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Changes in Cyclotron line energy with luminosity in Accreting X-ray pulsars

Published online by Cambridge University Press:  21 February 2013

Osamu Nishimura
Osamu Nishimura*
Affiliation:
Nagano National College of Technology716 Tokuma Nagano, Japan email: nishi@nagano-nct.ac.jp
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Abstract

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I model changes in cyclotron line energy with luminosity, considering the effect of polar cap dimensions and changes in beam pattern as well as shock height. Cyclotron lines are calculated by a superposition of a large number of cyclotron lines formed in different heights of an accretion column. Cyclotron line energy has been observed to change with luminosity in a number of accreting X-ray pulsars. In X0115+63 and V0332+53, the fundamental cyclotron line energy has been observed to decrease with increasing luminosity. This phenomenon has been interpreted as a change in shock height with luminosity. However, the rate of the change seems to be very different, in which the line energy in V0332+53 seems to vary slowly with luminosity compared with that in X0115+63. I found that the changes in the cyclotron line energies with luminosity can be explained by changes in beam pattern and the size of a polar cap rather than a shock height.

Keywords

cyclotron lineneutron starmagnetic field
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 283 - 284
Copyright
Copyright © International Astronomical Union 2013

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