A&A 398, 571-581 (2003)
DOI: 10.1051/0004-6361:20021411

Far infrared observations of pre-protostellar sources in Lynds 183

K. Lehtinen¹, K. Mattila¹, D. Lemke², M. Juvela¹, T. Prusti³ and R. Laureijs<sup>4

1</sup>  Observatory, Tähtitorninmäki, PO Box 14, 00014 University of Helsinki, Finland
²  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
³  ESTEC/SCI-SAF, Postbus 299, 2200 AG Noordwijk, The Netherlands
⁴  ISO Data Centre, ESA Satellite Tracking Station, Villafranca del Castillo, PO Box 50727, 28080 Madrid, Spain

(Received 15 March 2002 / Accepted 24 September 2002 )

Abstract
Using ISOPHOT maps at 100 and 200  m and raster scans at 100, 120, 150 and 200  m we have detected four unresolved far-infrared sources in the high latitude molecular cloud L 183. Two of the sources are identified with 1.3 mm continuum sources found by Ward-Thompson et al. (1994, 2000) and are located near the temperature minimum and the coincident column density maximum of dust distribution. For these two sources, the ISO observations have enabled us to derive temperatures (~ 8.3 K) and masses (~1.4 and 2.4 ). They are found to have masses greater than or comparable to their virial masses and are thus expected to undergo gravitational collapse. We classify them as pre-protostellar sources. The two new sources are good candidates for pre-protostellar sources or protostars within L 183.

Key words: stars: formation -- ISM: clouds -- dust, extinction -- ISM: individual objects: Lynds 183 -- ISM: individual objects: Lynds 134N -- infrared: ISM

Offprint request: K. Lehtinen, kimmo.lehtinen@helsinki.fi

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