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X-WR-CALNAME:Physics and Astronomy Departmental Colloquium (Prof. Gerard Wi
 lliger)
BEGIN:VEVENT
UID:0c0f1935-4f97-49f2-a6a7-9001cba5ae62@events.louisville.edu
DTSTAMP:20260930T042328Z
DTSTART:20261002T190000Z
DTEND:20261002T200000Z
SUMMARY:Physics and Astronomy Departmental Colloquium (Prof. Gerard Willige
 r)
CONTACT:Swagato Banerjee\, 502 852 0915\, email:swagato.banerjee@louisville
 .edu
DESCRIPTION:Speaker: Prof.  Gerard Williger (University of Louisville)\n\
 nDate: Friday October 2, 2026, 3-4 p.m.\n\nPlace: Natural Sciences Buildi
 ng, Room 112 \n\nTitle: Spectroscopy and Photometry of Young Solar-mass 
 Stars in the Chamaeleonis 1 Star-Forming Region\n\nAbstract: \n\nThe mech
 anisms producing variability in young solar-mass ("T Tau")\nstars are comp
 lex, and are influenced by accretion changes, dust\nin the surrounding dis
 k, starspots etc.  The innermost parts of their\ndisks cannot be resolved
  by current high-resolution imagery, but can\nbe probed by high resolution
  spectroscopy and high time resolution\nphotometry.  The Konkoly Observat
 ory star formation group has a project to\ninvestigate a sample of 6 T Tau
  stars in the Chamaeleonis 1 (Cha 1)\ncomplex, one of the closest star for
 mation regions.  The group\nreceived time on ESO and SMARTS telescopes fo
 r spectroscopy and\nphotometry of the sample, contemporaneous with a TESS 
 campaign in\n2019, and combined the data with ground-based photometry from
 \nlong-term photometric monitors such as ASAS-SN.\n\n     The first thr
 ee Cha 1 targets were analysed and published by G.\nZsidi and E.  Fiorell
 ino, and yielded clues to rotation rates, the\ncircumstellar dust content,
  accretion rate variability and wind\ncomponent features.  Here, I give a
  status report on the remaining 3\nstars in the project: CT Cha, VZ Cha an
 d WW Cha.  I will present 25\nyears of data including light curves, Lomb-
 Scargle periodograms and\ncolour-magnitude diagrams, describe emission lin
 e profile variability,\nand give a preview of work to be done to determine
  accretion rates. 
GEO:38.2139;-85.7597
LOCATION:Natural Sciences Building
URL:https://events.louisville.edu/events/physics-and-astronomy-departmental
 -colloquium-prof-gerard-williger/2026-10-02
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