New Evolutionary Tracks for Very Low Mass Stars

Details New Evolutionary Tracks for Very Low Mass Stars New Evolutionary Tracks for Very Low Mass Stars

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446l..35b&link_type=abstract

Astrophysical Journal Letters v.446, p.L35

Astronomy and Astrophysics

Astronomy

118

Stars: Low-Mass, Brown Dwarfs, Stars: Evolution, Stars: Late-Type

Scientific paper

We present new evolutionary calculations for low-mass and very low mass M dwarfs, for a metallicity range -2 ≤ [M/H] ≤ 0, down to the hydrogen-burning minimum mass (0.07 < M/Msun < 0.6). We use the most recent atmosphere models calculated by Allard & Hauschildt (1995), based on synthetic spectra at finite metallicity, and gray atmosphere models based on Alexander & Ferguson (1994) Rosseland opacities.
Comparisons are made with observational results down to the bottom of the main sequence, for different metallicities, in magnitude-color and color-color diagrams. We find excellent agreement between theory and observations over the whole characteristic temperature/luminosity range. This enables us to determine the mass of the faintest objects observed, which is found to be mlim ≍ 0.085 Msun for [M/H] = 0 and -0.5, and mlim = 0.09 Msun for [M/H] = -1.5, for an age of 10 Gyr.
We also examine the effect of the age, the metallicity, and the outer boundary conditions on the evolution.

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