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UID:aba90dac-22bf-4405-a0e6-9343210bb342@nexttoyou
DTSTAMP:20261106T173331Z
DTSTART:20261111T203000Z
DTEND:20261111T213000Z
SUMMARY:Special Seminar: Big Pulsations in Small Stars: The Remarkable Pop
 ulation of Large-Amplitude Hot-Subdwarf Pulsators
LOCATION:207 Phillips Hall
DESCRIPTION:Speaker: Corey Bradshaw (University of Hamburg)\n\nTitle: Big 
 Pulsations in Small Stars: The Remarkable Population of Large-Amplitude H
 ot-Subdwarf Pulsators\n\nAbstract: B-type hot subdwarfs (sdBs) are a rare
  class of evolved stars occupying a sparsely populated region of the Hert
 zsprung–Russell diagram. Their existence is not readily explained by stan
 dard single-star evolutionary channels\, indicating that binary interacti
 ons play a key role in their formation. In recent years\, several classes
  of sdB-like stars have been found to exhibit remarkably large-amplitude\
 , short-period pulsations dominated by low-order radial modes. These incl
 ude radial-mode sdB variables (rm-sdBVs) and blue large-amplitude pulsato
 rs (BLAPs). The most extreme examples\, the BLAPs\, undergo dramatic chan
 ges in radial velocity\, effective temperature\, and surface acceleration
  as their radii vary drastically over short pulsation cycles of less than
  an hour. These pulsations can even be violent enough to generate shocks 
 in the stellar atmosphere during phases of extreme compression. Despite t
 heir extraordinary behavior\, the evolutionary origins of these objects r
 emain largely unconstrained. Proposed formation pathways include envelope
  stripping by a binary companion\, white-dwarf mergers\, and even the sur
 viving companions of Type Ia supernovae. These scenarios predict differen
 t stellar mass ranges and evolutionary states\, making detailed spectrosc
 opic observations essential for measuring their properties and dis\n\nhtt
 p://next-to-u.app/events/aba90dac-22bf-4405-a0e6-9343210bb342
URL:http://next-to-u.app/events/aba90dac-22bf-4405-a0e6-9343210bb342
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