Issue |
A&A
Volume 391, Number 2, August IV 2002
|
|
---|---|---|
Page(s) | 609 - 615 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20020878 | |
Published online | 02 August 2002 |
The origin of the radio emission from β Lyrae
1
Istituto di Radioastronomia del C.N.R., Stazione VLBI di Noto, C.P. 161 Noto, Italy
2
INAF, Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania, Italy
Corresponding author: G. Umana, umana@ira.noto.cnr.it
Received:
5
October
2001
Accepted:
15
May
2002
In this paper we present new observational evidence
that supports the presence of an extra source of continuum emission in the
binary system β Lyrae.
New VLA and IRAM observations, together with published data from the literature and
ISO archive data, allow us to build the Spectral Energy Distribution of the
binary between Hz and
Hz.
The radio-millimeter part of the spectrum is consistent with free-free
emission from a symbiotic-like wind associated with the primary component
and ionized by the radiation field of the hidden companion.
Furthermore, we also consider the possibility that the observed radio flux originates from collimated radio structures associated with the mass gaining component
and its disk (Conical thermal jets).
An extrapolation of this emission to the far-IR part of the spectrum
indicates that in both cases the free-free contribution at these frequencies cannot explain the observations and that the observed
infrared excess flux is due principally to the secondary component and its
associated disk.
Key words: stars: binaries: eclipsing / stars: individual: β Lyrae / radio continuum: stars
© ESO, 2002
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