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Ultraviolet Spectroscopy of Cool Stars from IUE

Published online by Cambridge University Press:  12 April 2016

C. Jordan ,
P. Judge  and
S. Johansson
C. Jordan
Affiliation:
Department of Theoretical Physics, University of Oxford, UK.
P. Judge
Affiliation:
Department of Theoretical Physics, University of Oxford, UK.
S. Johansson
Affiliation:
Fysiska Institutionen, Lunds University, Sweden

Abstract

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Observations of cool stars with the IUE satellite have shown that although main sequence stars have uv spectra similar to that of the sun, the spectra of the giants and supergiants are dominated by lines of neutral atoms and singly charged ions. The atmospheres of the low gravity stars are greatly extended and there is a large opacity in the stronger lines. This leads to multiple scattering and the appearance of many transitions through line ‘leakage’.

A review is given of how high resolution IUE spectra have allowed line identifications to be established and some current problems are discussed.

The spectroscopic diagnostic techniques for the low gravity, low density atmospheres are also briefly outlined.

Type
Session 3. Non-Solar Astrophysics
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 51 - 58
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

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