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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20200721T123000
DTEND;TZID=Atlantic/Canary:20200721T133000
UID:iactalks-1414
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1414
CREATED:2020-07-21T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The impact of Galactic evolution on binary interactions, as shown i
 n hot subdwarf binaries
DESCRIPTION:The impact of Galactic evolution on binary interactions, as sho
 wn in hot subdwarf binaries\nDr. Joris Vos\n\nWide hot subdwarf B (sdB) bi
 naries with main-sequence companions are  outcomes of stable mass transfer
  from evolved red giants. The orbits of  these binaries show a strong corr
 elation between their orbital periods  and mass ratios. The origins of thi
 s correlation have, so far, been  lacking a conclusive explanation. We hav
 e performed a small but  statistically significant binary population synth
 esis study with the  binary stellar evolution code MESA. We have used a st
 andard model for  binary mass loss and a standard Galactic metallicity his
 tory.  We have  achieved an excellent match to the observed period - 
 mass ratio  correlation without explicitly fine-tuning any parameters. Fur
 thermore,  our models produce a good match to the observed period - metall
 icity  correlation. We demonstrate, for the first time, how the metallicit
 y  history of the Milky Way is imprinted in the properties of the observed
   post-mass transfer binaries. We show that Galactic chemical evolution  i
 s an important factor in binary population studies of interacting  systems
  containing at least one evolved low-mass (Mi < 1.6 Msol)  component. F
 inally, we provide an observationally supported model of  mass transfer fr
 om low-mass red giants onto main-sequence stars.\nZoom link: https://redir
 is.zoom.us/j/98017007654
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