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The evolution of inner disk radius with orbital phase in Circinus X-1

Published online by Cambridge University Press:  21 February 2013

Yanan Wang ,
Guoqiang Ding  and
Chunping Huang
Yanan Wang
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150, Science 1-Street, Urumqi, Xinjiang 830011, China email: wangyanan@xao.ac.cn, dinggq@gmail.com University of Chinese Academy of Sciences, China
Guoqiang Ding
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150, Science 1-Street, Urumqi, Xinjiang 830011, China email: wangyanan@xao.ac.cn, dinggq@gmail.com
Chunping Huang
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150, Science 1-Street, Urumqi, Xinjiang 830011, China email: wangyanan@xao.ac.cn, dinggq@gmail.com University of Chinese Academy of Sciences, China
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Abstract

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Using RXTE observations, we investigate the evolution of inner disk radius (Rin) of Cir X-1 during two cycles and find obvious orbital modulation. We argue that the modulation is attributed to its high orbital eccentricity. The disk luminosity is inversely with the inner disk temperature (kTin), which is ascribed to the slow increase of kTin and, however, the rapid decrease of Rin during the passage for the neutron star to depart from the companion star.

Keywords

Compact objectNeutron starAccretion diskCircinus X-1
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 337 - 338
Copyright
Copyright © International Astronomical Union 2013

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