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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20100415T000000
DTEND;TZID=Atlantic/Canary:20100415T010000
UID:iactalks-178
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/178
CREATED:2010-04-15T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The Mg/Fe characterisation of MILES library for stellar population
DESCRIPTION:The Mg/Fe characterisation of MILES library for stellar populat
 ion\nDr. André Milone\n\nThe current databases of empirical star spectra 
 for modelling single-aged stellar populations (SSPs) generally do not chem
 ically characterize their stars completely. Spectral properties of stars a
 nd their populations may change considerably if the elemental abundance ra
 tios E/Fe differ from the solar-scaled values. We intend to build up robus
 t integrated spectral energy distribution of SSPs older than 1 Gyr by adop
 ting the MILES database (Medium-resolution Isaac Newton Telescope Library 
 of Empirical Spectra) and taking into account the Mg/Fe ratio of its stars
 . Magnesium is a proxy of the alpha-capture elements and the alpha/Fe rati
 o has been widely used as an indicator of the star formation time scale. I
 n this talk, I present how accurate and extensive our compilation and dete
 rmination of [Mg/Fe] were obtained around MILES to compute state-of-the-ar
 t SSP models. Published high resolution measurements were adopted to defin
 e a uniform scale of [Mg/Fe] and calibrate our results at medium resolutio
 n that were based on the spectral synthesis of two strong Mg features.\n\n
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