83 × 10 −7 days yr −1 , which can be explained by mass transfer from the less massive component to the more massive one.

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Available abstract

Abstract The multi-color photometric light curves for contact binary AV Puppis (AV Pup) in VR c I c bandpasses are presented and analyzed by using the 2013 version of the Wilson-Devinney (W-D) code. The solutions suggest that AV Pup is a peculiar A-subtype W UMa contact binary with a high mass ratio ( q = m 2 / m 1 = 0.896) and a low fill-out factor ( f = 10%). Combining our newly determined times of minimum with those collected from literatures, the orbital period changes of this system are investigated. The O – C analysis indicates that the orbital period of AV Pup is increasing at a rate of d P /d t = 4.83 × 10 −7 days yr −1 , which can be explained by mass transfer from the less massive component to the more massive one.

Key concepts: Physics, Astrophysics, Contact binary, Mass ratio, Orbital period, Binary number, Light curve, Low Mass

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