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What Do We Know Through Spectral Information on Stellar Chromospheres and Coronas?

Published online by Cambridge University Press:  08 February 2017

Françoise Praderie
Françoise Praderie*
Affiliation:
Observatoire de Paris, Section d 'Astrophysique de Meudon

Abstract

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Four problems in interpreting spectra to infer chromospheres-coronas are summarized. (1) The a priori difficulties in interpreting spectra lie in uncertainty on the range of possible models, coming from uncertainty as to which conservation equations may be applied, and from lack of an exhaustive list of spectral indicators that may be used for uniqueness tests. (2) As spectral indicators we consider: emission lines, self-reversed emission cores, the presence of He I lines in stars not of early type, coronal-type high ionization, excess continuum emission in the rocket UV and the far infrared. (3) To determine what we can infer from observations, we summarize information: inferred by comparison of models to data, on velocity fields, and on spectral variability which might suggest chromospheric activity. (4) We summarize the evidence for chromospheres in A stars, as being those where convection-induced acoustic heating is marginal.

Keywords

chromosphercoronspectral indicatorconservation equations
Type
Part C. Chromospheres and Coronae of Stars
Information
International Astronomical Union Colloquium , Volume 2: Spectrum Formation in Stars With Steady-State Extended Atmospheres , August 1970 , pp. 239 - 258
Copyright
Copyright © 1970

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