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Multiwavelength observations of the Be-star/X-ray binary EXO2030+375 during outburst

Published online by Cambridge University Press:  26 May 2016

A.J. Norton ,
M.J. Coe ,
C. Everall ,
P. Roche ,
L. Bildsten ,
D. Chakrabarty ,
T.A. Prince ,
M.T. Stollberg  and
R.B. Wilson
A.J. Norton
Affiliation:
Dept. of Physics, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
M.J. Coe
Affiliation:
Astronomy & Space Physics Group, Univ. of Southampton, Southampton SO9 5NH, UK
C. Everall
Affiliation:
Astronomy & Space Physics Group, Univ. of Southampton, Southampton SO9 5NH, UK
P. Roche
Affiliation:
Astronomy & Space Physics Group, Univ. of Southampton, Southampton SO9 5NH, UK
L. Bildsten
Affiliation:
Division of Physics, Mathematics & Astronomy, Caltech, Pasadena, CA 91125, USA
D. Chakrabarty
Affiliation:
Division of Physics, Mathematics & Astronomy, Caltech, Pasadena, CA 91125, USA
T.A. Prince
Affiliation:
Division of Physics, Mathematics & Astronomy, Caltech, Pasadena, CA 91125, USA
M.T. Stollberg
Affiliation:
Department of Physics, University of Alabama, Huntsville, AL 35809, USA
R.B. Wilson
Affiliation:
Space Sciences Lab., NASA Marshall Space Flight Center, Huntsville, AL 35812, USA

Extract

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EXO2030+375 consists of a neutron star in an eccentric 46 day orbit around a 20th magnitude Be-star companion (Coe et al., 1988; Parmar et al., 1989; Stollberg et al., 1993). The Be-star is thought to be surrounded by a shell/disc of material which is responsible for the infrared excess and Balmer emission lines which are characteristic of Be-stars in general. At periastron, the neutron star passes through this circumstellar material, giving rise to enhanced accretion onto the neutron star surface. As a result of this, the X-ray emission (pulsed at the neutron star spin period of 41.8s) increases dramatically, so producing the transient, outburst behaviour which is commonly seen in Be-star / X-ray binaries.

Type
3. X-Ray Observations
Information
Symposium - International Astronomical Union , Volume 162: Pulsation, Rotation and Mass Loss in Early-Type Stars , 1994 , pp. 206 - 207
Copyright
Copyright © Kluwer 1994 

References

Coe, M.J., Longmore, A., Payne, B.J. and Hanson, C.G.: 1988, MNRAS 232, 865 CrossRefGoogle Scholar
Parmar, A.N., White, N.E., Stella, L., Izzo, C. & Ferri, P.: 1989, ApJ 338, 359 CrossRefGoogle Scholar
Stollberg, M.T. et al.: 1993, ‘BATSE Observations of EXO2030+375’ in Friedlander, , Gehrels, & Macomb, , ed(s)., CGRO Symposium, St. Louis , AIP Conf. Proc. 280, 371 CrossRefGoogle Scholar