Mathematics – Logic
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..379w&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, April 1990, p. 379-411.
Mathematics
Logic
323
Astronomical Spectroscopy, B Stars, O Stars, Stellar Spectra, Astronomical Catalogs, Digital Techniques, Spectrum Analysis, Stellar Luminosity
Scientific paper
Some recent developments in the optical classification of OB spectra are reviewed in terms of a comprehensive atlas of new blue-violet digital data from the CTIO 1-meter photon-counting system. These developments include the O3 spectral type; luminosity criteria for the O stars; OBN/OBC anomalies; and refined, interpolated late-O/early-B types. Examples of these phenomena are included among extensive spectral- and luminosity-class sequences, comprising 75 standard objects arranged into 27 montages and covering the wavelength range 3950-4750 A for types O3-B3 (-B8 at Ia). It is intended that this atlas serve a reference function analogous to that of the printed MK atlases, for morphological investigations of OB spectra based on digital data, which will supersede photographic techniques in most future applications.
Fitzpatrick Edward L.
Walborn Nolan R.
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