2002A&A...393L..85B

Query : 2002A&A...393L..85B

2002A&A...393L..85B - Astronomy and Astrophysics, volume 393L85-88 (2002/10-3)

Discovery of a very cool object with extraordinarily strong Hα emission.

BARRADO Y NAVASCUES D., ZAPATERO OSORIO M.R., MARTIN E.L., BEJAR V.J.S., REBOLO R. and MUNDT R.

Abstract (from CDS):

We report on the finding of the strongest Hα emission - pseudoequivalent width of 705Å - known so far in a young, late type dwarf. This object, named as S Ori 71, is a substellar candidate member of the 1-8Myr star cluster σOrionis. Due to its overluminous location in color-magnitude diagrams, S Ori 71 might be younger than other cluster members, or a binary of similar components. Its mass is in the range 0.021-0.012M☉, depending on evolutionary models and possible binarity. The broad Hα line of S Ori 71 appears asymmetric, indicative of high velocity mass motions in the Hα forming region. The origin of this emission is unclear at the present time. We discuss three possible scenarios: accretion from a disk, mass exchange between the components of a binary system, and emission from a chromosphere.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: σ Orionis - stars: low-mass, brown dwarfs - stars: individual: S Ori 71 - stars: pre-main sequence

Nomenclature: [BZR99] S Ori NN (No. 71) added. [BMZ2001] S Ori JHHMMSS.s+DDMMSS N=1 added.

CDS comments: PC 0025+0047 is a misprint for PC 0025+0447.

Simbad objects: 19

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Number of rows : 19
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 PC 0025+0447 BD* 00 27 41.9817343344 +05 03 41.691766608           L1.0 75 0
2 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
3 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
4 NAME Taurus Cluster OpC 04 24 03.905 +26 53 24.40           ~ 79 0
5 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 466 2
6 V* V573 Ori Or* 05 35 42.7660961328 -06 34 51.772025532   15.69 15.797   13.71067 M0.5 58 0
7 [BZR99] S Ori 55 LM* 05 37 25.88208 -02 34 32.0736         21.07 M9Ve 23 0
8 [BZR99] S Ori 47 BD* 05 38 14.62416 -02 40 15.4020         20.53 L1e 29 0
9 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
10 UGCS J053900.29-023705.7 Y*? 05 39 00.29712 -02 37 05.7648           M8 25 0
11 V* PT Mon TT* 06 40 32.0073793968 +09 49 35.470663932 17.7 18.26 17.26 16.11 15.05 M5 49 0
12 LP 666-9 BD* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 274 1
13 V* WZ Cha Or* 11 10 53.3212598040 -76 34 32.057703048   16.41 15.48   13.07 M4Ve 84 0
14 V* HW Lup Or* 15 45 17.4118414392 -34 18 28.286447220   17.41 16.25     M1 87 0
15 V* HO Lup Or* 16 07 00.603672 -39 02 19.49316   13.94 13.17 13.03   M1e 70 0
16 WRAY 16-203 Or* 16 08 29.7275063376 -39 03 11.024360496   16.26 15.91 15.38 15.69 K0: 180 1
17 THA 15-42 Or* 16 10 51.5849835192 -38 53 13.767885384   15.89 14.48 14.44 12.95 M1e 84 0
18 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
19 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1

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