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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20191108T103000
DTEND;TZID=Atlantic/Canary:20191108T113000
UID:iactalks-1282
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1282
CREATED:2019-11-08T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Pushing the boundaries on the accuracy of fundamental stellar param
 eters
DESCRIPTION:Pushing the boundaries on the accuracy of fundamental stellar p
 arameters\nProf. Andrej Prsa\n\nMost of what we know about the masses and 
 radii of stars comes from the studies of eclipsing binary stars (EBs). As 
 the physical principles that govern the motion are well understood, modell
 ing EB data represents a tractable geometrical problem. The attained accur
 acy of fundamental parameters is ~2-3% in the best possible cases (Torres 
 et al. 2010), which plays a paramount role in stellar astrophysics: these 
 results are used to calibrate the mass-radius relationship, critically tes
 t stellar evolution models, provide fundamental parameters (temperature, l
 uminosity, mass and radius) for stellar and substellar objects across the 
 main sequence, and anchor the distance scale. Given that so much in stella
 r astrophysics hinges critically on the values derived from EBs, we natura
 lly wonder whether there are any circumstances that would allow us to beat
  down the uncertainties by another order of magnitude, say to a ~0.2-0.3% 
 level, and thus achieve a 10-fold increase in calibration and gauge reliab
 ility. This could be done if the correlations between parameters were some
 how reduced, and solution degeneracy somehow broken. If, for example, we h
 ad a third star in the system that happens to eclipse the binary, then the
  shapes of extraneous eclipses in a light curve would constrain the orbita
 l inclination and stellar radii much more than the binary eclipses alone. 
 In this talk, I will discuss these and similar considerations and show wha
 t Kepler, K2 and TESS missions brought to the table.
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