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Accretion in Very Low Mass Young Objects

Published online by Cambridge University Press:  26 May 2016

James Muzerolle ,
Lynne Hillenbrand ,
César Briceño ,
Nuria Calvet  and
Lee Hartmann
James Muzerolle
Affiliation:
Steward Observatory, 933 N. Cherry Ave., University of Arizona, Tucson, AZ 85721
Lynne Hillenbrand
Affiliation:
Dept. of Astronomy, MS105–24, California Institute of Technology, Pasadena, CA 91125
César Briceño
Affiliation:
CIDA, Apartado Postal 264, Mérida 5101–A, Venezuela
Nuria Calvet
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
Lee Hartmann
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138

Abstract

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We have investigated evidence for active accretion in a sample of ~ 30 young, very low mass objects, including at least 10 brown dwarfs. About 30% of the sample exhibits broad, asymmetric Hα emission line profiles, indicative of gas accretion via magnetospheric infall. There is a distinct lack of associated optical continuum veiling in these accretors, suggesting very low mass accretion rates. Our models yield an upper limit to the accretion rates that is several orders of magnitude smaller than typical of higher-mass T Tauri stars, suggesting a dependence of accretion rates with stellar mass.

Type
Part 3. Circumsubstellar Matter
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 141 - 142
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Muzerolle, J., Briceño, C., Calvet, N., Hartmann, L., Hillenbrand, L., & Gullbring, E. 2000, ApJ, 545, L141 Google Scholar
Muzerolle, J., Calvet, N., & Hartmann, L 2001, ApJ, 550, 944 CrossRefGoogle Scholar