The Substellar Component of the Orion Dispersed Population

Details The Substellar Component of the Orion Dispersed Population The Substellar Component of the Orion Dispersed Population

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35...60d&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Stars: Low Mass, Brown Dwarf, Stars: Formation, Stars: Pre-Main Sequence

Scientific paper

We present the initial results of a large-scale optical-near infrared survey to detect very low mass stars and brown dwarfs in the dispersed populations of the Orion star forming region. Using deep optical photometry, infrared photometry from 2MASS survey and optical spectra from the Hectospec spectrograph, we confirmed 22 new members, 6 of which are bonna fide brown dwarfs. Our findings indicate that at ages of about endtex2html[d]eferred3 Myr the number of accretors in very low mass stars and brown dwarfs is similar to that derived for low-mass pre-main sequence stars and that the overall number of accretors, both in low-mass stars and among very low mass stars and brown dwarfs, falls off by a significant amount at ages ˜ 8-10 Myr, supporting the idea of a common formation scenario for VLMS and BD.

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