A very young star forming region detected by the ISOPHOT serendipity survey

O. Krause, D. Lemke, L. V. Tóth, U. Klaas, M. Haas, M. Stickel, R. Vavrek

Research output: Contribution to journalReview article

14 Citations (Scopus)


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 M) 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 M) 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 M, II) a gravitationally bound, cold (T ∼ 12 K) and dense (n(H2) ∼ 2 × 105 cm-3) cloud core with a mass of 50 M and III a Herbig B2 star with a mass of 6.5 M and a bolometric luminosity of 2200 L, 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%.

Original languageEnglish
Pages (from-to)1007-1020
Number of pages14
JournalAstronomy and Astrophysics
Issue number3
Publication statusPublished - Feb 2003



  • ISM: clouds
  • ISM: dust, extinction
  • ISM: individual objects: ISOSS J 20298+3559
  • Stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this