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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1024
DTSTART:20080212T214500Z
DURATION:PT1H0M0S
DTSTAMP:20260409T030628Z
LAST-MODIFIED:19700101T060000Z
LOCATION:6515 Sterling Hall (coffee at 3:30 pm)
SUMMARY:The Evolution of the Earliest Stages of Low-mass Star Formatio
 n\, Astronomy Colloquium\, Yancy Shirley\, University of Arizona
DESCRIPTION:Low-mass starless cores are the incipient phase of low-mas
 s star formation. They are observed via submillimeter dust continuum a
 nd dense gas molecular lines\, they typically contain a few solar mass
 es\, they have sizes of approximately 0.1 pc\, and they may form one o
 r a few low-mass (M ~ 1 M_sun) stars. It is crucial to understand the 
 formation and evolution of these objects to set the initial conditions
  for protostar and disk formation. Theoretically\, the basic core form
 ation and evolution process is still debated between a turbulent-domin
 ated or ambi-polar diffusion-dominated model. Observationally\, a fund
 amental challenge is to determine the evolutionary state of a starless
  core. I shall review the basic processes that are used to develop a c
 hemical evolutionary sequence for low-mass starless cores and that bre
 aks currently observed degeneracies in thephysical structure of the co
 res. I shall highlight results from the Arizona Radio Observatory-Gree
 n Bank Telescope Survey which has mapped a sample of 25 nearby starles
 s cores in dust continuum emission and 10 molecular transitions. 
URL:https://www.physics.wisc.edu/events/?id=1024
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