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OB stars:
Early O-type stars:
-
A New Spectral Classification System for the Earliest O Stars
Definition of Type O2
(Walborn, Howarth, Lennon, Massey, Oey, Moffat,
Skalkowski, Morell, Drissen, Parker, 2002)
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The Galactic O-Star Spectroscopic Survey. I. Classification
System and Bright Northern Stars in the Blue-violet at R ~
2500
(Sota, Maíz Apellániz, Walborn, Alfaro, Barbá, Morrell, Gamen, 2011)
B-type stars & late O-type stars:
-
A 2dF survey of the Small Magellanic Cloud
(Evans, Howarth, Irwin, Brunley, Harries, 2004)
see Table 2
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The VLT-FLAMES Tarantula Survey. XVIII. Classifications and radial
velocities of the B-type stars
(Evans, Kennedy, Dufton, Howarth, Walborn, Markova, Clark, de Mink, de
Koter, Dunstall, Hénault-Brunet, Maíz Apellániz, McEvoy, Sana,
Simón-Díaz, Taylor, Vink, 2015)
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WR stars:
Slash stars, WN/Of:
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