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High Spectral Resolution Observations of Coronal X-Ray Emission from the RS CVn Binary Sigma Corona Borealis

Published online by Cambridge University Press:  12 April 2016

G.R. Riegler ,
P.C. Agrawal  and
T.H. Markert
G.R. Riegler
Affiliation:
Jet Propulsion Laboratory, Pasadena, CA 91109
P.C. Agrawal
Affiliation:
Tata Institute of Fundamental Research, Bombay, India
T.H. Markert
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139

Extract

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Results of a high spectral resolution observation of the RS CVn binary σ Cr B, made with the Focal Plane Crystal Spectrometer (FPCS) on the Einstein Observatory, are reported. A spectral scan in the 800–840 eV interval shows clear presence of an X-ray emission line at 826 eV identified with the 1S0 − 1P1 transition of Fe XVII. A prominent peak at 1007 eV in the scan band 987–1013 eV is attributed to a blend of lines due to Fe XVII and Fe XXI. Using the observed line fluxes and the Raymond-Smith model, best fit values of corona temperature and volume emission measure, with associated 90% confidence level uncertainties, are derived to be (6.9 ± 0.8) × 106 K and (1.7 ± 0.7) × 1053 cm−3, respectively. Pressure and density of the X-ray emitting plasma and loop length are deduced by applying a Constant Pressure Coronal Loop Model.

Type
Session 6. Poster Papers
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 143 - 146
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

Footnotes

*

Guest Investigators with the Einstein Observatory

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