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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20160614T123000
DTEND;TZID=Atlantic/Canary:20160614T133000
UID:iactalks-871
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/871
CREATED:2016-06-14T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Photometric study of Pre-Main Sequence Stars in massive star-burst 
 clusters
DESCRIPTION:Photometric study of Pre-Main Sequence Stars in massive star-bu
 rst clusters\nDr. Giacomo Beccari\n\nCurrent planet formation theories are
  bound to comply with the  observational constraint that protoplanetary di
 sks have lifetime of ~3  Myr. This timescale is mostly based on spectrosco
 pic studies of objects  accreting matter from a circumstellar disk around 
 pre-main sequence  stars (PMS) located in low-density, nearby (d<1-2kpc
 ) star forming  regions. These objects do not reflect the conditions in pl
 ace in the  massive starburst clusters where most of star formation occurs
  in the  universe. Using a new robust method to indentify PMS objects thro
 ugh  their photometric excess in the Halpha band, we have studied with the
   HST and ground based facilities the PMS population several starburst  cl
 usters, namely NGC3603 in the Milky Way and several clusters in the  Carin
 a Nebula,  30 Doradus and the surrounding regions in the Large  Magel
 lanic Cloud and NGC 346 and NGC 602 in the Small Magellanic Cloud.  We fou
 nd a wide spread of ages (0.5 to 20 Myr) for PMS stars, clearly  showing t
 hat accretion from circumstellar disks is still going on well  past 10 Myr
 . This finding challenges our present understanding of  protoplanetary dis
 k evolution, and can imply a new scenario for the  planet formation mechan
 ism and of star clusters formation in general.  Based on these results we 
 were recently granted 175hr with OmegaCAM at  the VST to carry out a deep 
 optical wide field survey of nearby (<3kpc) star forming regions. These
  observations will  provide physical parameters (including mass accretion 
 rates) for over 10000 PMS  stars and will establish whether the long times
 cales of circumstellar discs  are common.
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