Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..123j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 1, 1991, p. 123-128. Research supported by SE
Astronomy and Astrophysics
Astronomy
13
Emission Spectra, K Stars, Silicon, Spaceborne Astronomy, Ultraviolet Emission, Electron Transitions, Hubble Space Telescope, Iue, Line Spectra, Radiative Transfer
Scientific paper
The present study compares ratios of Si II UV emission lines in a variety of objects with computations based on recently published collisional data of Dufton and Kingston (1991). A high-quality spectrum of Alpha Tau (K5 III) obtained by Carpenter et al. (1991) is analyzed using the G270M mode of the GHRS on the HST, in addition to high-dispersion data from Skylab and IUE. Agreement between observation and theory is satisfactory for most lines. A blend with a line of Ni II accounts partially for the discrepancies and solves a problem with semiforbidden S II emission measures. Disagreement exists between certain observed flux ratios and computed values using recent atomic data for the intersystem lines. The discrepancy is most significant for Alpha Tau. The computed atomic collision strengths within the intersystem multiplet itself are argued as a possible cause of the discrepancy.
Carpenter Kenneth G.
Harper Graham M.
Judge Philip G.
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