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Astron. Astrophys. 357, 507-514 (2000)


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Exploring the high frequency emission of radio loud X-ray binaries

J.M. Paredes 1, J. Martí 2, M. Peracaula 3,1, G. Pooley 4 and I.F. Mirabel 5,6

1 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain
2 Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, Calle Virgen de la Cabeza 2, 23071 Jaén, Spain
3 Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, T2N IN4, Canada
4 Mullard Radio Astronomy Observatory, Cavendish Laboratory, Cambridge, UK
5 CEA/DSM/DAPNIA/Service d'Astrophysique, Centre d'Études de Saclay, F-91191 Gif-Sur-Yvette, France
6 Instituto de Astronomía y Física del Espacio, C.C. 67, Suc. 28, 1428 Buenos Aires, Argentina

Received 25 May 1999 / Accepted 31 January 2000

Abstract

We report millimetre-wave continuum observations of the X-ray binaries Cygnus X-3, SS 433, LSI+61o303, Cygnus X-1 and GRS 1915+105. The observations were carried out with the IRAM 30 m-antenna at 250 GHz (1.25 mm) from 1998 March 14 to March 20. These millimetre measurements are complemented with centimetre observations from the Ryle Telescope, at 15 GHz (2.0 cm), and from the Green Bank Interferometer at 2.25 and 8.3 GHz (13 and 3.6 cm). Both Cygnus X-3 and SS 433 underwent moderate flaring events during our observations, whose main spectral evolution properties are described and interpreted. A significant spectral steepening was observed in both sources during the flare decay, that is likely to be caused by adiabatic expansion, inverse Compton and synchrotron losses. Finally, we also report 250 GHz upper limits for three additional undetected X-ray binary stars: LSI+65o010, LSI+61o235 and X Per.

Key words: radio continuum: stars – stars: individual: Cygnus X-3 – stars: individual: Cygnus X-1 – stars: individual: GRS 1915+105 – stars: individual: LSI+61O 303 – stars: individual: SS 433

Send offprint requests to: J.M. Paredes (josepmp@mizar.am.ub.es)

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000

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