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Astron. Astrophys. 332, 561-568 (1998)

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Phase-resolved spectroscopy of the low-mass X-ray binaries 1636-536/V 801 Arae and 1735-444/V 926 Scorpii *

T. Augusteijn 1, 2, F. van der Hooft 2, J.A. de Jong 2, M.H. van Kerkwijk 2, 4 and J. van Paradijs 2, 3

1 European Southern Observatory, Casilla 19001, Santiago 19, Chile
2 Astronomical Institute "Anton Pannekoek", University of Amsterdam and Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
3 Physics Department University of Huntsville in Alabama, Huntsville, AL 35899, USA
4 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK

Received 3 October 1997 / Accepted 12 December 1997


We present phase-resolved spectroscopy of the optical counterparts V 801 Ara and V 926 Sco of the low-mass X-ray binaries 1636-536 and 1735-444. To assist in the interpretation of the spectroscopic observations we derive new ephemerides for the photometric variations of both sources. Superior conjunction of the line emission region occurs at photometric phase [FORMULA] 0.7 in both sources, which indicates that these variations are dominated by a component originating from the point where the mass stream from the donor star intersects the outer disk. We find that the properties of 1636-536/V 801 Ara and 1735-444/V 926 Sco are very similar.

Key words: accretion, accretion disks – X-rays: stars – stars: individual: V 801 Ara – stars: individual: V 926 Sco – stars: neutron

* Based on observations made at the European Southern Observatory, La Silla, Chile

Send offprint requests to: T. Augusteijn

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© European Southern Observatory (ESO) 1998

Online publication: March 23, 1998