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Issue A&A
Volume 369, Number 1, April I 2001
Page(s) 155 - 169
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010097



A&A 369, 155-169 (2001)
DOI: 10.1051/0004-6361:20010097

Mm/Submm images of Herbig-Haro energy sources and candidate protostars

R. Chini1, D. Ward-Thompson2, J. M. Kirk2, M. Nielbock1, B. Reipurth3 and A. Sievers4

1  Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstr. 150/NA 7, 44780 Bochum, Germany
2  Department of Physics and Astronomy, Cardiff University, PO Box 913, Cardiff, UK
3  CASA, University of Colorado, CB 389, Boulder, CO 80309, USA
4  IRAM, Avda. Divina Pastora 7, Nucleo Central, 18012 Granada, Spain

(Received 19 September 2000 / Accepted 11 January 2001)

Abstract
We present 450, 850 $\mu$m and 1300 $\mu$m images of regions with embedded candidate protostars. Some of them are associated with HH objects (HH 7-11, HH 1-2, HH 147, HH 111, HH 108) and have been previously identified in the course of a 1300 $\mu$m survey. Other regions were taken from the IRAS PSC (04239+2436, 04368+2557, 20050+2720, 20386+6751, 22134+5834, 23011+6126). The new mm/submm images show the detailed structure of the regions some of which contain new compact sources as well as extended emission features. The inferred mm/submm fluxes are combined with IRAS data in order to derive the temperature of the associated dust, its mass and the re-radiated luminosity. Taking the ratio of FIR-to-submm luminosity as an indicator for the evolutionary stage, we find that 15 out of 17 sources have $L_{\rm FIR}/L_{\rm smm} < 200$, indicating that most objects are probably genuine protostars. For the first time, we detect dust emission associated with HH objects themselves, H2 and CO flows which we interpret as density enhancements swept up by the ejected material.


Key words: interstellar medium: dust -- stars: circumstellar matter -- formation

Offprint request: R. Chini, chini@astro.ruhr-uni-bochum.de

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© ESO 2001


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