UV Excess Measures of Accretion onto Young Very Low Mass Stars and Brown Dwarfs

Low-resolution spectra from 3000 to 9000 Aa of young low-mass stars and brown dwarfs were obtained with LRIS on Keck I. The excess UV and optical emission arising in the Balmer and Paschen continua yields mass accretion rates ranging from [image] to 10 super(-8) M sub([image]) yr super(-1). These re...

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Bibliographic Details
Published in:The Astrophysical journal 2008-07, Vol.681 (1), p.594-625
Main Authors: Herczeg, Gregory J, Hillenbrand, Lynne A
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
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Summary:Low-resolution spectra from 3000 to 9000 Aa of young low-mass stars and brown dwarfs were obtained with LRIS on Keck I. The excess UV and optical emission arising in the Balmer and Paschen continua yields mass accretion rates ranging from [image] to 10 super(-8) M sub([image]) yr super(-1). These results are compared with HST STIS spectra of roughly solar-mass accretors with accretion rates that range from [image] to [image] M sub([image]) yr super(-1). The weak photospheric emission from M dwarfs at
ISSN:0004-637X
1538-4357
DOI:10.1086/586728