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 output: Contribution to journalArticlepeer-review

26 Scopus citations


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 languageEnglish (US)
Pages (from-to)1033-1039
Number of pages7
JournalAstronomische Nachrichten
Issue number10
StatePublished - 2005


  • 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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