Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..102s&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 102-111.
Astronomy and Astrophysics
Astrophysics
45
Interstellar Matter, Oao 3, Stellar Spectra, Ultraviolet Spectra, Abundance, H Ii Regions, Stellar Mass Ejection, Supernova Remnants, Wolf-Rayet Stars
Scientific paper
Copernicus UV data on interstellar lines toward HD 50896, a Wolf-Rayet star, are analyzed to study abundances and physical conditions in the line of sight. About 20% of the low-velocity neutral gas is contained in a dense cloud with 10% to 50% of its hydrogen in molecular form; the atomic abundances show typical interstellar depletions. The low-velocity H II gas may be associated with the high ionizing flux of the Wolf-Rayet star or with H II regions along the line of sight. Si III exhibits strong absorption shortward of the low-velocity H II gas, characteristic of a collisionally ionized component at 30,000 to 80,000 K; the possible connections with an unobserved supernova remnant or stellar mass loss are discussed. High-velocity features at 78 and -96 km/sec, in which Fe and Si are near their cosmic abundances, are also indicative of strong shocks.
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