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BEGIN:VEVENT
UID:20260518T010612-04-6254ZSrUIe@https://astronomia.uc.cl/2jucext1/institu
 toastrofisica/
DTSTAMP:20260518T050612Z
DESCRIPTION:\nAll evolved stars of up to 2 solar masses undergo a helium co
 re flash at the end of their first stage as a giant star. Although theoret
 ically predicted more than 50 years ago\, this core flash phase has yet to
  be observationally probed. We show here that gravity modes stochastically
  excited by helium-flash-driven convection are able to reach the stellar s
 urface and induce periodic photometric variabilities in hot subdwarf stars
  with amplitudes of the order of a few thousandths of a magnitude. As such
 \, they can now be detected by space-based photometry with the Transiting 
 Exoplanet Survey Satellite in relatively bright stars (for example\, Johns
 on–Cousins magnitudes of IC???13?mag). The range of predicted periods span
 s from a few thousand seconds to tens of thousands of seconds\, depending 
 on the details of the excitation region. In addition\, we find that stocha
 stically excited pulsations reproduce the pulsations observed in a few hel
 ium-rich hot subdwarf stars. These stars\, particularly the future Transit
 ing Exoplanet Survey Satellite target Feige 46\, are the most promising ca
 ndidates to probe the helium core flash for the first time.\n&nbsp\; https
 ://astronomia.uc.cl/2jucext1/institutoastrofisica/en/instituto/seminarios/
 event/393-asteroseismic-signatures-of-the-helium-core-flash-dr-marcelo-m-m
 iller-bertolami-instituto-de-astrofisica-de-la-plata-unlp-conicet
DTSTART:20191111T161500Z
DTEND:20191111T164500Z
LOCATION:Seminar Room (Instituto de Astrofísica\, Pontificia Universidad Ca
 tólica\, Vicuña Mackenna 4860\, Santiago\, Chile)
SUMMARY:Asteroseismic signatures of the helium core flash (Dr. Marcelo M. M
 iller Bertolami\; Instituto de Astrofisica de La Plata -- UNLP-CONICET)
URL:https://astronomia.uc.cl/2jucext1/institutoastrofisica/en/instituto/sem
 inarios/event/393-asteroseismic-signatures-of-the-helium-core-flash-dr-mar
 celo-m-miller-bertolami-instituto-de-astrofisica-de-la-plata-unlp-conicet
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