Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs
Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs
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原始极低质量恒星和褐矮星 - III。
DOI：
10.1093/mnras/sty1352
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发表时间：
--
影响因子：
4.8
通讯作者：
Zhang (???) Z
中科院分区：
文献类型：
--
作者：
Zhang (???) Z
We report the discovery of an esdL3 subdwarf, ULAS J020858.62+020657.0, and a usdL4.5 subdwarf, ULAS J230711.01+014447.1. They were identified as L subdwarfs by optical spectra obtained with the Gran Telescopio Canarias, and followed up by optical-to-near-infrared spectroscopy with the Very Large Telescope. We also obtained an optical-to-near-infrared spectrum of a previously known L subdwarf, ULAS J135058.85+081506.8, and reclassified it as a usdL3 subdwarf. These three objects all have typical halo kinematics. They haveTeffaround 2050–2250 K, −1.8 ≤ [Fe/H] ≤ −1.5, and mass around 0.0822–0.0833 M⊙, according to model spectral fitting and evolutionary models. These sources are likely halo transitional brown dwarfs with unsteady hydrogen fusion, as their masses are just below the hydrogen-burning minimum mass, which is ∼ 0.0845 M⊙at [Fe/H] = −1.6 and ∼ 0.0855 M⊙at [Fe/H] = −1.8. Including these, there are now nine objects in the ‘halo brown dwarf transition zone’, which is a ‘substellar subdwarf gap’ that spans a wide temperature range within a narrow mass range of the substellar population.
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DOI：
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发表时间：
1996
期刊：
影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
2004
期刊：
影响因子：
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DOI：
10.1086/425418
发表时间：
2004
期刊：
The Astrophysical Journal Letters
影响因子：
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作者：
A. Burgasser
通讯作者：
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DOI：
10.1086/510148
发表时间：
2006
期刊：
The Astrophysical Journal
影响因子：
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作者：
A. Burgasser;K. Cruz;J. Kirkpatrick
通讯作者：
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DOI：
10.1088/0004-6256/147/5/94
发表时间：
2013
期刊：
The Astronomical Journal
影响因子：
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作者：
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通讯作者：
J. Subasavage