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Issue A&A
Volume 477, Number 1, January I 2008
Page(s) 267 - 272
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20078070



A&A 477, 267-272 (2008)
DOI: 10.1051/0004-6361:20078070

A 1.3 cm wavelength radio flare from a deeply embedded source in the Orion BN/KL region

J. Forbrich1, 2, K. M. Menten1, and M. J. Reid2

1  Max-Planck-Institut für Radioastronomie, Auf dem Hügel, 53121 Bonn, Germany
    e-mail: jforbrich@cfa.harvard.edu
2  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA

(Received 12 June 2007 / Accepted 2 November 2007 )

Abstract
Aims.Our aim was to measure and characterize the short-wavelength radio emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the BN/KL star-forming region.
Methods.We used the NRAO Very Large Array at a wavelength of $\lambda=1.3$ cm and we studied archival X-ray, infrared, and radio data.
Results.During our observation, a strong outburst (flux increasing >10 fold) occurred in one of the 16 sources detected at $\lambda=1.3$ cm, while the others remained (nearly) constant. This source does not have an infrared counterpart, but has subsequently been observed to flare in X-rays. Curiously, a very weak variable double radio source was found at other epochs near this position, one of whose components is coincident with it. A very high extinction derived from modeling the X-ray emission and the absence of an infrared counterpart both suggest that this source is very deeply embedded.


Key words: stars: pre-main sequence -- radio continuum: stars



© ESO 2007


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