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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20230321T170000
DTEND;TZID=Atlantic/Canary:20230321T180000
UID:iactalks-1671
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1671
CREATED:2023-03-21T17:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:IAU G5 seminar: " How White Dwarfs Get Their Metals"
DESCRIPTION:IAU G5 seminar: " How White Dwarfs Get Their Metals"\nDr. Scott
  Kenyon\n\n \nMany (perhaps most) nearby white dwarfs have strong&nbs
 p;\nabsorption lines from Ca, Si, Mg, Al, and other metals \non 
 optical and ultraviolet spectra. Abundance analyses \nsuggest the ens
 emble of metals has a composition similar \nto asteroids or the cores
  of rocky planets. The atmospheric\ndiffusion times are much smaller than 
 their ages. Thus, the \nmetals must be continually replenished. 
  I will describe \nobservations of these systems and outline an evolu
 tionary \npath that allows material from an erstwhile planetary syste
 m\nto end up on the surface of the white dwarf remnant of an\nA-type main 
 sequence star.
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