New low-mass members of the Taurus star-forming region

K. L. Luhman; César Briceño; John R. Stauffer; Lee Hartmann; D. Barrado y Navascués; Nelson Caldwel

doi:10.1086/374983

New low-mass members of the Taurus star-forming region

K. L. Luhman, César Briceño, John R. Stauffer, Lee Hartmann, D. Barrado y Navascués, Nelson Caldwel

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Abstract

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 A_V ≤ 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 M⊙). Its spectrum contains extremely strong emission in Ha (W _λ ∼ 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 Ha are suggestive of intense accretion.

Original language	English (US)
Pages (from-to)	348-356
Number of pages	9
Journal	Astrophysical Journal
Volume	590
Issue number	1 I
DOIs	https://doi.org/10.1086/374983
State	Published - Jun 10 2003

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/374983

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@article{0c830ec8ec6a43db9d1d635fb755ee8b,

title = "New low-mass members of the Taurus star-forming region",

abstract = "Brice{\~n}o 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 M⊙). Its spectrum contains extremely strong emission in Ha (W λ ∼ 950 {\AA}), as well as emission in He I 6678 {\AA} 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 Ha are suggestive of intense accretion.",

author = "Luhman, {K. L.} and C{\'e}sar Brice{\~n}o and Stauffer, {John R.} and Lee Hartmann and {Barrado y Navascu{\'e}s}, D. and Nelson Caldwel",

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doi = "10.1086/374983",

language = "English (US)",

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T1 - New low-mass members of the Taurus star-forming region

AU - Luhman, K. L.

AU - Briceño, César

AU - Stauffer, John R.

AU - Hartmann, Lee

AU - Barrado y Navascués, D.

AU - Caldwel, Nelson

PY - 2003/6/10

Y1 - 2003/6/10

N2 - 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 M⊙). Its spectrum contains extremely strong emission in Ha (W λ ∼ 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 Ha are suggestive of intense accretion.

AB - 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 M⊙). Its spectrum contains extremely strong emission in Ha (W λ ∼ 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 Ha are suggestive of intense accretion.

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JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

New low-mass members of the Taurus star-forming region

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