SIMBAD references

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

The first spectroscopically identified L dwarf in Praesepe.


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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