Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40....3s&link_type=abstract
(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews
Astronomy and Astrophysics
Astronomy
25
Cool Stars, Late Stars, Magnetic Stars, Stellar Magnetic Fields, Stellar Spectrophotometry, X Ray Spectra, Emission Spectra, Radiant Flux Density, Spectral Resolution, Stellar Activity, Stellar Atmospheres, Stellar Rotation, Stellar Temperature
Scientific paper
Aspects of magnetic activity of late-type stars are reviewed: first, results obtained through the comparison of emissions from various temperature regimes in the outer atmospheres of cool stars, then results from stellar soft X-ray spectroscopy. Spectra obtained with different instruments (Imaging Proportional Counter and Solid State Spectrometer on board the Einstein satellite, and the Objective Grating Instruments on board Einstein and Exosat) are interpreted through fits with model spectra consisting of one or two temperature components. Particular attention is given to the analysis of Exosat spectra of Procyon, Capella, and Sigma 2 CrB. Finally various relations between rotation and different measures of activity are compared. The effective X-ray temperature, derived from single-temperature fits to soft X-ray IPC spectra, is shown to play a part in the relation between activity and rotation.
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