Computer Science – Performance
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.......159p&link_type=abstract
PhD Thesis, Kapteyn Astronomical Institute, Groningen, The Netherlands, 1992.
Computer Science
Performance
10
Scientific paper
My thesis consists of seven infrared studies of low mass star formation. One chapter describes an all sky survey of young stars in the IRAS Point Source Catalog (IPSC). Three chapters contain studies of the Chamaeleon I star forming region. Two chapters concern star formation in the Chamaeleon II molecular cloud. Finally, one chapter deals with star formation in B209, which is a globule in the Taurus clouds. I will summarize the results of these studies in the above mentioned four categories. Advanced statistical classification methods have been used to extract a set of 5962 young stellar object candidates from the IPSC. In the selection procedure clustering properties on the sky were used in addition to the usually explored IRAS colours. A performance analysis indicates that in low mass star forming regions 87% of these objects are indeed young stars. All IRAS catalogues (IPSC, IRAS Serendipitous Survey Catalog and IRAS Faint Source Survey) have been searched for young stars born in the Chamaeleon I molecular cloud. These studies have led to the discovery of the exciting source of Herbig-Haro objects 49 and 50. Ground-based near-infrared photometry has been obtained for a majority of Chamaeleon I members in order to construct spectral energy distributions. Bolometric luminosities have been estimated for 62 out of the 81 known members to construct a luminosity function (LF). A comparison of the LF with that of the ρ Ophiuchi infrared cluster suggests that star formation has evolved further in Chamaelon I. Young stars in the Chamaeleon II star forming region have been measured in the near infrared and IRAS data has been extracted in order to construct spectral energy distributions and luminosity estimates. An additional search based on the IRAS data has been performed to find new young stellar object candidates. The spatial distribution of young stars and candidate members shows that star formation is more widespread in Chamaelon II than in the well-studied Chamaeleon I. A study of star formation in B209 revealed two new embedded sources belonging to the group of young stars born in the Taurus region. This result from a small area of the whole cloud complex suggests that our current sample of embedded objects in Taurus may be severely incomplete. One of the new objects is of sub-solar luminosity, but yet it drives a relatively strong molecular outflow. It is possible that the known sample of luminous embedded sources exciting molecular outflows has a large number of low luminosity counterparts, which are extremely difficult to discover. The embedded sources may thus have a similar kind of luminosity function as the T Tauri stars making them physically more similar to pre-main-sequence stars than to protostars. (If interested in a personal copy of my thesis, please, contact the above mentioned E-mail address.)
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