Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5886l&link_type=abstract
HST Proposal ID #5886
Physics
Hst Proposal Id #5886 Cool Stars
Scientific paper
With the brightest UV emission line spectrum of any late-type star, Capella provides an excellent target for detailed studies of physical processes occuring in magnetically heated plasmas, commonly called transition regions, at temperatures of 10^4 - 10^5 K. In our recently completed analysis of GHRS spectra of Capella (Linsky et al. 1994), we find three distinct transition regions in the Capella system -- the plasma on the hotter star (G1 III) that emits moderately broad lines, the plasma on the cooler star (G8 III) that emits narrow lines, and microflaring plasma on the hotter star that emits very broad lines. We now propose a follow-up study to answer the critical new questions raised in the previous work that require analysis of a very different data set. Our objectives are (1) to determine the relative roles of recombination and collisional excition in the formation of the He II 1640 Angstrom line in both stars, (2) to obtain accurate values of the electron density in both the moderately broad and very broad line regions on the hotter star, (3) to obtain an accurate measurement of the differential emission measure distribution of the microflaring component, and (4) to measure the coronal Fe XXI 1354 Angstrom and Fe XII 1349 Angstrom lines for comparison with models based on x-ray data and to determine their Doppler shift and coronal turbulence. The analysis of the requested data will form a portion of Brian Wood's Ph.D thesis.
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