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Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs. / Zhang, Z. H.; Pinfield, D. J.; Galvez-Ortiz, M. C.; Homeier, D.; Burgasser, A. J.; Lodieu, N.; Martin, E. L.; Osorio, M. R. Zapatero; Allard, F.; Jones, H. R. A.; Smart, R. L.; Marti, B. Lopez; Burningham, B.; Rebolo, R.

In: Monthly Notices of the Royal Astronomical Society, Vol. 479, No. 1, 01.09.2018, p. 1383–1391.

Research output: Contribution to journalArticle

Harvard

Zhang, ZH, Pinfield, DJ, Galvez-Ortiz, MC, Homeier, D, Burgasser, AJ, Lodieu, N, Martin, EL, Osorio, MRZ, Allard, F, Jones, HRA, Smart, RL, Marti, BL, Burningham, B & Rebolo, R 2018, 'Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs', Monthly Notices of the Royal Astronomical Society, vol. 479, no. 1, pp. 1383–1391. https://doi.org/10.1093/mnras/sty1352

APA

Zhang, Z. H., Pinfield, D. J., Galvez-Ortiz, M. C., Homeier, D., Burgasser, A. J., Lodieu, N., Martin, E. L., Osorio, M. R. Z., Allard, F., Jones, H. R. A., Smart, R. L., Marti, B. L., Burningham, B., & Rebolo, R. (2018). Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs. Monthly Notices of the Royal Astronomical Society, 479(1), 1383–1391. https://doi.org/10.1093/mnras/sty1352

Vancouver

Author

Zhang, Z. H. ; Pinfield, D. J. ; Galvez-Ortiz, M. C. ; Homeier, D. ; Burgasser, A. J. ; Lodieu, N. ; Martin, E. L. ; Osorio, M. R. Zapatero ; Allard, F. ; Jones, H. R. A. ; Smart, R. L. ; Marti, B. Lopez ; Burningham, B. ; Rebolo, R. / Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 479, No. 1. pp. 1383–1391.

Bibtex

@article{e63db9a475db4334b226fe53dbc73ed9,
title = "Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs",
abstract = " 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 re-classified it as a usdL3 subdwarf. These three objects all have typical halo kinematics. They have $T_{\rm eff}$ around 2050-2250 K, $-$1.8 $\leq$ [Fe/H] $\leq -$1.5, and mass around 0.0822-0.0833 M$_{\odot}$, according to model spectral fitting and evolutionary models. These sources are likely halo transitional brown dwarfs with unsteady hydrogen fusions, as their masses are just below the hydrogen-burning minimum mass, which is $\sim$ 0.0845 M$_{\odot}$ at [Fe/H] = $-$1.6 and $\sim$ 0.0855 M$_{\odot}$ 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' spans a wide temperature range within a narrow mass range of the substellar population. ",
keywords = "astro-ph.SR",
author = "Zhang, {Z. H.} and Pinfield, {D. J.} and Galvez-Ortiz, {M. C.} and D. Homeier and Burgasser, {A. J.} and N. Lodieu and Martin, {E. L.} and Osorio, {M. R. Zapatero} and F. Allard and Jones, {H. R. A.} and Smart, {R. L.} and Marti, {B. Lopez} and B. Burningham and R. Rebolo",
note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. {\textcopyright} 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. ",
year = "2018",
month = sep,
day = "1",
doi = "10.1093/mnras/sty1352",
language = "English",
volume = "479",
pages = "1383–1391",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs

AU - Zhang, Z. H.

AU - Pinfield, D. J.

AU - Galvez-Ortiz, M. C.

AU - Homeier, D.

AU - Burgasser, A. J.

AU - Lodieu, N.

AU - Martin, E. L.

AU - Osorio, M. R. Zapatero

AU - Allard, F.

AU - Jones, H. R. A.

AU - Smart, R. L.

AU - Marti, B. Lopez

AU - Burningham, B.

AU - Rebolo, R.

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - 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 re-classified it as a usdL3 subdwarf. These three objects all have typical halo kinematics. They have $T_{\rm eff}$ around 2050-2250 K, $-$1.8 $\leq$ [Fe/H] $\leq -$1.5, and mass around 0.0822-0.0833 M$_{\odot}$, according to model spectral fitting and evolutionary models. These sources are likely halo transitional brown dwarfs with unsteady hydrogen fusions, as their masses are just below the hydrogen-burning minimum mass, which is $\sim$ 0.0845 M$_{\odot}$ at [Fe/H] = $-$1.6 and $\sim$ 0.0855 M$_{\odot}$ 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' spans a wide temperature range within a narrow mass range of the substellar population.

AB - 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 re-classified it as a usdL3 subdwarf. These three objects all have typical halo kinematics. They have $T_{\rm eff}$ around 2050-2250 K, $-$1.8 $\leq$ [Fe/H] $\leq -$1.5, and mass around 0.0822-0.0833 M$_{\odot}$, according to model spectral fitting and evolutionary models. These sources are likely halo transitional brown dwarfs with unsteady hydrogen fusions, as their masses are just below the hydrogen-burning minimum mass, which is $\sim$ 0.0845 M$_{\odot}$ at [Fe/H] = $-$1.6 and $\sim$ 0.0855 M$_{\odot}$ 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' spans a wide temperature range within a narrow mass range of the substellar population.

KW - astro-ph.SR

U2 - 10.1093/mnras/sty1352

DO - 10.1093/mnras/sty1352

M3 - Article

VL - 479

SP - 1383

EP - 1391

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -