Coordinated EXOSAT and optical observations of the X-ray burster 4U1735-44 |
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| Authors: | A P Smale R H D Corbet P A Charles J W Menzies P Mack |
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| Institution: | (1) Department of Astrophysics, University of Oxford, South Parks Road, OX1 3RQ Oxford, UK;(2) South African Astronomical Observatory, P.O. Box 9, 7935, South Africa |
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| Abstract: | We present the first results of an EXOSAT observation of the low-mass X-ray burster 4U1735-44. The ME data show low-amplitude variations in the persistent flux including two 5% dips separated by  4 hours. The structure of the single observed burst is briefly described. Five hours of simultaneous B-band photometry were obtained at SAAO with 12 minute time resolution; a strong anti-correlation is shown to exist between the X-ray and optical flux, with a high level of significance. A model for this behaviour is suggested, based on reprocessing of the X-ray flux in a corona or stellar wind. |
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