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EXOSAT Medium Energy Observations of CYG X-2 Spectra and QPOs

Published online by Cambridge University Press:  12 April 2016

L. Chiappetti ,
A.L. Ciapi ,
L. Maraschi ,
L. Stella ,
E.G. Tanzi  and
A. Treves
L. Chiappetti
Affiliation:
Istituto di Fisica Cosmica, CNR, Milano, Italy
A.L. Ciapi
Affiliation:
Departimento di Fisica dell’Universita’, Milano, Italy
L. Maraschi
Affiliation:
Departimento di Fisica dell’Universita’, Milano, Italy
L. Stella
Affiliation:
EXOSAT Observatory, ESOC, Darmstadt, F.R.G.
E.G. Tanzi
Affiliation:
Istituto di Fisica Cosmica, CNR, Milano, Italy
A. Treves
Affiliation:
Departimento di Fisica dell’Universita’, Milano, Italy

Abstract

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He report on a series of observations of Cyg X-2 obtained with EXOSAT in September 1983 at five phases in a single orbital cycle (P = 9.8 days, see Cowley et al. 1979). Here we present spectral data obtained with the Argon counters of the Medium. Energy experiment (HE) (see Turner et al. 1981), together with the search of Quasi Periodic Oscillations (QPOs) in high tine resolution data.

Type
VII. Related Objects
Information
International Astronomical Union Colloquium , Volume 93: Cataclysmic Variables: Recent Multi-Frequency Observations and Theoretical Developments , 1987 , pp. 691 - 695
Copyright
Copyright © Reidel 1987

References

Cowley, A.P., Crampton, D. & Hutchings, J.B., 1979, Ap.J., 231, 539 Google Scholar
Hasinger, G. et al. 1986, Nature, 319, 469.Google Scholar
Turner, M.J.L., Smith, A. & Zimmermann, M.U., 1981, Space Sci. Rev., 30, 513 Google Scholar
White, N.E. & Hason, K.O., 1985, Space Sci. Rev., 40, 167 Google Scholar