Volume 398, Number 3, February II 2003
|Page(s)||1007 - 1020|
|Section||Interstellar and circumstellar matter|
|Published online||28 January 2003|
A very young star forming region detected by the ISOPHOT Serendipity Survey *
Max–Planck–Institut für Astronomie (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
Corresponding author: O. Krause, firstname.lastname@example.org
Accepted: 12 September 2002
We present a multi-wavelength study of the star forming region ISOSS J 20298+3559, which was identified by a cross-correlation of cold compact sources from the 170 μm ISOPHOT Serendipity Survey (ISOSS) database coinciding with objects detected by the MSX, 2MASS and IRAS infrared surveys. ISOSS J 20298+3559 is associated with a massive dark cloud complex (M ~ 760 ) and located in the Cygnus X giant molecular cloud. We derive a distance of 1800 pc on the basis of optical extinction data. The low average dust temperature (T ~ 16 K) and large mass (M ~ 120 ) of the dense inner part of the cloud, which has not been dispersed, indicates a recent begin of star formation. The youth of the region is supported by the early evolutionary stage of several pre- and protostellar objects discovered across the region: I) two candidate Class 0 objects with masses of 8 and 3.5 , II) a gravitationally bound, cold (T ~ 12 K) and dense (n(H2) ~ 2 105 cm-3) cloud core with a mass of 50 and III) a Herbig B2 star with a mass of 6.5 and a bolometric luminosity of 2200 , showing evidence for ongoing accretion and a stellar age of less than 40 000 years. The dereddened SED of the Herbig star is well reproduced by an accretion disc + star model. The externally-heated cold cloud core is a good candidate for a massive pre-protostellar object. The star formation efficiency in the central cloud region is about 14%.
Key words: stars: formation / ISM: dust, extinction / ISM: clouds / ISM: individual objects: ISOSS J 20298+3559
Based on observations with the James-Clerk-Maxwell Telescope JCMT, the IRAM 30 m Telescope, the United Kingdom Infrared Telescope UKIRT, the MPIfR 100 m Telescope, the Calar Alto Observatory and the Infrared Space Observatory ISO, an ESA project funded by Member States (especially France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.
© ESO, 2003
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