Models of Collapsing Clouds and Star-Forming Regions as Analogs of the Solar Nebula

Details Models of Collapsing Clouds and Star-Forming Regions as Analogs of the Solar Nebula Models of Collapsing Clouds and Star-Forming Regions as Analogs of the Solar Nebula

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..504c&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

Stars form inside gas and dust condensations within molecular clouds called dense cores. These objects are observed throughout our Galaxy but particular attention is devoted to nearby (<200pc) dense coresideal targets to carry out detailed studies with available telescopes. About one half of nearby dense cores are starless and a small (~ 5%) fraction is thought to be on the verge of star formation with evidences of contraction motions and centrally concentrated density profiles. Any information on the physical and chemical structure of these ""prestellar"" cores will provide clues on the conditions driving star formation and on the material composition out of which stars circumstellar disks planets and comets will form. I will review recent observational and theoretical progress on prestellar cores pointing out the importance of molecular freeze out for their chemical and dynamical evolution. The central few thousands AU of prestellar cores are almost entirely deprived of gas phase molecular species (with the exception of H and D compounds). This is consistent with the existence of a central high density zone where dust grains are covered with thick ice mantles. Such mantles facilitate grain coagulation and probably represent the first steps toward the formation of large solid bodies.

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