2001A&A...377L...9B

Query : 2001A&A...377L...9B

2001A&A...377L...9B - Astronomy and Astrophysics, volume 377L9-13 (2001/10-2)

Optical spectroscopy of isolated planetary mass objects in the σ Orionis cluster.

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

Abstract (from CDS):

We have obtained low resolution optical spectra of 15 isolated planetary mass objects (IPMOs) in the σ Orionis cluster, and derived spectral types by comparison with nearby M and L dwarfs. The spectral types are in the range late M - mid L, in agreement with our expectations based on colors and magnitudes for bona fide members. Therefore, most of these objects have masses below the deuterium burning limit. About 2/3 show Hα in emission at our spectral resolution. From our spectroscopic and photometric data, we infer that three IPMOs in this sample may be binaries with components of similar masses. These results confirm that the substellar mass function of the σ Orionis cluster, in the form dN/dM, keeps rising in the planetary domain.

Abstract Copyright: ∼

Journal keyword(s): giant planet formation - open clusters and associations: individual: σ Orionis - stars: brown dwarfs

Simbad objects: 18

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Number of rows : 18
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 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
2 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
3 [BZR99] S Ori 66 BD* 05 37 24.71064 -02 31 52.3308         23.23 L3.5:e 13 0
4 [BZR99] S Ori 55 LM* 05 37 25.88208 -02 34 32.0736         21.07 M9Ve 23 0
5 [BZR99] S Ori 67 BD* 05 38 12.61464 -02 21 36.7956         23.40 L5:e 9 0
6 [BZR99] S Ori 47 BD* 05 38 14.62416 -02 40 15.4020         20.53 L1e 29 0
7 [BZR99] S Ori 53 LM* 05 38 25.11744 -02 48 02.7720         20.99 M9V 13 0
8 [BZR99] S Ori 65 BD* 05 38 26.1 -02 23 05         23.23 L3.5: 12 0
9 [BZR99] S Ori 54 LM* 05 38 33.33648 -02 20 59.4060           M9.5Ve 11 0
10 [BZR99] S Ori 68 BD* 05 38 39.1 -02 28 05         23.77 L5: 25 1
11 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
12 * 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) 855 0
13 [BZR99] S Ori 61 BD* 05 38 52.69032 -02 28 43.9032         22.78 L0: 5 0
14 [BZR99] S Ori 56 BD* 05 39 00.78768 -02 21 41.8032         21.80 L0.5 13 0
15 [BZR99] S Ori 58 BD* 05 39 03.59736 -02 25 36.6060         21.50 L0e 14 0
16 [BZR99] S Ori 50 LM* 05 39 10.80408 -02 37 14.5884         20.52 M9V 12 0
17 [BZR99] S Ori 60 BD* 05 39 37.51848 -02 30 41.9220         22.75 L2 20 0
18 [BZR99] S Ori 62 BD* 05 39 42.05208 -02 30 31.6080         23.03 L2:e 13 0

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