Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..217m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 217-224.
Astronomy and Astrophysics
Astrophysics
3
Early Stars, Ionized Gases, Stellar Mass Accretion, Stellar Spectra, Stellar Winds, Ultraviolet Spectra, Absorption Spectra, Abundance, Interstellar Extinction, Interstellar Gas, Oao 3, Positive Ions, Radial Velocity, Red Shift, Spectral Line Width, Stellar Coronas, Sulfur
Scientific paper
High-resolution Copernicus scans in 1980 from 1061.8 to 1064.6 A and 1072.1 to 1074.9 A along with short scans in 1972 or 1973 from 1062.4 to 1063.0 A have been used to check the report by Snow and Morton (1976) of infalling S IV ions in 15 Mon, Tau CMa, and Iota Ori. The original lower resolution data were found to be misleading. Nevertheless, a shift of about +50 km/s in 1972 has been confirmed in Iota Ori, and a possible shift of about +15 km/s in 1973 is suspected in Tau CMa. However, by 1980 the S IV in both stars had changed to outflow velocities somewhere between -30 and -140 km/s. On both occasions, 15 Mon showed no evidence of shifts. New data also have been obtained on the interstellar absorption of S IV, Cl II, and Fe II toward these stars.
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