Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..539p&link_type=abstract
Astronomy and Astrophysics, v.378, p.539-545 (2001)
Astronomy and Astrophysics
Astrophysics
19
Techniques: Interferometric, Stars: Individual: S140 Irs3, Stars: Formation, Stars: Winds, Outflows
Scientific paper
We explore the structures immediately surrounding the high-mass young stellar object S140 IRS 3 within the L1204 molecular cloud. We have obtained a bispectrum speckle interferometric K-band image with a resolution of 150 mas and a seeing-limited molecular hydrogen line emission image of IRS 3. Our speckle image resolves IRS 3 into three point sources, a close binary with separation 0.63'' and a third component 1.3'' away. A rough assessment of the system stability suggests that the IRS 3 triple system is unstable. Our speckle image also reveals extended diffuse emission of very complex morphology around IRS 3. An extended diffuse feature north-east of IRS 3 displays a remarkable sf S-shaped structure. This feature is the innermost part of an at least 15'' long extended structure, which is pointing towards a bow-shock like patch located 90'' away from IRS 3. We find strong H_2 line emission associated with this feature, suggesting the presence of shocks, caused by the collision of outflowing material with the ambient medium. The sf S-shaped structure of this feature can be well reproduced by a model assuming a precessing outflow from IRS 3a. Furthermore, we find several elongated features pointing away from IRS 3 in a southern direction. Some of these features also exhibit strong H_2 line emission, demonstrating that IRS 3 drives outflows in several directions. Part of the results presented in this paper are based on observations obtained at the German-Spanish Astronomical Centre, Calar Alto, operated by the Max-Planck-Institute for Astronomy, Heidelberg, jointly with the Spanish National Commission for Astronomy. The speckle observations were collected at the Special Astrophysical Observatory with the 6 m telecope.
Balega Yuri Yu.
Preibisch Th.
Schertl Dieter
Smith Masson D.
Weigelt Gerd
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