BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ZContent.net//ZapCalLib 1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20140429T123000
DTEND;TZID=Atlantic/Canary:20140429T133000
UID:iactalks-637
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/637
CREATED:2014-04-29T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Rotational velocities in Galactic OB stars: the Fourier transform r
 evolution 
DESCRIPTION:Rotational velocities in Galactic OB stars: the Fourier transfo
 rm revolution \nDr. Sergio Simon\n\nThe application of the Fourier transfo
 rm (FT) technique to high  resolution spectra of OB-type stars has challen
 ged our previous  knowledge about stellar rotation in stars in the upper r
 egion of the  HRD. The FT is an old and powerful tool that has being widel
 y used in  the case of cool stars, but only very recently applied to massi
 ve stars  in a systematic way. In this talk I will present the results of 
 the  line-broadening characterization of ~250 Galactic OB-type stars  (inc
 luding dwarfs, giants and supergiants with spectral types O4-B9)  from the
  IACOB spectroscopic database. I will show how these analyses  have led to
  a downward revision of previously determined projected  rotational veloci
 ties in these stars, and have definitely confirmed the  presence of a non-
 negligible extra line-broadening contribution  (commonly called macroturbu
 lent broadening) in the whole OB star domain.  I will also provide some no
 tes about the importance of these findings  on the evolution of massive st
 ars and the detection of stellar  oscillations along the lifetime of these
  important astrophysical  objects.
END:VEVENT
END:VCALENDAR