EDP Sciences
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Volume 418, Number 1, April IV 2004
Page(s) 271 - 274
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20035886

A&A 418, 271-274 (2004)
DOI: 10.1051/0004-6361:20035886

Optical CCD photometry of the microquasar LS 5039

J. Martí1, P. Luque-Escamilla2, J. L. Garrido1, J. M. Paredes3 and R. Zamanov4

1  Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, Virgen de la Cabeza 2, 23071 Jaén, Spain
    e-mail: jlg@ujaen.es
2  Departamento de Ingeniería Mecánica y Minera, Escuela Universitaria Politécnica de Linares, Universidad de Jaén, C/ Alfonso X el Sabio 28, 23700 Linares, Spain
    e-mail: peter@ujaen.es
3  Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain
    e-mail: jmparedes@ub.edu
4  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead, CH41 1LD, UK
    e-mail: rz@astro.livjm.ac.uk

(Received 16 December 2003 / Accepted 15 January 2004 )

We report optical CCD observations of the microquasar LS 5039. Its photometric behaviour is studied over different orbital periods with a time separation of three years. We do not detect evidences of an ellipsoidal modulation above the $\pm0.01$ mag level, thus confirming the previous results reported by Clark et al. (2001). The light curve of LS 5039 has also been explored with a time resolution of 30 s but the source also appears to be stable on such shorter time scales. Possible scenarios consistent with the non-detection of optical variability are considered.

Key words: stars: individual: LS 5039 ( RX J1826.2-1450 ) -- X-rays: binaries -- radio continuum: stars

Offprint request: J. Martí, jmarti@ujaen.es

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