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EUV Constraints on Models of Low Mass X-Ray Binaries

Published online by Cambridge University Press:  12 April 2016

D.J. Christian ,
J.E. Edelstein ,
M. Mathioudakis ,
K. McDonald  and
M.M. Sirk
D.J. Christian
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge St. Berkeley, CA, 94720-5030, USA
J.E. Edelstein
Affiliation:
Department of Astronomy, Space Sciences Lab., University of California Berkeley, 94720, USA
M. Mathioudakis
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge St. Berkeley, CA, 94720-5030, USA
K. McDonald
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge St. Berkeley, CA, 94720-5030, USA
M.M. Sirk
Affiliation:
Center for EUV Astrophysics, 2150 Kittredge St. Berkeley, CA, 94720-5030, USA

Abstract

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We present EUVE survey results for moderate column directions containing known low-mass X-ray binaries (LMXB). We derive Lexan band (100 Å) count rates and upper limits for nearly 40 LMXB chosen generally with EB-V ≤ 0.3. Detections include Sco X-1, Her X-1, and the GRO transient CJ0422+32. Super soft sources in the LMC yield 3 σ upper limits of ≤ 10 counts ks−1. The extrapolation of two component spectral models (such as blackbody plus thermal bremsstrahlung), are in agreement with the survey upper limits. Contemporary LMXB spectral models, which involve Comptonization in an inner disk corona, predict a large flux of EUV photons. If the above model is correct in the EUV, such a component could be detected in source with low column densities. We argue that additional intrasystem column hampers its detection.

Type
VIII. Novae, X-ray Binaries
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 425 - 429
Copyright
Copyright © Kluwer 1996

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