M dwarfs: effective temperatures, radii and metallicities
TLDR
In this article, the effective temperatures and bolometric luminosities for a large sample of nearby M dwarfs were determined for which high accuracy optical and infrared photometry is available, using the flux ratio in different bands as a proxy of both effective temperature and metallicity.Abstract:
We empirically determine effective temperatures and bolometric luminosities for a large sample of nearby M dwarfs, for which high accuracy optical and infrared photometry is available. We introduce a new technique which exploits the flux ratio in different bands as a proxy of both effective temperature and metallicity. Our temperature scale for late-type dwarfs extends well below 3000 K (almost to the brown dwarf limit) and is supported by interferometric angular diameter measurements above 3000 K. Our metallicities are in excellent agreement (usually within 0.2 dex) with recent determinations via independent techniques. A subsample of cool M dwarfs with metallicity estimates based on hotter Hipparcos common proper motion companions indicates our metallicities are also reliable below 3000 K, a temperature range unexplored until now. The high quality of our data allows us to identify a striking feature in the bolometric luminosity versus temperature plane, around the transition from K to M dwarfs. We have compared our sample of stars with theoretical models and conclude that this transition is due to an increase in the radii of the M dwarfs, a feature which is not reproduced by theoretical models.read more
Citations
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Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
Mark J. Pecaut,Eric E. Mamajek +1 more
TL;DR: In this article, the intrinsic colors and temperatures of 5-30 Myr old pre-main sequence (pre-MS) stars were analyzed using optical spectra taken with the SMARTS 1.5m telescope.
Journal ArticleDOI
Mesa isochrones and stellar tracks (mist). i. solar-scaled models
TL;DR: The Modules for Experiments in Stellar Astrophysics (MESA) Isochrones and Stellar Tracks (MIST) project as discussed by the authors provides a set of stellar evolutionary tracks and isochrones computed using MESA, a state-of-the-art 1D stellar evolution package.
Journal ArticleDOI
Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
Mark J. Pecaut,Eric E. Mamajek +1 more
TL;DR: In this article, the intrinsic colors and temperatures of 5-30 Myr old pre-main sequence (pre-MS) stars using the F0 through M9 type members of nearby, negligibly reddened groups: Eta Cha cluster, TW Hydra Association, Beta Pic Moving Group, and Tucana-Horologium Association.
Journal ArticleDOI
MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
TL;DR: The Modules for Experiments in Stellar Astrophysics (MESA) Isochrones and Stellar Tracks (MIST) project as mentioned in this paper provides a set of stellar evolutionary tracks and isochrones computed using MESA, a state-of-the-art 1D stellar evolution package.
Journal ArticleDOI
Models of very-low-mass stars, brown dwarfs and exoplanets
TL;DR: Recent advances in modelling the stellar to substellar transition are reviewed, and the revised solar oxygen abundances and cloud model allow the photometric and spectroscopic properties of this transition to be reproduced for the first time.
References
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