Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..249m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 249-254.
Astronomy and Astrophysics
Astronomy
40
Astronomical Maps, Radio Astronomy, Stellar Magnetic Fields, Very Long Base Interferometry, X Ray Binaries, Continuous Spectra, High Resolution, Stellar Flares
Scientific paper
VLBI observations of the X-ray binary LSI+61 deg 303 have been performed at 6 cm wavelength by using the European VLBI Network (EVN) and the VLA. The observations were carried out near a maximum of the source periodic (26.5 d) radio outburst. The source has been detected with a S/N above 7 on all the baselines, with a total flux density of 200 mJy. The map of the source reveals two components, separated by 0.9 mas. The overall size of the source, at a level of 50 percent of peak intensity, is about 1.6 x 1.0 mas. The values derived from the data for the magnetic field and energy content are consistent with an adiabatic expansion model of a synchrotron emitting source with prolonged injection of energetic particles. Part of the delay between the radio outburst and the passage at the periastron can be explained in terms of absorption in the inner part of the primary ionized wind.
Estalella Robert
Felli Marcello
Massi Maria
Paredes Javier M.
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