2013MNRAS.434..142B

Query : 2013MNRAS.434..142B

2013MNRAS.434..142B - Mon. Not. R. Astron. Soc., 434, 142-147 (2013/September-1)

The first spectroscopically identified L dwarf in Praesepe.

BOUDREAULT S. and LODIEU N.

Abstract (from CDS):

We have obtained a low-resolution optical spectrum for one of the faintest cluster member candidates in Praesepe with the Optical System for Imaging and low Resolution Integrated Spectroscopy mounted on the 10.4m Gran Telescopio de Canarias. We confirm spectroscopically the first L dwarf member in Praesepe, UGCS J084510.66+214817.1. We derived an optical spectral type of L0.3±0.4 and estimated its effective temperature to Teff = 2279±371K and a mass of 71.1±23.0 MJup, according to state-of-the-art models, placing it at the hydrogen-burning boundary. We measured the equivalent width of the gravity-sensitive sodium doublet at 8182/8194Å, which adds credit to the membership of this new L dwarf to Praesepe. We also derived a probability of ∼ 20.5percent that our candidate would be a field L0 dwarf. We conclude that this object is likely to be a true member of Praesepe, with evidence of being a binary system.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): techniques: spectroscopic - brown dwarfs - stars: fundamental parameters - stars: low-mass - open clusters and associations: individual: Praesepe

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl Blanco 1 OpC 00 03 24.7 -29 57 29           ~ 325 0
2 2MASSW J0030438+313932 BD* 00 30 43.8403218072 +31 39 32.036613732           L2V 18 0
3 SIPS J0058-0651 BD* 00 58 42.5485933944 -06 51 24.034791564         17.671 L0V 33 0
4 2MASSW J0147334+345311 BD* 01 47 33.4442673288 +34 53 11.083329816           L0.5V 12 0
5 2MASS J02512220+2521236 LM* 02 51 22.2202448808 +25 21 23.558424192           M9V 8 0
6 Cl Melotte 20 OpC 03 26 28.1 +48 58 30           ~ 861 0
7 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1450 1
8 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 126 0
9 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3436 0
10 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3076 0
11 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4418 0
12 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1090 0
13 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
14 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 567 0
15 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1566 0
16 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 822 0
17 SDSS J084510.65+214817.1 BD* 08 45 10.65120 +21 48 17.1216           L0.3 6 0
18 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1154 1
19 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 131 0
20 NAME Upper Sco Association As* 16 12 -23.4           ~ 1369 1
21 NAME rho Oph Cluster Cl* 16 26 22 -24 23.7           ~ 70 0
22 Ross 640 WD* 16 28 25.0030896166 +36 46 15.846877416   14.01   13.9   DZ6 204 0
23 2MASS J17331893+4633593 LM* 17 33 18.9384159384 +46 33 59.248987740           M9.5V 15 0

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