Looking for very low-mass pre-main sequence objects with SDSS

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Determining the process(es) by which brown dwarfs form is key to understanding their intrinsic nature. If their origins are within circumstellar disks they are akin to giant planets. If, on the other hand, they coalesce from molecular cloud cores, then they share a common lineage with low mass stars. These two mechanisms can be distinguished by investigation of young (< 10 Myr) substellar objects. If brown dwarfs are small failed stars, we expect to find very low mass analogs of the Classical T Tauris, with primordial magnetic fields from the molecular cloud collapse. Accretion onto these objects leads to characteristic ... continued below

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2 p.

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Hawley, Suzanne L.,; Covey, K. R. (Kevin R.) & McGehee, P. M. (Peregrine M.) January 1, 2001.

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Determining the process(es) by which brown dwarfs form is key to understanding their intrinsic nature. If their origins are within circumstellar disks they are akin to giant planets. If, on the other hand, they coalesce from molecular cloud cores, then they share a common lineage with low mass stars. These two mechanisms can be distinguished by investigation of young (< 10 Myr) substellar objects. If brown dwarfs are small failed stars, we expect to find very low mass analogs of the Classical T Tauris, with primordial magnetic fields from the molecular cloud collapse. Accretion onto these objects leads to characteristic magnetic activity signatures such as chromospheric and coronal emission resulting in an ultraviolet excess continuum. The Orion OB1b association (m-M = 7.9, 2 Myr) provides a laboratory for following the strength and occurrence of the accretion process as a function of mass. Studies of the substellar mass function within the sigma Orionis cluster at the southern end of the association indicate that brown dwarfs are common. Based on model isochrones and the SDSS M dwarf sequence we expect the 95% completeness limit of the 'Orion' scans to correspond to 0.1 and 0.03 solar masses for the u and g bands.

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2 p.

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  • Submitted to: Proceedings of International Astronomical Union Symposium 211: Brown Dwarfs

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  • Report No.: LA-UR-02-4700
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976237
  • Archival Resource Key: ark:/67531/metadc928451

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  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:18 p.m.

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Hawley, Suzanne L.,; Covey, K. R. (Kevin R.) & McGehee, P. M. (Peregrine M.). Looking for very low-mass pre-main sequence objects with SDSS, article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc928451/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.