Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasp..112.1446w&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 112, Issue 777, pp. 1446-1454.
Astronomy and Astrophysics
Astronomy
26
Atlases, Stars: Early-Type, Stars: Supergiants
Scientific paper
High signal-to-noise, optical digital classification spectrograms of three northern very early O supergiants and four late O supergiants with CNO anomalies are illustrated and discussed. Several of these exceptional objects either are the prototypes of their classes, originally discovered photographically, or are unique representatives of them in the northern hemisphere. The full blue-violet and yellow-red spectrum of the extreme ON supergiant BD +36°4063, discovered by G. Mathys with limited wavelength coverage, is shown for the first time. Extensive line identifications are provided, and the high quality of these data reveals numerous new absorption and emission features corresponding either to the high ionization in the case of the very early objects, or to the chemical abundance anomalies in the later ones. These data provide standards for digital classification of related objects in the north and guidance for subsequent astrophysical analyses with higher spectral resolution.
Howarth Ian D.
Walborn Nolan R.
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