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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20160616T103000
DTEND;TZID=Atlantic/Canary:20160616T113000
UID:iactalks-925
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/925
CREATED:2016-06-16T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Cosmic variance in [O/Fe] in the Galactic disk
DESCRIPTION:Cosmic variance in [O/Fe] in the Galactic disk\nSara Bertrán d
 e Lis\n\n\nThe  detection of chemical inhomogeities in the Galactic disk r
 equires an  oustanding precision in the abundance measurements and a thoro
 ugh  estimation of the uncertainties. So far, studies in alpha-elements in
   disk stars either do not reach the required precision, or comprise too  
 small samples in the solar neighborhood. Thanks to the Apache Point  Galac
 tic Evolution Experiment (APOGEE), we have for the first time a  large spe
 ctroscopic sample of about 100.000 disk stars, with data  homogeneously ob
 tained, reduced, and analyzed. Taking advantage of such  database, we exam
 ine the distribution of oxygen-to-iron abundance ratio  in stars across th
 e Galactic disk. These data reveal that the square  root of the star-to-st
 ar cosmic variance in the [O/Fe] at a given  metallicity is about 0.03 to 
 0.04 dex in both the thin- and thick-disk  populations. Measuring the spre
 ad in [O/Fe] and other abundance ratios  can provide strong constraints fo
 r models of Galactic chemical  evolution. In this talk we will describe ho
 w we arrived at this result,  the calculation of uncertainties, and implic
 ations regarding the  chemical evolution of the Galaxy.\n
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