2002/02/19 by Cesar Briceño, Nuria Calvet, Briceño, Cesar +6
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0202350
3 pages, 2 Figures, LaTeX (style and macro file included). To appear in Proceedings of the X Latin American Regional Meeting of the IAU, to be published by Revista Mexicana de Astronomia y Astrofisica, Conference Series, 2002
arxiv created 2002/02/19 · arxiv updated 2009/12/01
We present recent results from our ongoing large scale variability survey of the Orion OB1 Association. In an area of ~ 25 square degrees we have unveiled new populations of low-mass young stars over a range of environments, and ages from 1-2 Myr in Ori OB 1b to roughly 10 Myr in Ori OB 1a. There is a lack of strong Ha emission and near-IR excesses in the young stars of Ori OB 1a, suggesting that accretion stops and disks dissipate for most solar type stars in a few Myr, probably caused by of the onset of planet formation. The absence of dust and gas in Ori OB 1a is consistent with the picture of star formation as a rapid process, in which molecular clouds dissipate in just a few Myr after the first stars are born.