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The ROSAT bright source 1RXS J201607.0+251645:an active Algol-type binary

The ROSAT bright source 1RXS J201607.0+251645:an active Algol-type binary
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摘要 1RXS J201607.0+251645 is identified as an eclipsing binary. We present preliminary observations in the V band with the 0.6-m telescope for three years and extensive observations in the V and R bands with the 0.8-m telescope for six nights, respectively. The light curve of the system is E13 type. Five light minimum times were obtained and the orbital period of 0.388058^d(±0.00044d) is determined. The photometric solution given by the 2003-version of the Wilson-Devinney program suggests that the binary is a semidetached system with photometric mass ratio 0.895(±0.006), which is probably comprised of a G5 primary and an oversized K5 secondary. The tess massive component has completely filled its Roche lobe, while the other one almost fills its Roche lobe with a filling factor of 93.4%. The system shows a varying O'Connell effect in its phase folded diagrams from 2005 to 2007, and is X-ray luminous with log Lx/Lbol - -3.27. Possible mechanisms to account for these two phenomena are discussed. Finally, we infer that the binary may be in thermal oscillation or may evolve into a contact binary. 1RXS J201607.0+251645 is identified as an eclipsing binary. We present preliminary observations in the V band with the 0.6-m telescope for three years and extensive observations in the V and R bands with the 0.8-m telescope for six nights, respectively. The light curve of the system is E13 type. Five light minimum times were obtained and the orbital period of 0.388058^d(±0.00044d) is determined. The photometric solution given by the 2003-version of the Wilson-Devinney program suggests that the binary is a semidetached system with photometric mass ratio 0.895(±0.006), which is probably comprised of a G5 primary and an oversized K5 secondary. The tess massive component has completely filled its Roche lobe, while the other one almost fills its Roche lobe with a filling factor of 93.4%. The system shows a varying O'Connell effect in its phase folded diagrams from 2005 to 2007, and is X-ray luminous with log Lx/Lbol - -3.27. Possible mechanisms to account for these two phenomena are discussed. Finally, we infer that the binary may be in thermal oscillation or may evolve into a contact binary.
出处 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2009年第9期1035-1048,共14页 天文和天体物理学研究(英文版)
基金 Supported by the National Natural Science Foundation of China(Grant Nos.10778707 and 10473013)
关键词 stars: binaries: close -- stars: binaries: eclipsing -- stars: individual: 1RXSJ201607.0+251645 HD 339946 stars: binaries: close -- stars: binaries: eclipsing -- stars: individual: 1RXSJ201607.0+251645, HD 339946
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参考文献11

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