Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980saosr.389...47s&link_type=abstract
Cool Stars, Stellar Systems, and the Sun, SAO Special Report #389. Edited by A.K. Dupree, 1980, p. 47, 1980
Astronomy and Astrophysics
Astronomy
10
Heao 2, Late Stars, Spectral Emission, Stellar Spectra, X Ray Astronomy, X Ray Spectroscopy, Abundance, Binary Stars, Line Spectra, Solid State Devices, Stellar Coronas, Stellar Luminosity
Scientific paper
The solid state spectrometer on the Einstein Observatory determined .4 - 4.5 keV spectra for Capella, Algol and 6 RS CVn binaries. All show evidence for a bimodal distribution of emission measure with temperature with one component approximately 7 million degrees and one approximately 40 million degrees. The spread in values of both luminosity and emission measure is 10 for the low temperature component and approximately 500 for the high temperature component. Line emission due to Fe can be identified in most of them and abundances of Si, S and Fe are consistent with approximately solar values in all cases. Estimates indicate dimensions of the emitting regions are on the order of the stellar size and the binary separation for the low and high temperature components, respectively, unless the pressures are high. Variations in the flux were observed, mostly in the hard component for the RS CVn binaries, in the soft component for Capella. A flare was observed during primary eclipse of Algol. The possibility is discussed that the other variations could all be due to intrinsic variability with a time scale of hours-days rather than eclipse or modulation with photometric phase.
Swank Jean H.
White Nicholas E.
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