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Definition of the Physical Problems Connected with Extended Atmospheres

Published online by Cambridge University Press:  08 February 2017

R. N. Thomas
R. N. Thomas*
Affiliation:
Joint Institute for Laboratory AstrophysicsBoulder, Colorado

Abstract

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The necessity of carefully defining the phenomenological basis for classification of atmospheres as being “extended” is emphasized, and four alternative bases for such classification are suggested (1) the necessity to include curvature terms; (2) the presence of an ejected shell surrounding a central star; (3) an observational discrepancy between predicted and observed density gradient; (4) an anomaly between predicted and observed phenomena in stars with “dynamic” atmospheres such as cepheids. A number of physical problems connected with the presence of an extended stellar atmosphere are then categorized according to these alternative bases.

Keywords

extended stellar atmospherclassical atmosphere model
Type
Part A. Type of Problems that Exist
Information
International Astronomical Union Colloquium , Volume 2: Spectrum Formation in Stars With Steady-State Extended Atmospheres , August 1970 , pp. 38 - 53
Copyright
Copyright © 1970

References

* Of the National Bureau of Standards and the University of Colorado.