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Astron. Astrophys. 350, 197-203 (1999)


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Outflow and disk around the very young massive star GH2O 092.67+03.07

J.P. Bernard 1, K. Dobashi 2 and M. Momose 3

1 Institut d'Astrophysique Spatiale, bât 121, Campus d'Orsay, F-91405 Orsay Cedex, France
2 Department of Astronomy and Earth Sciences, Tokyo Gakugei University, Koganei 184-8501, Tokyo, Japan
3 Nobeyama Radio Observatory, National Astronomical Observatory, Nobeyama, Minamisaku, Nagano 384-1305, Japan

Received 6 October 1998 / Accepted 9 June 1999

Abstract

We present CS(J=2-1) interferometric observations obtained with the Nobeyama Millimeter Array (NMA) toward a protostar ([FORMULA]) in the Cygnus OB7 giant molecular cloud (distance=800 pc). The data clearly indicate the presence of a compact (size [FORMULA]) and young outflow with dynamical time scale [FORMULA] year. The outflow is surrounded by a massive gas condensation. The analysis of the gas dynamics shows the signature of an infalling and rotating disk, which could be the first clear detection of such motion around a young high mass star. Single dish data obtained with the Nobeyama 45m antenna in several molecular lines are used to derive the CS abundance and the optical depth of the CS(J=2-1) toward [FORMULA]. We derive a total mass of [FORMULA] and [FORMULA] for the outflow and disk respectively. The comparison of the NMA data with a simple model of infalling disk indicates a mass of the central object in the range [FORMULA].

We propose that [FORMULA] is a dust condensation in the very early steps of forming a high mass star.

Key words: ISM: clouds – ISM: jets and outflows – stars: formation – stars: individual: GH2O 092.67+03.07

Send offprint requests to: J.P. Bernard (bernard@ias.fr)

© European Southern Observatory (ESO) 1999

Online publication: September 24, 1999

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