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The H-R diagram of O-type subdwarfs

Published online by Cambridge University Press:  04 August 2017

J. S. Drilling  and
D. Schönberner
J. S. Drilling
Affiliation:
Louisiana State University Observatory, Baton Rouge, LA 70803-4001
D. Schönberner
Affiliation:
Institut für Theoretische Physik und Sternwarte, Universität Kiel

Extract

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A spectroscopic survey by Drilling (1983) of non-emission OB+ stars in the Case-Hamburg survey and its extension to b = ±30° for 1 = ±60° has turned up 12 hot, relatively bright O-type subdwarfs (V<13). Drilling's survey covers more than 13 times the area of the south galactic polar survey of Slettebak and Brundage (1971), but has revealed only the hottest and/or hydrogen-poor objects because only the weakest-lined 0-and B-type stars were observed. We have observed all of these stars in the large-aperture, low-resolution mode of the IUE satellite. A full description of their spectral appearance is given elsewhere (Schönberner and Drilling, 1984). The spectra were corrected for interstellar absorption using the Seaton (1979) reddening law to nullify the 2200 å interstellar feature, and in all cases EB-V < 0.25.

Type
I. EVOLUTION OF LOW AND INTERMEDIATE MASS STARS OBSERVATIONS AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 219 - 222
Copyright
Copyright © Reidel 1984 

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