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SUMMARY:AIP Seminar | Kseniia Sysoliatina (AIP)
DTSTART:20260217T133000Z
DTEND:20260217T143000Z
DTSTAMP:20260728T180903Z
UID:www.aip.de-2383
CATEGORIES:Scientific
CATEGORIES:Scientific Talk
CATEGORIES:Public
CATEGORIES:AIP Seminar
CONTACT:Rainer Arlt <rarlt@aip.de>
DESCRIPTION:Speaker: Kseniia Sysoliatina (AIP)\nTitle: White Dwarfs as Pro
 bes of the Milky Way’s Star Formation History\nAbstract: Over the last d
 ecade\, the rapidly growing volume of data for faint Milky Way (MW) stars 
 has led to an increasing interest in white dwarf (WD) population. The Gaia
  mission has provided an unprecedented view of the WD sequence in the colo
 r–magnitude diagram and\, for the first time\, enabled the construction 
 of a complete local WD sample. Because the WD population retains a record 
 of the Galactic star formation history (SFH)\, it has begun to be increasi
 ngly used as a tracer for SFH reconstruction. However\, results obtained f
 rom WDs are often contradictory and show tension with the MW SFHs derived 
 from other\nstellar populations.\nIn this study\, I work within a framewor
 k of the semi-analytic Just–Jahreiß model of the Solar neighborhood. Us
 ing Gaia DR3 data and accounting for completeness limits\, I model all ste
 llar populations\, including WDs\, within 1 kpc from the Sun. The model is
  optimized using MCMC\, simultaneously constraining the SFH and IMF parame
 ters as well as key WD-model parameters\, such as the slopes of the initia
 l–final mass relation (IFMR) and a fraction of DA WDs. This allows to qu
 antify the impact of the WD model on the predicted WD star counts and SFH 
 parameters. I find that uncertainties in the WD modeling contribute strong
 ly to the total uncertainty in the predicted WD population. This shows tha
 t our current uncertainty in WD physics and evolution may propagate into t
 he SFH uncertainty and bias the SFH when it is derived from WDs alone\; ho
 wever\, WD populations can nevertheless provide an additional constraint o
 n the SFH when used in combination with other stellar populations.\n
LOCATION:AIP\; Kirch building\, Conference room
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