AB Doradus C: Age, Spectral Type, Orbit, and Comparison to Evolutionary Models

Details AB Doradus C: Age, Spectral Type, Orbit, and Comparison to Evolutionary Models AB Doradus C: Age, Spectral Type, Orbit, and Comparison to Evolutionary Models

2005-09-14

arxiv.org/abs/astro-ph/0509400v1

Astronomy and Astrophysics

Astrophysics

7 pages, 10 figures, proceedings for the workshop "Ultralow-mass star formation and evolution", to be published in Astronomisc

Scientific paper

10.1002/asna.200510442

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 solar masses 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.

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