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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130531T123000
DTEND;TZID=Atlantic/Canary:20130531T133000
UID:iactalks-498
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/498
CREATED:2013-05-31T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:GTC/OSIRIS spectroscopic confirmation of the first L dwarf in Praes
 epe
DESCRIPTION:GTC/OSIRIS spectroscopic confirmation of the first L dwarf in P
 raesepe\nDr. Steve Boudreault\n\nFundamental properties of brown dwarfs, s
 uch as luminosity and effective temperature, evolve with age. Large sample
 s of spectroscopically-confirmed substellar objects with well-determined a
 ges and distances are needed to constrain those parameters.  We are embark
 ed in a spectroscopic follow-up with GTC/OSIRIS of low-mass member candida
 tes selected in several open clusters to constrain their membership. Here 
 I will present the first L dwarf member in Praesepe confirmed by photometr
 y, astrometry, and spectroscopy. We derived an optical spectral type of L0
 .3+/-0.4 and a mass placing it at the hydrogen-burning boundary. Consideri
 ng the measured equivalent width of the gravity-sensitive sodium doublet, 
 and the derived membership probability of ~80% or higher, we conclude that
  this object is likely to be a true member of Praesepe, with evidence of b
 eing a binary system.
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