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Title:
Contemporary optical spectral classification of the OB stars - A digital atlas
Authors:
Walborn, Nolan R.; Fitzpatrick, Edward L.
Affiliation:
AA(Space Telescope Science Institute, Baltimore, MD), AB(Princeton University Observatory, NJ)
Publication:
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, April 1990, p. 379-411. (PASP Homepage)
Publication Date:
04/1990
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, B STARS, O STARS, STELLAR SPECTRA, ASTRONOMICAL CATALOGS, DIGITAL TECHNIQUES, SPECTRUM ANALYSIS, STELLAR LUMINOSITY
DOI:
10.1086/132646
Bibliographic Code:
1990PASP..102..379W

Abstract

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.

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