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BEGIN:VEVENT
DTSTAMP:20260628T130749Z
DTSTART;VALUE=DATE-TIME:20130307T090000
DTEND;VALUE=DATE-TIME:20130307T093000
SUMMARY:Roberto Raddi: Emission line stars in and beyond the Perseus Arm
TZID:Europe/London
UID:20130307-094d43a23c716fc2013d364731907f61@warwick.ac.uk
CREATED:20130304T164108Z
DESCRIPTION:The Isaac Newton Telescope (INT) Photometric H-halpha Survey 
 of the Northern Galactic plane (IPHAS\, Drew et al. 2005) is a powerful 
 tool for selecting effectively emission line stars. More than 50% of the
  IPHAS emitters are suggested to be classical Be stars (Corradi et al.\,
  2008). We proposed this class of stars\, which are intrinsically bright
  and relatively young (< 100 Myr old)\, as novel structure tracers of th
 e Milky Way disc. The focus of the talk is on a sub-sample of 67 classic
 al Be stars that are drawn out of our larger sample of 248 newly uncover
 ed classical Be stars\, in a section of the Galactic disc towards the Pe
 rseus Arm. I will present the optical spectroscopic follow-up and the sp
 ectral classification of the sample. I will discuss the determination of
  interstellar reddenings and the problems concerning it\, along with the
  assessment of spectroscopic parallaxes. The discussion will focus on th
 e study of the spatial distribution of the sample. The stars are confirm
 ed to be distant classical Be stars\, found at heliocentric distances ra
 nging between ~2 kpc and ~12 kpc. However\, the errors on the distances 
 are too large to allow statistical distinction between models placing th
 e stars in the spiral arms or in a smooth exponential declining distribu
 tion. The total sample of 248 objects doubles the number of known classi
 cal Be stars in this part of the Galactic plane and it is offered for mo
 re exploitation in future\, when Gaia parallaxes will be available.
LOCATION:P5.23
CATEGORIES:Astronomy Seminar
LAST-MODIFIED:20130304T164108Z
ORGANIZER;CN=Mona Shorehdeli:
END:VEVENT
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