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Title:
Why all stars should possess circumstellar temperature inversions
Authors:
Scudder, Jack D.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 1, p. 319-349. (ApJ Homepage)
Publication Date:
10/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmic Plasma, Stellar Envelopes, Stellar Temperature, Computational Astrophysics, Plasma Density, Stellar Coronas, Stellar Magnetic Fields, Stellar Structure, X Ray Spectra
DOI:
10.1086/171859
Bibliographic Code:
1992ApJ...398..319S

Abstract

The paper shows that the circumstellar temperature inversions possessed by all stars are the consequence of the 'velocity filtration' process described by Scudder (1992), according to which a stellar envelope is hotter than its underlying layers. The filtration scenario relies on the theoretically predicted and experimentally determined non-Maxwellian velocity distributions of ions and/or electrons in other sampled astrophysical plasmas and the transition region. The most immediate consequence is that the temperature and quasi-neutral plasma density become anticorrelated with increasing radius in a thin transition region, leaving the temperature profile inverted in excess of 10 exp 6 K up into a corona, without depositing a wave of magnetic field energy into the gas above the base of the transition region.

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