A classification system for O-B2 stars based on the SI IV and C IV resonance lines

Details A classification system for O-B2 stars based on the SI IV and C IV resonance lines A classification system for O-B2 stars based on the SI IV and C IV resonance lines

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1658h&link_type=abstract

Astronomical Journal, vol. 86, Nov. 1981, p. 1658-1670.

Astronomy and Astrophysics

Astronomy

20

Astronomical Catalogs, B Stars, Carbon Stars, O Stars, Resonance Lines, Silicon, Absorption Spectra, Ion Production Rates, Iue, Line Spectra, Skylab Program, Stellar Luminosity, Stellar Temperature, Ultraviolet Spectra

Scientific paper

Low-dispersion ultraviolet spectra from Skylab Experiment S-019 are used to explore the variations of Si IV and C IV line strengths with temperature and luminosity. These considerations lead to a classification system in which the Si/C ratio is used to discriminate luminosity among the O stars and temperature among the O9-B2 stars of lower luminosity. Stars falling in these two regimes may be distinguished either by the presence of C IV emission or on the basis of C IV absorption strength. The log(Si IV/C IV) vs C IV diagram is proposed as a primary tool in such a classification system. The rapid variation in the Si IV/C IV ratio from less than 1/10 at O9 to greater than 10 at B1.5 for luminosity class III-V stars appears to be an especially useful criterion for the temperature classification of stars in this spectral range.

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