2002A&A...391.1025M


Query : 2002A&A...391.1025M

2002A&A...391.1025M - Astronomy and Astrophysics, volume 391, 1025-1032 (2002/9-1)

X-ray emission near the substellar limit: The σ Orionis and Taurus star forming regions.

MOKLER F. and STELZER B.

Abstract (from CDS):

We have carried out an extensive search for X-ray emission from young, very low-mass objects near and beyond the substellar limit, making use of archived ROSAT PSPC and HRI observations pointed at Brown Dwarfs and Brown Dwarf candidates in the young σ Orionis and Taurus-Auriga associations. In σ Ori we identify three Brown Dwarf candidates with X-ray sources; in Taurus-Auriga we add one further X-ray detection of a Brown Dwarf to the list published earlier. We combine this data with all previously X-ray detected Brown Dwarfs and Brown Dwarf candidates in young stellar associations and star forming regions to perform a study of stellar activity parameters on the as yet largest sample of young, very low mass objects. A similar relation between X-ray and bolometric luminosity, and Hα emission, respectively, as is known for T Tauri stars seems to hold for young objects down to the substellar limit, too. No signs for a change in X-ray activity are found on the transition to substellar masses.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: formation, low-mass, brown dwarfs, coronae, activity

CDS comments: LH 0429+17 = EQ 0429+1723. In table 2 CFHT-BD-Tau 4 = [MDM2001] CFHT-BD-Tau 4, StromAnon 13 = [SS94] V410 Anon 13 and Kim 3-89 = [SS94] V410 X-ray 6. In reflist, Lee, 1968 : AJ is a misprint for ApJ (1968ApJ.152.913L).

Simbad objects: 38

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Number of rows : 38
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 285 0
2 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1368 1
3 V* FN Tau TT* 04 14 14.5945463760 +28 27 58.067731188     14.70 13.68   M5e 159 0
4 2MASS J04162725+2053091 TT* 04 16 27.2447467272 +20 53 09.237731208   18.6   16.8 14.9 M5 25 0
5 2MASS J04162791+2053285 TT* 04 16 27.9030355608 +20 53 28.618219644           M5 10 0
6 RX J0416.5+2053 X 04 16 30.2 +20 53 07           ~ 2 1
7 [SS94] V410 X-ray 3 TT* 04 18 07.9729489560 +28 26 03.667161660     18.319     M6 73 0
8 2MASS J04181710+2828419 TT* 04 18 17.1069408984 +28 28 41.928528396     22.175     M6.4 85 0
9 2MASS J04190110+2819420 TT* 04 19 01.1052204768 +28 19 42.090142476           M5.9 68 0
10 2MASS J04190197+2822332 TT* 04 19 01.9772015400 +28 22 33.269537064           M5.5 45 0
11 Cl* Melotte 25 LH 206 TT* 04 20 52.7381420832 +17 46 41.537591076   18.14 16.47     M4.6 39 0
12 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1338 0
13 EM* LkHA 331 TT* 04 31 23.814648 +24 10 52.98312   16.30 14.73 14.98   M4.5V 108 0
14 2MASS J04312405+1800215 TT* 04 31 24.0577715784 +18 00 21.456961776   20.38 18.678   14.32 M7 72 0
15 2MASS J04321606+1812464 TT* 04 32 16.0659498216 +18 12 46.383640812   19.20 17.595     M6.5 85 0
16 2MASS J04324107+1809239 TT* 04 32 41.0777515608 +18 09 23.950420812           M5.7 23 0
17 2MASS J04325119+1730092 Y*O 04 32 51.2019430320 +17 30 09.219060936     22.58     M9 30 0
18 ITG 17 Y*O 04 39 47.4826636728 +26 01 40.690125912     21.556   15.78 M7 95 0
19 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4248 0
20 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 265 0
21 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2268 0
22 M 42 HII 05 35 17 -05 23.4           ~ 4024 0
23 [BZR99] S Ori 43 * 05 38 13.9590316104 -02 35 01.288893300         18.99 ~ 7 0
24 NAME Ori A MoC 05 38 -07.1           ~ 2952 0
25 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 557 0
26 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 791 0
27 [BZR99] S Ori 51 LM* 05 39 03.20592 -02 30 19.9440         20.32 M9Ve 17 0
28 Haro 5-19 Or* 05 39 07.6049425848 -02 32 39.192952344 16.743 15.24 13.99 13.18 12.41 K6.5 27 0
29 2MASS J05390808-0228447 Y*O 05 39 08.0900406592 -02 28 44.831657458 19.34 19.57 18.69 17.56 15.88 M4.0 17 0
30 [BZR99] S Ori 7 Y*O 05 39 08.2185362880 -02 32 28.467592548 20.85 20.61 19.10 17.55 15.70 ~ 17 0
31 [BZR99] S Ori 3 LM* 05 39 20.9751873360 -02 30 33.534650772   20.66 19.25 17.58 15.57 ~ 19 0
32 [BMZ2001] S Ori J053926.8-022614 * 05 39 26.7727217568 -02 26 14.336925828   21.76     18.26 ~ 9 0
33 [SE2004] 108 * 05 39 48.2648127648 -02 29 14.299216584   25.91   20.78 18.68 M7 12 0
34 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1132 1
35 [NC98] Cha HA 1 Y*O 11 07 16.6710048312 -77 35 53.212777692   22.8 21.0   16.38 M7.5/8e 85 0
36 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 787 0
37 NAME rho Oph Complex reg 16 25 -23.5           ~ 78 1
38 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3532 1

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2023.09.23-16:17:09

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