Computer Science – Sound
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.279..317s&link_type=abstract
(Royal Society, Discussion on Astronomy in the Ultraviolet, London, England, Apr. 9, 10, 1974.) Royal Society (London), Philosop
Computer Science
Sound
1
Hydrogen Clouds, Interstellar Radiation, Line Spectra, Rocket Sounding, Stellar Spectra, Ultraviolet Spectra, Abundance, Atomic Spectra, Data Reduction, Far Ultraviolet Radiation, Fine Structure, Gas Temperature, Interstellar Gas
Scientific paper
Ten interstellar lines in the vacuum UV spectrum of delta Sco are analyzed which were recorded on rocket spectrograms. Two cloud components are resolved which have Doppler widths of 1.55 km/sec (larger cloud) and 2.16 km/sec (smaller cloud). Column densities are derived for C I, C II, N I, O I, Al II, Si II, and Fe II, and abundances relative to atomic hydrogen are determined from them. Silicon and iron are found to be slightly overabundant relative to the solar abundances, while the other elements are underabundant by factors ranging from 1.8 to 8.6. Mean cloud densities of 250 and 150 per cu cm (for the larger and smaller clouds, respectively) are determined, and the average ratios of electron density to hydrogen-atom density are derived using the column densities of C I and C II. It is shown that the iron abundance can be decreased to less than the solar abundance by doubling the velocity dispersion of the iron ions.
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