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Study of dynamical processes at early stages of stellar evolution using contemporary millimeter wave receiving technologies

Ziel

The main goal of the project is to investigate in detail processes in the neighbourhood of young stellar objects (YSO). They include outflows, accretion and even the development of protostellar discs. In particular, the interaction of the outflows with the surrounding material will be studied both observationally and theoretically. In addition, the characteristics of the outflows themselves will be investigated. An observational programme to search for protostellar disks and collapsing objects will be performed. In order to improve the efficiency of millimetre wave observations some technical developments are planned, in particular a prototype multi-beam 3 mm receiver with a multi-channel acousto-optical spectrometer for the 22 m telescope in Crimea. In parallel, a multi-beam system for the 20 m telescope in Onsala will be developed.

The research will be performed by means of multi-line millimetre and sub millimetre wave spectroscopic observations of a carefully selected sample of outflow sources. The observations will include mapping in various lines and high-quality measurements of the line profiles in search for the signs of outflows, rotation, accretion and small-scale clumsiness. These observations will be performed with large single-dish telescopes as well as with interferometers. The data analysis will be based on the numerical modelling of the radiative transfer using the Monte Carlo and other computer codes developed in the participating groups.

Special attention will be paid to the spatial distribution of different molecular species and transitions tracing different constituents and their dynamics in the molecular material surrounding YSO's. Studies of the line profiles in comparison with the predictions of theoretical models will be used for choosing the most appropriate model of a shocked region and to identify protostellar disk candidates. Dynamical and thermal structure of the interface region between the accretion disk and stellar outflow will be thoroughly investigated.

Comparison of positions of strong methanol masers with methanol abundant regions producing thermal lines will be used to investigate the origin of the masers and to understand which parts of the YSO environment are traced by the exciting maser phenomenon (in particular, using the European VLBI network).

Evolutionary status of dense clumps surrounding YSO will be elucidated on the basis of the analysis of the molecular abundances and source kinematics.

The outcome of the research programme is a detailed picture of shocks produced by massive newly born stars. This picture contains knowledge of the structure, dynamics, thermodynamic properties and chemical composition of the regions where stellar winds and protostellar outflows interact with the surrounding dense molecular gas.

Prototype multi-beam front-ends (focal plane arrays) will be built on the basis of single-beam SIS receivers which are at the disposal of the participating groups by combining technical experience and efforts of these groups. An acousto-optical spectrometer for use with a multi-beam focal plane array will be developed

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Koordinator

CHALMERS UNIVERSITY OF TECHNOLOGY
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439 92 ONSALA
Schweden

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Beteiligte (7)

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Letzte Aktualisierung: 30 Oktober 2002

Mein Booklet

Permalink: https://cordis.europa.eu/project/id/INTAS-1999-01667/de

European Union, 2024