EDP Sciences
Free Access
Volume 381, Number 3, January III 2002
Page(s) 905 - 913
Section Formation, structure and evolution of stars
DOI https://doi.org/10.1051/0004-6361:20011562
Published online 15 January 2002

A&A 381, 905-913 (2002)
DOI: 10.1051/0004-6361:20011562

Bispectrum speckle interferometry of the massive protostellar object S140 IRS 1: Evidence for multiple outflows

G. Weigelt1, Y. Y. Balega2, T. Preibisch1, D. Schertl1 and M. D. Smith3

1  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2  Special Astrophysical Observatory, Nizhnij Arkhyz, Zelenchuk region, Karachai-Cherkesia, 357147, Russia
3  Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland

(Received 26 July 2001 / Accepted 18 October 2001)

Bispectrum speckle interferometry is employed to explore the immediate environment of the deeply embedded young stellar object S140 IRS 1. A K'-band (2.0-2.3 $\,\mu$m) diffraction-limited resolution of 76 mas (~70 AU) is achieved with the SAO 6 m telescope, as well as a dynamical range of more than 8 mag and a field of view of $13'' \times 21''$. Our image exhibits many previously unseen complex structures. In addition to the bright, elongated, and very clumpy feature pointing from the central source to the south-east, which was already discussed in a previous paper (Schertl et al. 2000), we find several arc-like structures north-east of IRS 1, extended diffuse emission south of IRS 1, and four new point sources. The diffuse and fragmentary structures close to IRS 1 appear to trace circumstellar material swept up by energetic outflows. In combination with molecular line emission maps from the literature, our image provides direct confirmation that two distinct bipolar outflow systems continue to be driven from IRS 1 on scales between 3´´ and 100´´. A system of three arc-like structures to the north-east is consistent with cavities excavated by a precessing jet or wind-driven outflow. We discuss the implications for the nature of the central source.

Key words: techniques: interferometric -- stars: individual: S140 IRS1 -- stars: formation

Offprint request: G. Weigelt, weigelt@mpifr-bonn.mpg.de

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© ESO 2002

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