Volume 408, Number 1, September II 2003
|Page(s)||245 - 256|
|Section||Interstellar and circumstellar matter|
|Published online||17 November 2003|
The stellar content of OMC 2/3*
Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstrasse 159/NA 7, 44780 Bochum, Germany
2 SEST, European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile
Corresponding author: M. Nielbock, firstname.lastname@example.org
Accepted: 17 June 2003
We have revisited the stellar content of OMC 2 and OMC 3 by means of MIR imaging and NIR photometry; in addition, we have extended the existing (sub)mm maps by a huge m map obtained with SIMBA showing new sources and filamentary features for the first time at that wavelength. The MIR data reveal 43 new sources at N and Q which are partly associated with dense condensations at millimetre wavelengths. Six close binary sources could be resolved at locations where existing (sub)mm maps only show single emission peaks; three of them are classified as early (B-type) systems, one of them is compatible with type K while the remaining two seem to be T Tauri stars. Furthermore, the MIR images indicate the existence of separate circumstellar discs in the K-binary system. NIR colour–colour and colour–magnitude diagrams obtained from 2MASS data are examined to explore the physical properties of the sources and to derive the distribution of J luminosities. There is a clear decrease in luminosity and thus in stellar mass when going from South to North. Likewise, there is an anti-correlation between Class I and II objects in both regions: while OMC 2 contains twice as much Class II objects compared to Class I, the situation is reversed in OMC 3.
Key words: ISM: dust / stars: circumstellar matter, formation
© ESO, 2003
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