Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715406w&link_type=abstract
American Astronomical Society, AAS Meeting #217, #154.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The ultraviolet spectral region of cool, luminous stars contains emission features that originate from fluorescent mechanisms via PAR (photo-excitation by accidental resonance). These mechanisms can account for numerous emission lines, downward transitions from upper energy levels pumped by strong transitions, such as H Ly-α, O I 1302, C II 1335, and Mg II h&k. A new, high S/N observation of the cool giant star λ Vel (K4 Ib-II) was obtained with the HST/COS instrument at a resolving power of R 20000 and covers the wavelength region from 132 nm to 147 nm. High-quality spectra (COS and GHRS) are now available from 128 nm to 147 nm, and at 12 moderate and high resolution observations from the HST/GHRS, the latter covering approximately a third of the wavelength interval from 189 nm to 285 nm. Using these data, together with observations from FUSE and IUE, we investigate PAR processes in the spectra of Cr II and Fe II and make comparisons with other stars. The presence of additional atomic (O I, S I, and Cl I) and molecular (H2, CO) PAR processes in the spectrum of λ Vel is briefly discussed.
Ayres Thomas R.
Brown Adrian
Carpenter Kenneth G.
Harper Graham M.
Wahlgren Glenn Michael
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