Publications
of the
MPIfR Optical & Infrared Interferometry Group

G. Weigelt, T. Preibisch, D. Schertl, Y. Balega, and M.D. Smith:

Bispectrum speckle interferometry of the massive protostellar object S140 IRS 1:
Evidence for Multiple Outflows

Astronomische Gesellschaft Abstract Series (AGM 18, P21)
Five Days of Creation: Astronomy with Large Telescopes from Ground and Space
Annual Scientific Meeting of the Astronomische Gesellschaft at the Joint European and National Meeting JENAM 2001 of the European Astronomical Society and the Astronomische Gesellschaft, Sep 10-15, 2001, Munich, Germany

Abstract. Bispectrum speckle interferometry is emplyed to explore the deeply embedded young stellar object S140 IRS 1 and its environment. Diffraction-limited resolution of 76 mas (~70 AU), a dynamical range of more than 8 mag, and a field of view of 13'' x 21'' in K'-band images were achieved with the SAO 6 m telescope. Our image reveals a wealth of previously unseen complex structures. In addition to a bright, elongated, and very clumpy feature pointing from the central source to the south-east, 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 structures around IRS 1 seem to trace the interaction of energetic outflows from IRS 1 with the circumstellar material. In combination with molecular line emission maps from the literature, our image provides evidence for the presence of two distinct bipolar outflow systems. A system of three arc-like structures north-east of IRS 1 suggests directional variability of the outflow, perhaps caused by the precession of a jet- or wind-driven outflow. We discuss the implications for the nature of the central source.

bloecker@mpifr-bonn.mpg.de.
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