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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358633.0, MPI für Astronomie / Publikationen_mpia
Unveiling the nature and interaction of the intermediate/high-mass YSOs in IRAS 20343+4129
Authors:Palau, A.; Estalella, R.; Ho, P. T. P.; Beuther, H.; Beltrán, M. T.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Astronomy and Astrophysics
Start Page:911
End Page:922
Audience:Not Specified
Abstract / Description:Context: IRAS 20343+4129 was suggested to harbor one of the most massive and embedded stars in the Cygnus OB2 association, IRS 1, which seemed to be associated with a north-south molecular outflow. However, the dust emission peaks do not coincide with the position of IRS 1, but lie on either side of another massive Young Stellar Object (YSO), IRS 3, which is associated with centimeter emission. Aims: The goal of this work is to elucidate the nature of IRS 1 and IRS 3, and study their interactions with the surrounding medium. Methods: The Submillimeter Array (SMA) was used to observe with high angular resolution the 1.3 mm continuum and CO (2-1) emission of the region, and we compared this millimeter emission with the infrared emission from 2MASS. Results: Faint millimeter dust continuum emission was detected toward IRS 1, and we derived an associated gas mass of ~0.8 Mo. The IRS 1 Spectral Energy Distribution (SED) agrees with IRS 1 being an intermediate-mass Class I source of about 1000 Lo, whose circumstellar material is producing the observed large infrared excess. We have discovered a high-velocity CO (2-1) bipolar outflow in the east-west direction, which is clearly associated with IRS 1. Its outflow parameters are similar to those of intermediate-mass YSOs. Associated with the blue large-scale CO (2-1) outflow lobe, detected with single-dish observations, we only found two elongated low-velocity structures on either side of IRS 3. The large-scale outflow lobe is almost completely resolved out by the SMA. Our detected low-velocity CO structures are coincident with elongated H2 emission features. The strongest millimeter continuum condensations in the region are found on either side of IRS 3, where the infrared emission is extremely weak. The
Free Keywords:stars: formation; ISM: individual objects: IRAS 20343+4129; ISM: dust; extinction; ISM: clouds
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie

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