High spectral resolution observations of the coronal X-ray emission from the RS CVn binary σ corona borealis

Agrawal, P. C. ; Markert, T. H. ; Riegler, G. R. (1985) High spectral resolution observations of the coronal X-ray emission from the RS CVn binary σ corona borealis Monthly Notices of the Royal Astronomical Society, 213 . pp. 761-771. ISSN 0035-8711

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Abstract

Results of the high spectral resolution observation of the RS CVn binary σ CrB, made with the Focal Plane Crystal Spectrometer (FPCS) on the Einstein Observatory, are reported. A spectral scan in 800 - 840 eV interval shows clear presence of X-ray emission line at 826 eV identified with 1S0-1P1 transition of Fe XVII while a prominent peak at 1007 eV in the scan band 986 - 1014 eV is attributed to a blend of lines due to highly ionized iron. Using the observed fluxes of the lines and the Raymond-Smith model, best-fit values of corona temperature and volume emission measures are derived to be (6.92 with errors +0.84 and -0.75)x106K and (1.74 with errors +0.55 and -0.69)x1053cm-3 respectively. Implications of these results are briefly discussed.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
ID Code:87086
Deposited On:14 Mar 2012 14:28
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