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BEGIN:VEVENT
DTSTAMP:20260629T234653Z
DTSTART;VALUE=DATE-TIME:20110316T163000
DTEND;VALUE=DATE-TIME:20110316T174500
SUMMARY:Prof. Boris Gaensicke (91¸£Àû)
TZID:Europe/London
UID:20110316-094d43ed2ea503a4012ea55d42f10841@warwick.ac.uk
CREATED:20110311T144115Z
DESCRIPTION:Dance of Death in the Stellar Graveyard Just like all of us\,
  stars go through a cycle of birth\, life and death. In this talk\, I wi
 ll explore our knowledge regarding the afterlife of stars. Most stars en
 d their lives as white dwarves\, burnt out stellar embers held up by the
  pressure of degenerate electrons. Many white dwarfs monotonously fade a
 way\, and serve both as laboratories for physics under extreme condition
 s\, as well as cosmic chronometers measuring the age of the Galaxy. Howe
 ver\, quite a few of them face a less peaceful future\, undergoing vario
 us types of interaction and accretion. If fed by a companion star\, a wh
 ite dwarf may grow in mass up to the Chandrasekhar mass\, and explode in
  type Ia supernova\, bright enough to serve as a beacon on cosmological 
 distances. Yet the details of the pathway to these cataclysmic events is
  far from being understood. Less extreme\, but closer to home\, are whit
 e dwarfs hosting the remnants of planetary systems. Asteroids crossing t
 he tidal disruption radius of their host white dwarf will be shredded in
 to a disc of gas and dust. This circumstellar debris is accreted into th
 e pure hydrogen atmosphere of the white dwarf\, and measuring the amount
 s of contamination provides an accurate chemical fingerprint of the cons
 tituents of extra-solar terrestrial material.
LOCATION:
CATEGORIES:Departmental Colloquium
LAST-MODIFIED:20110311T144115Z
ORGANIZER;CN="":
END:VEVENT
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