The Photometric Investigation of V921 Her Using the Lunar-Based Ultraviolet Telescope of Chang’e-3 Mission

Joint Authors

Zhou, Xiao
Qian, Sheng-Bang
Zhang, Jia
Li, Lin-Jia
Wang, Qi-Shan

Source

Advances in Astronomy

Issue

Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-6, 6 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2016-06-15

Country of Publication

Egypt

No. of Pages

6

Main Subjects

Astronomy

Abstract EN

The light curve of V921 Her in ultraviolet band observed by the Lunar-based Ultraviolet Telescope (LUT) is analyzed by the Wilson-Devinney code.

Our solutions conclude that V921 Her is an early type marginal contact binary system with an additional close-in component.

The binary system is under poor thermal contact with a temperature difference of nearly 700 K between the two components.

The close-in component contributes about 19% of the total luminosity in the triple system.

Combining the radial velocity study together with our photometric solutions, the mass of the primary star and secondary one is calculated to be M 1 = 1.784 ( ± 0.055 ) M ⊙ , M 2 = 0.403 ( ± 0.012 ) M ⊙ .

The evolutionary scenario of V921 Her is discussed.

All times of light minimum of V921 Her available in the bibliography are taken into account and the O - C curve is analyzed for the first time.

The most probable fitting results are discussed in the paper, which also confirm the existence of a third component ( P 3 = 10.2 year) around the binary system.

The period of V921 Her is also undergoing a continuously rapid increase at a rate of d P / d t = + 2.79 × 1 0 - 7 d a y · y e a r - 1 , which may be due to mass transfer from the less massive component to the more massive one.

American Psychological Association (APA)

Zhou, Xiao& Qian, Sheng-Bang& Zhang, Jia& Li, Lin-Jia& Wang, Qi-Shan. 2016. The Photometric Investigation of V921 Her Using the Lunar-Based Ultraviolet Telescope of Chang’e-3 Mission. Advances in Astronomy،Vol. 2016, no. 2016, pp.1-6.
https://search.emarefa.net/detail/BIM-1079402

Modern Language Association (MLA)

Zhou, Xiao…[et al.]. The Photometric Investigation of V921 Her Using the Lunar-Based Ultraviolet Telescope of Chang’e-3 Mission. Advances in Astronomy No. 2016 (2016), pp.1-6.
https://search.emarefa.net/detail/BIM-1079402

American Medical Association (AMA)

Zhou, Xiao& Qian, Sheng-Bang& Zhang, Jia& Li, Lin-Jia& Wang, Qi-Shan. The Photometric Investigation of V921 Her Using the Lunar-Based Ultraviolet Telescope of Chang’e-3 Mission. Advances in Astronomy. 2016. Vol. 2016, no. 2016, pp.1-6.
https://search.emarefa.net/detail/BIM-1079402

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1079402