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Preprint 14b/99

RXTE Monitoring of LMC X-3

Jörn Wilms (1), Michael A. Nowak (2), Katja Pottschmidt (1), William A. Heindl (3), James B. Dove (4), Mitchell C. Begelman (2;5), and Rüdiger Staubert (1)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) JILA, University of Colorado, Boulder, CO 80309-440, USA
(3) CASS, University of California San Diego, La Jolla, CA 92093, USA
(4) Dept. of Physics, Metropolitan State College of Denver, Denver, CO 80217-3362, USA
(5) APS, University of Colorado, Boulder 80309, U.S.A.

To appear in: ESO Workshop on Black Holes, eds. L. Kaper et al., Springer

Abstract. We present results from an RXTE monitoring campaign of the black hole candidate LMC X-3 since 1996 December. The spectral properties of this canonical soft state source show considerable variability on timescales of ~100 d. We report on these changes, including on two or possibly three instances where we found that the soft spectral component vanishes and where the X-ray spectrum of LMC X-3 resembles that of a hard state source such as Cyg X-1.

Key words:

Paper (25k gzip'ed Postscript including figures)

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