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Spectral Evolution of the Thermal Component in Cygnus X-1 during Intensity Variations in the Soft State

Published online by Cambridge University Press:  25 May 2016

M. Balucinska-Church ,
M. J. Church ,
K. Mitsuda ,
T. Dotani ,
H. Inoue  and
F. Nagase
M. Balucinska-Church
Affiliation:
University of Birmingham, Birmingham B15 2TT, UK
M. J. Church
Affiliation:
University of Birmingham, Birmingham B15 2TT, UK
K. Mitsuda
Affiliation:
ISAS, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, Japan
T. Dotani
Affiliation:
ISAS, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, Japan
H. Inoue
Affiliation:
ISAS, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, Japan
F. Nagase
Affiliation:
ISAS, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, Japan

Extract

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Cygnus X-1 was in the Soft State between May and September 1996 for the first time in more than 20 years creating an opportunity to study the thermal component, its spectral evolution, time variability and its relation to the hard component during intensity variations. We will show how the luminosity of the thermal component changes in relation to its temperature and attempt to determine whether the emitting area varied during the variations.

Type
Session 3: Diagnostics of High Gravity Objects with X- and Gamma Rays
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 390 - 391
Copyright
Copyright © Kluwer 1998 

References

Bałucińska-Church, M., Belloni, T., Church, M. J. and Hasinger, G., 1995, A&A 302, L5.Google Scholar
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Narayan, R., 1997, in: “Accretion Phenomena and Related Outflows”, IAU Colloqium no. 163, eds.: Wickramasinghe, D. T., Ferrario, L. and Bicknell, G. V..Google Scholar