Coronal activity in F-, G-, and K-type stars. IV - Evidence for expanding loop geometries in stellar coronae

Details Coronal activity in F-, G-, and K-type stars. IV - Evidence for expanding loop geometries in stellar coronae Coronal activity in F-, G-, and K-type stars. IV - Evidence for expanding loop geometries in stellar coronae

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..484s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 1, 1989, p. 484-492. Research supported by SRON, SERC, and Lockhe

Astronomy and Astrophysics

Astrophysics

53

Coronal Loops, F Stars, G Stars, K Stars, Stellar Activity, Stellar Coronas, Astronomical Spectroscopy, Exosat Satellite, Stellar Magnetic Fields, X Ray Spectra

Scientific paper

A detailed analysis is presented of X-ray spectra of Capella and of Sigma2 CrB. The spectra of both stars are compatible with coronae consisting of two different ensembles of static loops with different maximum temperatures and ratios of the cross sectional areas at the loop top and at the footpoint. The cool (5 MK) loop components in both stars show evidence of relatively strong expansion with height. The hot (30 MK) components appear to expand much less.

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