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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-8188
DTSTART:20230209T213000Z
DTEND:20230209T223000Z
DTSTAMP:20260408T025109Z
LAST-MODIFIED:20230203T142057Z
LOCATION:4421 Sterling Hall
SUMMARY:Blue Stragglers\, Blue Lurkers and Stars that Go Bump In the N
ight\, Astronomy Colloquium\, Robert Mathieu\, University of Wisconsin
- Madison
DESCRIPTION:A substantial fraction of evolved late-type stars in the M
ilky Way have
\nevolved along alternative stellar evolutionary pat
hs in binary systems\, both
\nin star clusters and in the field. A
s a case in point\, in the 4-Gyr open
\ncluster M67\, 25% of the e
volved stars do not lie on the single-star
\nevolutionary isochron
e. Thus\, understanding these alternative stellar
\nevolutionary p
aths are essential to understanding stellar evolution\, and to
\nc
orrectly interpret ensemble studies of stars in the Milky Way.
\n
\nToday\, blue stragglers are seen as the most evident part of a
much larger
\npopulation of evolved stars that do not fall on a cl
assical single-star
\nevolutionary path. Indeed recently this pop
ulation has suddenly grown
\nfurther to include a population of su
ch stars lurking within main sequences.
\nAll of these stars trace
major alternative pathways of stellar evolution.
\nThey are not a
nomalous.
\n
\nOver the last decade observations have shown t
hat most of these stars are
\nthemselves binary stars. Relatedly\,
theory has argued that they likely form
\nfrom an array of proces
ses within binary stars\, including mass transfer\,
\nmergers\, co
llisions\, and rapid rotation. I will tell of this discovery
\njou
rney through the landscape of rich open clusters.
URL:https://www.physics.wisc.edu/events/?id=8188
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