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

Research School of Astronomy & Astrophysics

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

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_\sun 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
Pages (from-to)	1033-1039
Number of pages	7
Journal	Astronomische Nachrichten
Volume	326
DOIs	https://doi.org/10.1002/asna.200510442
Publication status	Published - 1 Dec 2005

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10.1002/asna.200510442

https://ui.adsabs.harvard.edu/abs/2005AN....326.1033N

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@article{aa34f5f6edda4e788170246af8fd2405,

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\sun 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 = "infrared: stars, stars: formation, stars: low-mass, brown dwarfs, stars: pre-main sequence, stars: individual (AB Dor), Astrophysics",

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",

month = dec,

day = "1",

doi = "10.1002/asna.200510442",

language = "English",

volume = "326",

pages = "1033--1039",

journal = "Astronomische Nachrichten",

issn = "0004-6337",

publisher = "Wiley-VCH Verlag GmbH",

}

TY - JOUR

T1 - AB Doradus C: 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 - 2005/12/1

Y1 - 2005/12/1

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\sun 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\sun 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 - infrared: stars

KW - stars: formation

KW - stars: low-mass

KW - brown dwarfs

KW - stars: pre-main sequence

KW - stars: individual (AB Dor)

KW - Astrophysics

U2 - 10.1002/asna.200510442

DO - 10.1002/asna.200510442

M3 - Article

SN - 0004-6337

VL - 326

SP - 1033

EP - 1039

JO - Astronomische Nachrichten

JF - Astronomische Nachrichten

ER -

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

Abstract

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