2003AJ....125..343L

Query : 2003AJ....125..343L

2003AJ....125..343L - Astron. J., 125, 343-347 (2003/January-0)

A flaring L5 dwarf: the nature of Hα emission in very low (sub)stellar objects.

LIEBERT J., KIRKPATRICK J.D., CRUZ K.L., REID I.N., BURGASSER A., TINNEY C.G. and GIZIS J.E.

Abstract (from CDS):

Time series spectrophotometry of the L5 dwarf 2MASS J01443536-0716142 showed strong Hα emission that declined by nearly 75% in four consecutive exposures. The line was not detected in emission on a spectrum obtained 11 months later. This behavior contrasts with that of 2MASSI J1315309-264951, an L5 dwarf that has shown even stronger Hα emission on four separate occasions. The observational database suggests that L dwarfs can be found in such strong flares only occasionally, with a duty cycle on the order of 1%. In contrast, the few, continuously strong Hα emitters, including PC 0025+0447 and 2MASSI J1237392+652615, must either be (1) objects no older than 10-100 Myr with continuously active accretion and/or chromospheres, but which apparently formed in isolation from known young stellar clusters and associations, or (2) objects empowered by a different but unknown mechanism for the Hα energy.

Abstract Copyright: ∼

Journal keyword(s): Stars: Chromospheres - stars: individual (2MASS J01443536-0716142) - stars: individual (2MASSI J1315309-264951) - stars: individual (PC 0025+0447) - Stars: Individual: Alphanumeric: 2MASSI J1237392+652615 - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 220 1
2 PC 0025+0447 BD* 00 27 41.9817343344 +05 03 41.691766608           L1.0 75 0
3 2MASS J01443536-0716142 BD* 01 44 35.4064614144 -07 16 14.318758700           L6.5 63 0
4 2MASSW J0149090+295613 BD* 01 49 09.0028348631 +29 56 12.511555579           M9.5V 62 0
5 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
6 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
7 ITG 17 LM* 04 39 47.4826636728 +26 01 40.690125912     21.556   15.78 M7 109 0
8 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
9 [BZR99] S Ori 55 LM* 05 37 25.88208 -02 34 32.0736         21.07 M9Ve 23 0
10 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
11 UGCS J053900.29-023705.7 Y*? 05 39 00.29712 -02 37 05.7648           M8 25 0
12 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
13 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
14 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
15 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 376 0
16 2MASS J12373919+6526148 BD* 12 37 39.19632 +65 26 14.8092           T6.5 85 0
17 2MASS J13153094-2649513 BD* 13 15 30.8597827568 -26 49 51.829331165           L5e 52 1
18 LP 271-25 LM* 14 28 43.2275214164 +33 10 39.259309081   21.2   17.8   M9Ve 262 0
19 [RR90] Oph 2349.8-2601 Or* 16 26 51.2924609616 -24 32 42.001375272           M8.5 57 0
20 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1

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