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- W2036004776 abstract "view Abstract Citations (23) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Measurement of coronal X-ray emission lines from Capella. Vedder, P. W. ; Canizares, C. R. Abstract The Einstein Observatory's Focal Plane Crystal Spectrometer has detected X-ray emission lines due to O VIII, Fe XVII, and Fe XX, from the binary star system Capella. Line luminosities are well fitted by an emitting plasma at a single temperature of 6.29 + or - 0.01 - 0.03 million K, and a volume emission measure of about 8.6 x 10 to the 52nd/cu cm, corresponding to the low temperature component previously observed. A high temperature component is undetectable, since the observed lines are not produced in plasma at temperatures above about 20 million K. Nearly isothermal plasma would be expected if many of the magnetically confined coronal loops have similar sizes and pressures, and a second population of longer loops would be required to account for the hotter component. An alternative interpretation of the observed X-ray line emission and upper limit is that the plasma contains a continuous distribution of emission measure versus temperature that rises sharply to 3 million K and then falls by nearly a decade to 16 million. An extrapolation of the loop sizes suggested by this alternative to hotter, longer loops may also account for the higher temperature emission. Publication: The Astrophysical Journal Pub Date: July 1983 DOI: 10.1086/161157 Bibcode: 1983ApJ...270..666V Keywords: Binary Stars; Emission Spectra; Stellar Coronas; Stellar Spectra; X Ray Sources; Focal Plane Devices; Iron; Line Spectra; Oxygen Spectra; Plasma Temperature; X Ray Spectra; Astrophysics full text sources ADS | data products SIMBAD (1)" @default.
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- W2036004776 date "1983-07-01" @default.
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- W2036004776 title "Measurement of coronal X-ray emission lines from Capella" @default.
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