EDP Sciences
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Volume 418, Number 3, May II 2004
Page(s) 1045 - 1050
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20035923

A&A 418, 1045-1050 (2004)
DOI: 10.1051/0004-6361:20035923

Synchrotron emission from circumstellar disks around massive stars

Y. A. Shchekinov1, 2 and A. M. Sobolev3

1  Department of Physics, Rostov State University, Rostov on Don 344090, Russia
2  Isaac Newton Institute of Chile, Rostov on Don Branch, Russia
3  Astronomical Observatory, Ural State University, Ekaterinburg 620083, Russia
    e-mail: Andrej.Sobolev@usu.ru

(Received 20 December 2003 / Accepted 13 February 2004 )

We argue that the interaction of stellar wind with the surface of a circumstellar accretion (or protoplanetary) disk can result in the acceleration of relativistic electrons in an external layer of the disk, and produce synchrotron radiation. Conservative estimates give a total synchrotron luminosity $L_{\rm s}\sim
10^{-5}~L_\odot$ for a central star with $\dot M=10^{-6}~M_\odot$ yr -1, comparable with the value observed around the TW object in the W3(OH) region.

Key words: accretion, accretion disks -- stars: circumstellar matter -- acceleration of particles

Offprint request: Y. A. Shchekinov, yus@phys.rsu.ru

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