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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20141031T123000
DTEND;TZID=Atlantic/Canary:20141031T133000
UID:iactalks-666
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/666
CREATED:2014-10-31T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Binary stars in stellar population synthesis models and the UV uptu
 rn in early type galaxies.
DESCRIPTION:Binary stars in stellar population synthesis models and the UV 
 upturn in early type galaxies.\nDr. Fabiola Hernández-Pérez\n\nMany star
 s are observed to belong to multiple systems. Interactions between binary 
 stars may change the evolutionary track of a star, creating atypical stars
  like Blue Stragglers and explaining the existence of extreme horizontal b
 ranch (EHB) stars. Using evolutionary population synthesis models includin
 g binary star evolutionary tracks from Hurley et al. and including the two
  He white dwarfs merger channel, suggested by Han et al., for the formatio
 n of EHB stars we compute a series of isochrones which include these atypi
 cal stars. We derive the integrated spectral energy distributions and the 
 colors corresponding to these populations. The predictions of this model a
 re in good agreement with traditional population synthesis models, except 
 when the spectrum of the stellar population is dominated by binary stars o
 r their products, e.g., EHB stars in the ultraviolet (UV) of early-type ga
 laxies (ETGs) (Hernández-Pérez and Bruzual 2013). Using this
  binary population synthesis model we reproduce successfully the observed 
 colour-colour diagram of a sample of 3417 ETGs observed both in the optica
 l (SDSS -DR8) and the UV (GALEX-GR6) (Hernández-Pérez and Br
 uzual 2014). I will show how important is to consider binary interactions 
 in evolutionary synthesis models.
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