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DTSTAMP:20260414T193920
DTSTART:20150219T110000
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URL:https://murmitoyen.com/events/vanille/udem/detail/579843-unprecedented-
 accuracy-in-the-fundamental-parameters-of-stars-from-multiple-stellar-syst
 ems
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Unprecedented accuracy in the fundamental parameters of stars from 
 multiple stellar systems
DESCRIPTION:Conférence de Andrej Prsa\, Villanov UniversityRésuméEclipsi
 ng binary stars have long served as calibrators of the fundamental stellar
  properties across the H-R diagram. Because of the favorable geometric ali
 gnment and well understood dynamical laws that govern the motions of the c
 omponents\, the modeling of their light and radial velocity curves can pro
 vide us with masses\, radii\, temperatures and luminosities to a precision
  better than 1-2%. NASA's Kepler mission observed a 100-deg^2 patch of the
  sky in the Cygnus-Lyra region essentially uninterruptedly for 4 years\, a
 nd it attained an unprecedented photometric precision of ~20ppm. The missi
 on harvested over 2600 eclipsing binaries\; of those\, ~20% were found to 
 be triples by means of eclipse timing variations. Most interestingly\, the
 re are more that 30 objects that show tertiary transits\, either by anothe
 r stellar companion or by a circumbinary planet. In those cases the fundam
 ental stellar parameters can be attained a full order of magnitude more pr
 ecisely than from eclipsing binaries alone\, typically to 0.1% and\, in tw
 o cases\, even better. I will present the methodology and the first result
 s of these studies\, and stress the implications for the low-mass end of t
 he H-R diagram. Présentée par le Groupe Astronomie et astrophysique du
  Département de physique de l'Université de Montréal. Cette confére
 nce est destinée à des spécialistes dans le domaine de l'astrophysique 
 et sera donnée en anglais.
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