The First Multi-Color Photometric Study of the Short-Period Contact Eclipsing Binary GK Aqr

Liyun Zhang; Qingfeng Pi; Xianming Han; TongAn Li; Xiliang Zhang; Hongyan Sang; Daimei Wang; Shuai Wang

doi:10.1016/j.newast.2015.02.002

The First Multi-Color Photometric Study of the Short-Period Contact Eclipsing Binary GK Aqr

Liyun Zhang, Qingfeng Pi, Xianming Han, TongAn Li, Xiliang Zhang, Hongyan Sang, Daimei Wang, Shuai Wang

Research output: Contribution to journal › Article › peer-review

Abstract

We made the first VRI CCD light curves of the short-period contact eclipsing binary GK Aqr, which was observed on October 5 and 8, 2013 at Xinglong station of National Astronomical Observatories, China. The ephemeris of GK Aqr was calculated based on our two newly obtained minima and the minima that other observers obtained previously. We discovered that the orbital period of GK Aqr exhibits an increasing trend of Ṗ=2.8(0.1)×10^-7 days/year by means of fitting the O-C values of the minima. This phenomenon might be explained by mass transfer from the primary (less massive) component to the secondary (more massive) one. With the updated Wilson & Devinney program, we obtained the photometric orbital parameters for the first time. Using our parameters, we also successfully explained the light curve obtained from the All Sky Automated Survey data. In the end, we concluded that GK Aqr is a near contact binary with a low contact factor of 5.2%. As the mass transfer continues, GK Aqr could become a contact system and evolve into an over-contact system.

Original language	American English
Journal	Scholarship and Professional Work - LAS
Volume	38
DOIs	https://doi.org/10.1016/j.newast.2015.02.002
State	Published - Jan 1 2015

Keywords

binaries
eclipsing
individual GK Aqr
period evaluation
stars

Disciplines

Astrophysics and Astronomy
Stars, Interstellar Medium and the Galaxy

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http://dx.doi.org/10.1016/j.newast.2015.02.002

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@article{50803315e9b2411a85c14c51451564bd,

title = "The First Multi-Color Photometric Study of the Short-Period Contact Eclipsing Binary GK Aqr",

abstract = " We made the first VRI CCD light curves of the short-period contact eclipsing binary GK Aqr, which was observed on October 5 and 8, 2013 at Xinglong station of National Astronomical Observatories, China. The ephemeris of GK Aqr was calculated based on our two newly obtained minima and the minima that other observers obtained previously. We discovered that the orbital period of GK Aqr exhibits an increasing trend of {\.P}=2.8(0.1)×10\textasciicircum{}-7 days/year by means of fitting the O-C values of the minima. This phenomenon might be explained by mass transfer from the primary (less massive) component to the secondary (more massive) one. With the updated Wilson \& Devinney program, we obtained the photometric orbital parameters for the first time. Using our parameters, we also successfully explained the light curve obtained from the All Sky Automated Survey data. In the end, we concluded that GK Aqr is a near contact binary with a low contact factor of 5.2\%. As the mass transfer continues, GK Aqr could become a contact system and evolve into an over-contact system.",

keywords = "binaries, eclipsing, individual GK Aqr, period evaluation, stars",

author = "Liyun Zhang and Qingfeng Pi and Xianming Han and TongAn Li and Xiliang Zhang and Hongyan Sang and Daimei Wang and Shuai Wang",

year = "2015",

month = jan,

day = "1",

doi = "10.1016/j.newast.2015.02.002",

language = "American English",

volume = "38",

journal = "Scholarship and Professional Work - LAS",

}

TY - JOUR

T1 - The First Multi-Color Photometric Study of the Short-Period Contact Eclipsing Binary GK Aqr

AU - Zhang, Liyun

AU - Pi, Qingfeng

AU - Han, Xianming

AU - Li, TongAn

AU - Zhang, Xiliang

AU - Sang, Hongyan

AU - Wang, Daimei

AU - Wang, Shuai

PY - 2015/1/1

Y1 - 2015/1/1

N2 - We made the first VRI CCD light curves of the short-period contact eclipsing binary GK Aqr, which was observed on October 5 and 8, 2013 at Xinglong station of National Astronomical Observatories, China. The ephemeris of GK Aqr was calculated based on our two newly obtained minima and the minima that other observers obtained previously. We discovered that the orbital period of GK Aqr exhibits an increasing trend of Ṗ=2.8(0.1)×10^-7 days/year by means of fitting the O-C values of the minima. This phenomenon might be explained by mass transfer from the primary (less massive) component to the secondary (more massive) one. With the updated Wilson & Devinney program, we obtained the photometric orbital parameters for the first time. Using our parameters, we also successfully explained the light curve obtained from the All Sky Automated Survey data. In the end, we concluded that GK Aqr is a near contact binary with a low contact factor of 5.2%. As the mass transfer continues, GK Aqr could become a contact system and evolve into an over-contact system.

AB - We made the first VRI CCD light curves of the short-period contact eclipsing binary GK Aqr, which was observed on October 5 and 8, 2013 at Xinglong station of National Astronomical Observatories, China. The ephemeris of GK Aqr was calculated based on our two newly obtained minima and the minima that other observers obtained previously. We discovered that the orbital period of GK Aqr exhibits an increasing trend of Ṗ=2.8(0.1)×10^-7 days/year by means of fitting the O-C values of the minima. This phenomenon might be explained by mass transfer from the primary (less massive) component to the secondary (more massive) one. With the updated Wilson & Devinney program, we obtained the photometric orbital parameters for the first time. Using our parameters, we also successfully explained the light curve obtained from the All Sky Automated Survey data. In the end, we concluded that GK Aqr is a near contact binary with a low contact factor of 5.2%. As the mass transfer continues, GK Aqr could become a contact system and evolve into an over-contact system.

KW - binaries

KW - eclipsing

KW - individual GK Aqr

KW - period evaluation

KW - stars

UR - https://digitalcommons.butler.edu/facsch_papers/747

UR - http://dx.doi.org/10.1016/j.newast.2015.02.002

U2 - 10.1016/j.newast.2015.02.002

DO - 10.1016/j.newast.2015.02.002

M3 - Article

VL - 38

JO - Scholarship and Professional Work - LAS

JF - Scholarship and Professional Work - LAS

ER -

The First Multi-Color Photometric Study of the Short-Period Contact Eclipsing Binary GK Aqr

Abstract

Keywords

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