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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20220719T170000
DTEND;TZID=Atlantic/Canary:20220719T180000
UID:iactalks-1602
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1602
CREATED:2022-07-19T17:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:IAU G5 talk: A massive catalogue of ultracool dwarfs identified wit
 h LAMOST DR7
DESCRIPTION:IAU G5 talk: A massive catalogue of ultracool dwarfs identified
  with LAMOST DR7\nDr. Youfen Wang\n\nWe present a sample of 734 ultracool 
 dwarfs using LAMOST DR7 spectra,  i.e.,  those having a spectral type
  of or later than M6, including an  L0.  All of these red or brown dw
 arfs are within 360 pc, with a Gaia G  magnitude brighter than 19.2 mag, a
  BP-RP color redder than 2.5 mag   and an absolute G magnitude fainte
 r than 9 mag. Their stellar  parameters  (Teff, log g, and [M/H]) are
  consistent with being the  Galactic thin-disk  population, which is 
 further supported by their  kinematics using LAMOST radial velocity plus G
 aia proper motion and  parallax.  A total of 77 are detected  wi
 th the lithium absorption  line at 6708 A, signifying youth and substellar
  nature. We report on  their kinematic ages estimated by the velocity disp
 ersion. Thirty five  close pairs are identified, of which the binarity of 
 six is discovered  for the first time.
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