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K. L. Luhman et al. 2003 ApJ 590 348 doi:10.1086/374983

New Low-Mass Members of the Taurus Star-forming Region*

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K. L. Luhman1, César Briceño2, John R. Stauffer3, Lee Hartmann4, D. Barrado y Navascués5 and Nelson Caldwell6

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Abstract References Cited By

Briceño et al. recently used optical imaging, data from the Two-Micron All-Sky Survey (2MASS), and follow-up spectroscopy to search for young low-mass stars and brown dwarfs in 8 deg2 of the Taurus star-forming region. By the end of that study, there remained candidate members of Taurus that lacked the spectroscopic observations needed to measure spectral types and determine membership. In this work, we have obtained spectroscopy of the 22 candidates that have AV ≤ 8, from which we find six new Taurus members with spectral types of M2.75 through M9. The new M9 source has the second latest spectral type of the known members of Taurus (~0.02 Msun). Its spectrum contains extremely strong emission in Hα (Wλ ~ 950 Å), as well as emission in He I 6678 Å and the Ca II IR triplet. This is the least massive object known to exhibit emission in He I and Ca II, which together with the strong Hα are suggestive of intense accretion.


Footnote
*  Based on observations obtained at the Kitt Peak National Observatory, Keck Observatory, Fred Lawrence Whipple Observatory, and the MMT Observatory. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
Subject headings

infrared: stars; stars: evolution; stars: formation; stars: low-mass, brown dwarfs; stars: luminosity function, mass function; stars: pre-main sequence


Dates

Issue 1 (2003 June 10)

Received 2003 January 16, accepted for publication 2003 February 25



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