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Astron. Astrophys. 325, 542-550 (1997)

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Cold dust around Herbig-Haro energy sources: morphology and new protostellar candidates

R. Chini 1, Bo Reipurth 2, A. Sievers 3, D.Ward-Thompson 4, C.G.T. Haslam 5, E. Kreysa 5 and R. Lemke 6

1 Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstr.150/NA 7, D-44780 Bochum, Germany
2 European Southern Observatory, Casilla 19001, Santiago 19, Chile
3 IRAM, Avda Divina Pastora 7, Nucleo Central, E-18012 Granada, Spain
4 Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
5 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
6 Onsala Space Observatory, S-43992 Onsala, Sweden

Received 23 December 1996 / Accepted 20 April 1997

Abstract

We present 1300 µm maps of regions centered on the energy sources of 20 HH objects in order to study the distribution of circumstellar matter around these young stellar objects. The data show that the emission generally originates from a rather compact region which is embedded in a more diffuse environment. The relative contribution of the compact component to the total emission varies from 15 to 100%. About half of the compact components appear spherically symmetric while the other half displays an elongated structure. There is, however, no correlation between the optical jet axis and the flattened dust structures, indicating that collimation occurs on smaller scales. Close to the energy source of HH 114 we discovered a so far unknown mm-source with [FORMULA] suggesting that it is still in its early protostellar evolutionary stage. In three other regions we detected similar unknown mm-sources without IRAS counterparts, indicating that they are also likely new protostellar candidates.

Key words: interstellar medium: dust – stars: circumstellar matter – formation of

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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