Astron. Astrophys. 347, 518-523 (1999)

X-ray and radio observations of RX J1826.2-1450/LS 5039

M. Ribó ¹, P. Reig ^2,3, J. Martí ⁴ and J.M. Paredes <sup>1

1</sup> Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
² Physics Department, University of Crete, P.O. Box 2208, GR-71003, Heraklion, Greece
³ Foundation for Research and Technology-Hellas, GR-71110, Heraklion, Crete, Greece
⁴ Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, Calle Virgen de la Cabeza, 2, E-23071 Jaén, Spain

Received 10 February 1999 / Accepted 19 May 1999

Abstract

RX J1826.2-1450/LS 5039 has been recently proposed to be a radio emitting high mass X-ray binary. In this paper, we present an analysis of its X-ray timing and spectroscopic properties using different instruments on board the RXTE satellite. The timing analysis indicates the absence of pulsed or periodic emission on time scales of 0.02-2000 s and 2-200 d, respectively. The source spectrum is well represented by a power-law model, plus a Gaussian component describing a strong iron line at 6.6 keV. Significant emission is seen up to 30 keV, and no exponential cut-off at high energy is required. We also study the radio properties of the system according to the GBI-NASA Monitoring Program. RX J1826.2-1450/LS 5039 continues to display moderate radio variability with a clearly non-thermal spectral index. No strong radio outbursts have been detected after several months.

Key words: stars: individual: RX J1826.2-1450; LS 5039; NVSS J182614-145054 stars: variables: general radio continuum: stars X-rays: stars

Send offprint requests to: M. Ribó (mribo@mizar.am.ub.es)

© European Southern Observatory (ESO) 1999

Online publication: June 30, 1999

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