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Full-Text Articles in Physical Sciences and Mathematics
Ultraviolet Emission Lines Of Si Ii In Cool Star And Solar Spectra, Sibasish Laha, Francis P. Keenan, Gary J. Ferland, Catherine A. Ramsbottom, Kanti M. Aggarwal, Thomas R. Ayres, Marios Chatzikos, Peter A. M. Van Hoof, Robin J. R. Williams
Ultraviolet Emission Lines Of Si Ii In Cool Star And Solar Spectra, Sibasish Laha, Francis P. Keenan, Gary J. Ferland, Catherine A. Ramsbottom, Kanti M. Aggarwal, Thomas R. Ayres, Marios Chatzikos, Peter A. M. Van Hoof, Robin J. R. Williams
Physics and Astronomy Faculty Publications
Recent atomic physics calculations for Si ii are employed within the cloudy modelling code to analyse Hubble Space Telescope (HST) STIS ultraviolet spectra of three cool stars, β Geminorum, α Centauri A and B, as well as previously published HST/GHRS observations of α Tau, plus solar quiet Sun data from the High Resolution Telescope and Spectrograph. Discrepancies found previously between theory and observation for line intensity ratios involving the 3s23p 2PJ–3s3p2 4PJ' intercombination multiplet of Si II at ∼ 2335 Å are significantly reduced, as are those for …