Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.213..761a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 213, April 15, 1985, p. 761-771.
Astronomy and Astrophysics
Astronomy
12
Binary Stars, Stellar Coronas, Stellar Spectra, X Ray Binaries, Energy Spectra, Focal Plane Devices, Heao 2, High Resolution, Iron, Stellar Atmospheres, X Ray Spectra
Scientific paper
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)×106K and (1.74 with errors +0.55 and -0.69)×1053cm-3 respectively. Implications of these results are briefly discussed.
Agrawal Prahlad C.
Markert Thomas H.
Riegler Guenter R.
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