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HD 178269


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A young binary brown dwarf in the R-CrA star formation region
We present imaging and spectroscopic observations with HST (WFPC2,ACS/HRC and STIS), VLT (FORS2) and Keck (HIRES) of the dM 8 ultra-cooldwarf DENIS-P J185950.9-370632, located in the R-CrAregion. The presence of lithium absorption at 670.8 nm and the strongHα emission indicate a young age and a sub-stellar mass. Ourdiffraction-limited images resolve a companion at the separation limitof HST/ACS (˜0.06 arcsec). The 2.1 mJy flux in the LW2 filter(5.0-8.5 μm) of the Infrared Space Observatory\citep{1999A&A...350..883} likely corresponds to an infrared excess,suggesting the presence of circumstellar material. Proper motion andphotometric measurements, as well as the Hα activity, confirmmembership in the R-CrA star forming region. If confirmed by furtherobservations, DENIS-P J185950.9-370632 would be the first accretingsub-stellar multiple system observed to date.

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观测天体数据

星座:人馬座
右阿森松:19h08m29.05s
赤纬:-15°52'43.0"
视星:8.42
距离:671.141 天文距离
右阿森松适当运动:11.7
赤纬适当运动:2.6
B-T magnitude:8.527
V-T magnitude:8.429

目录:
适当名称   (Edit)
HD 1989HD 178269
TYCHO-2 2000TYC 6283-335-1
USNO-A2.0USNO-A2 0675-31743095
HIPHIP 94016

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