Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..775b&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
Star Formation, Young Stars, Variability, Photometry
Scientific paper
In an area of ˜ 25 ° we have unveiled new populations of low-mass young stars, from young (˜ 2 Myr) regions in dense molecular clouds like Orion OB 1b, to older (˜ 10 Myr) areas devoid of gas and dust like the sparse OB 1a subassociation. The newly identified young stars are spatially coincident with the high mass O, B and A stars, indicating that little, if any, mass segregation has occured. The absence of dust and gas in Ori OB 1a suggests that star formation is a rapid process, and that molecular clouds do not last more than a few million years after the first stars are born. The lack of accretion indicators or near IR emission from inner dusty disks in Ori OB 1a region suggests that significant disk dissipation has occured in a few Myr, possibly due to the coagulation/agglomeration of dust particles into larger bodies like planetesimals or planets.
Briceno Cesar
Calvet Nuria
Hartmann Lee
Vivas Katherina A.
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