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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20180503T103000
DTEND;TZID=Atlantic/Canary:20180503T113000
UID:iactalks-1151
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1151
CREATED:2018-05-03T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Finding the double sunsets: close binary stars, large spectroscopic
  surveys
DESCRIPTION:Finding the double sunsets: close binary stars, large spectrosc
 opic surveys\nDr. Carles Badenes\n\nI will discuss our present knowledge o
 f the statistics of stellar multiplicity (the multiplicity fraction and th
 e distribution of periods, mass ratios, and eccentricities), and the impli
 cations for stellar evolution, in particular for Type Ia Supernovae (SN Ia
 ). I will describe how multi-epoch radial velocity measurements from large
  spectroscopic surveys can open a new observational window on stellar mult
 iplicity, and present two case studies: white dwarfs in SDSS/SEGUE and the
  ESO SPY survey, and main sequence stars and red giants in SDSS/APOGEE. Fo
 r the white dwarfs, we can measure their merger rate and evaluate their vi
 ability as Type Ia SN progenitors. For the main sequence stars and red gia
 nts, we can explore the interplay between stellar evolution and stellar mu
 ltiplicity, evaluate the rate of stellar mergers, and uncover a strong dep
 endence of the multiplicity fraction with metallicity.
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