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DTSTART;TZID=Europe/Rome:20230328T113000
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DTSTAMP:20260421T150447
CREATED:20230210T064046Z
LAST-MODIFIED:20230325T095723Z
UID:11279-1680003000-1680006600@www.oa-roma.inaf.it
SUMMARY:colloquium - Giulia De Somma: The classical Cepheids modelling in the Gaia Era
DESCRIPTION:Classical Cepheids are the most used primary distance indicators to calibrate\nthe cosmic distance ladder and reliable stellar population tracers. These stars\nhave been adopted to probe galactic evolution and star formation\, thanks to\ntheir intrinsic variability and the link between pulsation properties and\nevolutionary parameters. A theoretical approach to the study of these objects\nis crucial to interpret observed behaviors and fully exploiting the accuracy of\nobserved oscillation characteristics in terms of stellar properties and distances.\nBy using the Stellingwerf hydrodynamical code\, we recently provided detailed\nhomogeneous nonlinear Classical Cepheid pulsation models. We take into\naccount variations of chemical composition\, mass-luminosity (ML) relation\, and\nefficiency of super-adiabatic convection.\nThe predicted pulsation observables included the instability strips\, multi-filter\nlight curves\, and the corresponding mean magnitudes and colors.\nWe used these quantities to derive metal-dependent period-luminosity-color\n(PLC) and period-Wesenheit (PW) relations. The latter were applied to a\nsample of Gaia Early Data Release 3 (DR3) Galactic Cepheids. The inferred\ntheoretical parallaxes were tested against Gaia astrometric results. By\ncombining this pulsational scenario with updated stellar evolution\npredictions and using the BASTI code\, we derived new and accurate metal-\ndependent Period-Age and Period-Age-Color relations\, which were applied to\nthe same sample of Galactic Cepheids in the Gaia DR3 to constrain their age\ndistribution. These results are all discussed in view of the incoming SPECTRUM\nproject that will represent the first attempt to systematically compute\nnonlinear convective pulsation models along stellar evolutionary tracks.
URL:https://www.oa-roma.inaf.it/event/colloquium-giulia-de-somma/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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