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Temporal Behaviour of Sources in the ROSAT Extreme-Ultraviolet All-Sky Survey

Published online by Cambridge University Press:  12 April 2016

Paul McGale ,
J.P. Pye ,
C.R. Barber  and
C.G. Page
Paul McGale
Affiliation:
X-Ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH
J.P. Pye
Affiliation:
X-Ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH
C.R. Barber
Affiliation:
X-Ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH
C.G. Page
Affiliation:
X-Ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH

Abstract

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From a total catalogue of 479 2RE sources, 31 have been found to be variable. All the variable sources are optically identified, with a breakdown by source type as follows: cataclysmic variables 9, late-type (F-M) stars 18, the high-mass X-ray binary Her X-1, the eclipsing binaries Algol and V471 Tau, and the active galaxy Mkn 478. The most highly variable objects in the EUV band are cataclysmic variables. The survey was sensitive to timescales from ~ 1.5 h to ~ 5 d, and observed variability ranges from flare-like events lasting < 1.5 h to irregular and periodic flux changes over ~ 0.5–2 d. With the exception of the cataclysmic variables, and possibly a few late-type dK-dMe stars with large flares, the observed variability levels should not substantially affect EUV luminosity functions

Type
I. Summaries of Recent Missions
Information
International Astronomical Union Colloquium , Volume 152: Astrophysics in the Extreme Ultraviolet , 1996 , pp. 15 - 19
Copyright
Copyright © Kluwer 1996

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