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HD 142523


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Gravity Indicators in the Near-Infrared Spectra of Brown Dwarfs
We investigate the sensitivity to temperature and gravity of the strongabsorption features in the J- and K-band spectra of substellar objects.We compare the spectra of giants and young M dwarfs (of low gravity) tofield M and L dwarfs (of high gravity) and to model spectra from theLyon group. We find that low-resolution spectra of M4-M9 stars and youngbrown dwarfs at R~350 and signal-to-noise ratios greater than 70 candetermine the spectral type to a precision of +/-1 subtype using theH2O and CO bands and can measure the surface gravity to+/-0.5 dex using the atomic lines of K I and Na I. This result pointstoward the development of photometric spectral indices to separatelow-mass members from foreground and background objects in youngclusters and associations. We also emphasize the complexity of theinterpretation of the empirical quantities (e.g., spectral types) interms of the physical variables (e.g., temperature, opacities) in thecool atmospheres of young brown dwarfs.Based on observations obtained with the Multiple Mirror TelescopeObservatory, a joint facility of the University of Arizona and theSmithsonian Institution.

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观测天体数据

星座:天蠍座
右阿森松:15h55m59.89s
赤纬:-26°46'09.0"
视星:9.178
右阿森松适当运动:-11.2
赤纬适当运动:11.8
B-T magnitude:10.125
V-T magnitude:9.257

目录:
适当名称   (Edit)
HD 1989HD 142523
TYCHO-2 2000TYC 6787-809-1
USNO-A2.0USNO-A2 0600-19084616
HIPHIP 78031

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