Publications
of the
MPIfR Optical & Infrared Interferometry Group

T. Preibisch, D. Schertl, G. Weigelt, Y. Balega

Bispectrum speckle interferometry of young jet- and outflow-sources

Astronomische Gesellschaft Abstract Series (AGM 19, C02)
Der kosmische Materiekreislauf
Annual Scientific Meeting of the Astronomische Gesellschaft, Sep 23-28, 2002, Berlin, Germany

Abstract

The mechanisms by which the jets and outflows from young stellar objects are generated, accelerated, and collimated are still not well understood. For a better understanding of the underlying physical processes it is important to look as close as possible to the disk/star boundary, where the jets and outflows are thought to be launched. Therefore, high-spatial resolution observations are of crucial importance for further progress in this field.

In this contribution we will present recent results from our near-infrared bispectrum speckle interferometry observations of outflow sources, including S140 IRS, R Mon, and Mon R2 IRS 3. With a spatial resolution of up to 0.055'', our data represent the highest resolution images obtained so far for these objects and exhibit previously unseen complex structures. In the case of S140, our results provide evidence for the existence of two distinct bipolar outflow systems originating simultaneously from the protostar IRS 1 and a remarkable precessing jet from IRS 3. We will also discuss our results for the other targets and the relation of the observed circumstellar structures to the jets and outflows from the young stellar objects.