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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-6682
DTSTART:20211021T203000Z
DTEND:20211021T220000Z
DTSTAMP:20260414T192236Z
LAST-MODIFIED:20211021T125816Z
LOCATION:4421 Sterling Hall\, Coffee and Cookies at 3:30 pm\, Talk sta
 rts at 3:45 pm
SUMMARY:Star Formation\, Solar Physics\, and Stellar Astrophysics: A D
 ata-Intensive Approach\, Astronomy Colloquium\, Keivan Stassun\, Vande
 rbilt 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 formation and evolution of Sun-like s
 tars. The SLoWPoKES project extracts from the Sloan Digital Sky Survey
  the largest sample of wide low-mass binaries ever assembled\, which w
 e use to constrain binary star formation theory and the role of third 
 bodies in the formation of tight binaries. The EB Factory project seek
 s to identify rare\, but astrophysically very interesting\, case studi
 es from among the large numbers of eclipsing binaries being harvested 
 by surveys for transiting exoplanets. We use a set of rare low-mass an
 d brown-dwarf eclipsing binaries to elucidate the role<br>
\nof magnet
 ic activity in altering the basic properties of low-mass stars and bro
 wn dwarfs\, affecting our understanding of the stellar initial mass fu
 nction and the frequency of brown dwarfs in stellar populations. The X
 10000 Project studies the structures of young stellar coronae in order
  to understand the role of extreme coronal mass ejections in the angul
 ar momentum evolution of young stars. As a by-product of this work\, w
 e have determined the first robust empirical relationship between X-ra
 y flare energy and coronal mass loss for the Sun. Finally\, we use the
  Kepler database of precision light curves for 150\,000 stars to prese
 nt a new\, “photometric variability HR diagram” which enables accu
 rate determination<br>
\nof stellar surface gravities\, improves our k
 nowledge of exoplanet<br>
\nproperties\, and enhances our ability to i
 dentify the most radial-velocity quiet stars for exoplanet discovery.<
 br>
\n<br>
\n We strongly encourage you to attend the colloquium in pe
 rson. If that is impossible\, it is available over zoom at the followi
 ng link:<br>
\n<br>
\nhttps://us02web.zoom.us/j/88024178440?pwd=Sk5tRX
 dLVWJTc0RkUXEwblRaa3RvQT09<br>
\n<br>
\n
URL:https://www.physics.wisc.edu/events/?id=6682
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