X-Ray spectroscopic investigation of the coronal structure of capella |
| |
Authors: | E. H. B. M. Gronenschild R. Mewe N. J. Westergaard J. Heise F. D. Seward T. Chlebowski N. P. M. Kuin A. C. Brinkman J. H. Dijkstra H. W. Schnopper |
| |
Affiliation: | (1) Space Research Laboratory, Utrecht, The Netherlands;(2) Danish Space Research Institute, Lyngby, Denmark;(3) Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass., USA;(4) Observatory Sonnenborgh, Utrecht, The Netherlands |
| |
Abstract: | The binary system Capella (G6 III + F9 III) has been observed on 1979 March 15 and on 1980 March 15–17 with the Objective Grating Spectrometer (OGS) onboard theEinstein Observatory. The spectrum measured with the 1000 l/mm grating covers the range 5–30 Å with a resolution < 1 Å. The spectra show evidence for a bimodal temperature distribution of emission measure in an optically thin plasma with one component 5 million degrees and the other one 10 million degrees. Spectral features can be identified with line emissions from O VIII, Fe XVII, Fe XVIII, Fe XXIV, and Ne X ions. Good spectral fits have been obtained assuming standard cosmic abundances. The data are interpreted in terms of emission from hot static coronal loops rather similar to the magnetic arch structures found on the Sun. It is shown that the conditions required by this model exist on Capella. Mean values of loop parameters are derived for both temperature components. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|