Other
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt........40s&link_type=abstract
PhD Thesis, Catania University, 2006
Other
Stars:Low-Mass, Brown Dwarfs, Star: Formation, Stars: Pre-Main Sequence, Ism: Clouds, Ism: Individual Objects: Chamaeleon Ii
Scientific paper
An important issue for the understanding of the star and planet formation process is the determination of the Initial Mass Function (IMF), in particular in the very low-mass and sub-stellar regimes, where recent investigations give controversial results. In this work optical wide-field imaging observations in the Chamaeleon II dark cloud (Cha II), together with near-infrared measurements from the 2 Micron All Sky Survey (2MASS), have been used to search for low-mass Pre-Main Sequence (PMS) stars and young brown dwarfs (BDs) and study the IMF in this region down to the substellar regime. Using the wide-field imager (WFI) at the ESO 2.2m telescope, we surveyed a sky area of about 1.75 square degrees in Cha II. The region was observed in the R, I and z broad bands, in two Halpha filters, narrow (Halpha_7) and wide (Halpha_12), and in two medium-band filters centered at 856 and 914 nm. These data are being used as complementary data to those of The Spitzer Legacy survey: "From Molecular Cores to Planet Forming Disks" (c2d) in Cha II, that aims at studying the process of star and planet formation from the earliest stages of molecular cores to the epoch of planet-forming disks. We provide a complete physical characterization of the confirmed stellar population of Cha II down to the very low-mass end. This study shows that the Cha II members confirmed so far have ages between 2 an 5 Myr and the cloud preferentially forms very low-mass stars (0.3-0.6 solar masses), being the star formation efficiency 2-3%. The first determination of the Cha II IMF in the low-mass stars regime (0.1
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