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• W1718792833 startingPage "57" @default.
• W1718792833 abstract "We test state-of-the-art model atmospheres for young very low-mass stars and brown dwarfs in the infrared, by comparing the predicted synthetic photometry over 1.2-24 {mu}m to the observed photometry of M-type spectral templates in star-forming regions. We find that (1) in both early and late young M types, the model atmospheres imply effective temperatures (Teff) several hundred Kelvin lower than predicted by the standard Pre-Main Sequence spectral type-Teff conversion scale (based on theoretical evolutionary models). It is only in the mid-M types that the two temperature estimates agree. (2) The Teff discrepancy in the early M types (corresponding to stellar masses above 0.4 Msol at ages of a few Myr) probably arises from remaining uncertainties in the treatment of atmospheric convection within the atmospheric models, whereas in the late M types it is likely due to an underestimation of dust opacity. (3) The empirical and model-atmosphere J-band bolometric corrections are both roughly flat, and similar to each other, over the M-type Teff range. Thus the model atmospheres yield reasonably accurate bolometric luminosities (Lbol), but lead to underestimations of mass and age relative to evolutionary expectations (especially in the late M types) due to lower Teff. We demonstrate this for a large sample of young Cha I and Taurus sources. (4) The trends in the atmospheric model J-K colors, and their deviations from the data, are similar at Pre-Main Sequence and Main Sequence ages, suggesting that the model dust opacity errors we postulate here for young ages also apply at field ages." @default.
• W1718792833 created "2016-06-24" @default.
• W1718792833 creator A5017575956 @default.
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• W1718792833 date "2015-05-20" @default.
• W1718792833 modified "2023-09-25" @default.
• W1718792833 title "TESTING MODEL ATMOSPHERES FOR YOUNG VERY-LOW-MASS STARS AND BROWN DWARFS IN THE INFRARED: EVIDENCE FOR SIGNIFICANTLY UNDERESTIMATED DUST OPACITIES" @default.
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• W1718792833 doi "https://doi.org/10.1088/0004-637x/805/1/57" @default.
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