New Low‐Mass Members of the Taurus Star‐forming Region | Zendy

K. L. Luhman | Zendy; César Briceño | Zendy; J. R. Stauffer | Zendy; Lee Hartmann | Zendy; D. Barrado | Zendy; Nelson Caldwell | Zendy

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New Low‐Mass Members of the Taurus Star‐forming Region

Author(s) -

K. L. Luhman,

César Briceño,

J. R. Stauffer,

Lee Hartmann,

D. Barrado,

Nelson Caldwell

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/374983

Subject(s) - astrophysics , physics , spectroscopy , stars , stellar classification , sky , brown dwarf , star (game theory) , accretion (finance) , emission spectrum , low mass , accretion disc , astronomy , spectral line

Briceno et al. recently used optical imaging, data from the Two-MicronAll-Sky Survey (2MASS), and follow-up spectroscopy to search for young low-massstars and brown dwarfs in 8 square degrees of the Taurus star-forming region.By the end of that study, there remained candidate members of Taurus thatlacked the spectroscopic observations needed to measure spectral types anddetermine membership. In this work, we have obtained spectroscopy of the 22candidates that have A_V<=8, from which we find six new Taurus members withspectral types of M2.75 through M9. The new M9 source has the second latestspectral type of the known members of Taurus (~0.02 M_sun). Its spectrumcontains extremely strong emission in H_alpha (W~950 A) as well as emission inHe I 6678 A and the Ca II IR triplet. This is the least massive object known toexhibit emission in He I and Ca II, which together with the strong H_alpha aresuggestive of intense accretion.

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