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The Early Evolution of Protostars

Thursday, September 16, 2010

UVA/NRAO Colloquium, National Radio Astronomy Observatory, Charlottesville

 

Neal Evans

Edward Randall, Jr. Centennial Professor of Astronomy

University of Texas at Austin, Austin, TX 78712

E-mail: nje@astro.as.utexas.edu

Research Page: http://www.as.utexas.edu/astronomy/people/evans_n/evans_n.html

 

Abstract

The early evolution of protostars will be reviewed with emphasis on what has been learned from studies by Spitzer and early Herschel data. The distinction between Classes and Stages will be emphasized and the timescales spent in different Classes will be estimated. Recent discoveries of candidates for the First Hydrostatic Core stage of evolution will be discussed. The evidence for episodic accretion will be reviewed, including some chemical consequences. Early Herschel results will be introduced as available, including evidence for highly excited CO, OH, and water emission.