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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3158
DTSTART:20131205T213000Z
DTEND:20131205T230000Z
DTSTAMP:20260314T224154Z
LAST-MODIFIED:20131118T174354Z
LOCATION:4421 Sterling Hall
SUMMARY:“Star Formation\, Solar Physics\, and Stellar Astrophysi
 cs: A Data-Intensive Approach”\, Astronomy Colloquium\, Keivan S
 tassun\, Vanderbuilt University
DESCRIPTION:Large time-domain surveys\, from the ground and from space
 \, are enabling new data-intensive approaches to a variety of problems
  in stellar and solar astrophysics. This talk describes four projects\
 , each serving as a vignette of a different but complementary mode of 
 data-intensive research into the<br><br>
\nformation and evolution of 
 Sun-like stars. The SLoWPoKES project extracts from the Sloan Digital 
 Sky Survey the largest sample of wide low-mass binaries ever assembled
 \, which we use to constrain binary star formation theory and the role
  of third bodies in the formation of tight binaries. The EB Factory pr
 oject seeks to identify rare\, but astrophysically very interesting\, 
 case studies from among the large numbers of eclipsing binaries being 
 harvested by surveys for transiting exoplanets. We use a set of rare l
 ow-mass and brown-dwarf eclipsing binaries to elucidate the role of ma
 gnetic activity in altering the basic properties of low-mass stars and
  brown dwarfs\, affecting our understanding of the stellar initial mas
 s function and the frequency of brown dwarfs in stellar populations. T
 he X10000 Project studies the structures of young stellar coronae in o
 rder to understand the role of extreme coronal mass ejections in the a
 ngular momentum evolution of young stars. As a by-product of this work
 \, we have determined the first robust empirical relationship between 
 X-ray flare energy and coronal mass loss for the Sun. Finally\, we use
  the Kepler database of precision light curves for 150\,000 stars to p
 resent a new\, a Eurooephotometric variability HR diagrama Euro which 
 enables accurate determination of stellar surface gravities\, improves
  our knowledge of exoplanet properties\, and enhances our ability to i
 dentify the most radial-velocity quiet stars for exoplanet discovery.
URL:https://www.physics.wisc.edu/events/?id=3158
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