AB Doradus C: Age, spectral type, orbit, and comparison to evolutionary models

E. L. Nielsen; L. M. Close; J. C. Guirado; B. A. Biller; R. Lenzen; W. Brandner; M. Hartung; C. Lidman

doi:10.1002/asna.200510442

AB Doradus C: Age, spectral type, orbit, and comparison to evolutionary models

E. L. Nielsen, L. M. Close, J. C. Guirado, B. A. Biller, R. Lenzen, W. Brandner, M. Hartung, C. Lidman

Astronomy

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26 Scopus citations

Abstract

We expand upon the results of Close et al. (2005) regarding the young, low-mass object AB Dor C and its role as a calibration point for theoretical tracks. We present an improved spectral reduction and a new orbital solution with two additional epochs. Our improved analysis confirms our spectral type of M8 (± 1) and mass of 0.090 ± 0.003 M_⊙ for AB Dor C. Comparing the results for AB Dor C with other young, low-mass objects with dynamical masses we find a general trend where current evolutionary models tend to over-predict the temperature (or under-predict the mass) for low-mass stars and brown dwarfs. Given our precision, there is a ∼99% chance that the mass of AB Dor C is underestimated by the DUSTY tracks in the HR diagram.

Original language	English (US)
Pages (from-to)	1033-1039
Number of pages	7
Journal	Astronomische Nachrichten
Volume	326
Issue number	10
DOIs	https://doi.org/10.1002/asna.200510442
State	Published - 2005

Keywords

Brown dwarfs
Infrared: stars
Stars: formation
Stars: individual (AB Dor)
Stars: low-mass
Stars: pre-main sequence

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1002/asna.200510442

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title = "AB Doradus C: Age, spectral type, orbit, and comparison to evolutionary models",

abstract = "We expand upon the results of Close et al. (2005) regarding the young, low-mass object AB Dor C and its role as a calibration point for theoretical tracks. We present an improved spectral reduction and a new orbital solution with two additional epochs. Our improved analysis confirms our spectral type of M8 (± 1) and mass of 0.090 ± 0.003 M⊙ for AB Dor C. Comparing the results for AB Dor C with other young, low-mass objects with dynamical masses we find a general trend where current evolutionary models tend to over-predict the temperature (or under-predict the mass) for low-mass stars and brown dwarfs. Given our precision, there is a ∼99% chance that the mass of AB Dor C is underestimated by the DUSTY tracks in the HR diagram.",

keywords = "Brown dwarfs, Infrared: stars, Stars: formation, Stars: individual (AB Dor), Stars: low-mass, Stars: pre-main sequence",

author = "Nielsen, {E. L.} and Close, {L. M.} and Guirado, {J. C.} and Biller, {B. A.} and R. Lenzen and W. Brandner and M. Hartung and C. Lidman",

year = "2005",

doi = "10.1002/asna.200510442",

language = "English (US)",

volume = "326",

pages = "1033--1039",

journal = "Astronomische Nachrichten",

issn = "0004-6337",

publisher = "Wiley-VCH Verlag",

number = "10",

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TY - JOUR

T1 - AB Doradus C

T2 - Age, spectral type, orbit, and comparison to evolutionary models

AU - Nielsen, E. L.

AU - Close, L. M.

AU - Guirado, J. C.

AU - Biller, B. A.

AU - Lenzen, R.

AU - Brandner, W.

AU - Hartung, M.

AU - Lidman, C.

PY - 2005

Y1 - 2005

N2 - We expand upon the results of Close et al. (2005) regarding the young, low-mass object AB Dor C and its role as a calibration point for theoretical tracks. We present an improved spectral reduction and a new orbital solution with two additional epochs. Our improved analysis confirms our spectral type of M8 (± 1) and mass of 0.090 ± 0.003 M⊙ for AB Dor C. Comparing the results for AB Dor C with other young, low-mass objects with dynamical masses we find a general trend where current evolutionary models tend to over-predict the temperature (or under-predict the mass) for low-mass stars and brown dwarfs. Given our precision, there is a ∼99% chance that the mass of AB Dor C is underestimated by the DUSTY tracks in the HR diagram.

AB - We expand upon the results of Close et al. (2005) regarding the young, low-mass object AB Dor C and its role as a calibration point for theoretical tracks. We present an improved spectral reduction and a new orbital solution with two additional epochs. Our improved analysis confirms our spectral type of M8 (± 1) and mass of 0.090 ± 0.003 M⊙ for AB Dor C. Comparing the results for AB Dor C with other young, low-mass objects with dynamical masses we find a general trend where current evolutionary models tend to over-predict the temperature (or under-predict the mass) for low-mass stars and brown dwarfs. Given our precision, there is a ∼99% chance that the mass of AB Dor C is underestimated by the DUSTY tracks in the HR diagram.

KW - Brown dwarfs

KW - Infrared: stars

KW - Stars: formation

KW - Stars: individual (AB Dor)

KW - Stars: low-mass

KW - Stars: pre-main sequence

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U2 - 10.1002/asna.200510442

DO - 10.1002/asna.200510442

M3 - Article

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SN - 0004-6337

VL - 326

SP - 1033

EP - 1039

JO - Astronomische Nachrichten

JF - Astronomische Nachrichten

IS - 10

ER -

AB Doradus C: Age, spectral type, orbit, and comparison to evolutionary models

Abstract

Keywords

ASJC Scopus subject areas

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