2004A&A...424..619B


Query : 2004A&A...424..619B

2004A&A...424..619B - Astronomy and Astrophysics, volume 424, 619-625 (2004/9-3)

X-ray detections of two young bona-fide brown dwarfs.

BOUY H.

Abstract (from CDS):

I report the detection of two bona-fide brown dwarfs by XMM-Newton: [GY92] 141 in the ρ-Ophiuchus star-forming region and DENIS J155601-233809 in the Upper Scorpius OB association. The two objects have been detected with luminosities of LX=8.35±2.86x1028erg/s and LX=6.54±1.35x1028erg/s respectively, corresponding to luminosity ratios of log(LX/Lbol)=-2.07 and log(LX/Lbol)=-2.69. The two sources were close to the limit of detection of the instruments at only 2∼3-σ above the background level, and no significant flare or variation could be detected during the 48.3 ks and 33.9 ks observations. [GY92] 141 had already been observed 10 months earlier with Chandra by Imanishi et al. (2001ApJ...563..361I) with a luminosity ∼14 times fainter than the one reported here, indicating that the X-ray emission of this object is strongly variable.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - stars: coronae - X-rays: individuals: [GY92] 141, DENIS J155601-233809

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 274 0
2 LP 666-9 LM* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 237 0
3 UScoCTIO 113 LM* 15 56 01.0406921856 -23 38 08.143283832           M6.5 25 0
4 NAME Upper Sco Association As* 16 12 -23.4           ~ 1190 1
5 [RR90] Oph 2349.8-2601 Y*O 16 26 51.2924609616 -24 32 42.001375272           M8.5 51 0
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3334 1
7 VB 10 Er* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 459 1

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2022.05.22-00:01:55

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