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HdBe stars: hydrogen-deficient supergiants with emission lines

Published online by Cambridge University Press:  26 May 2016

C.S. Jeffery
C.S. Jeffery*
Affiliation:
Dept of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, FIFE KY16 9SS, Scotland

Extract

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The hydrogen-deficient B stars (often known as extreme-helium stars: EHes) show weak or absent Balmer lines and the following properties (Heber 1986a): Teff ~ 12 − 25kK, log g ~ 2 − 3, log nH ~ −3 − −4, nHe ≈ 0.99, nC ~ 0.01. Their galactic positions and apparent magnitudes indicate that they are low-mass supergiants belonging to the Galactic bulge (Jeffery et al. 1987).

Type
5. Be Stars: Spectroscopy and Photometry
Information
Symposium - International Astronomical Union , Volume 162: Pulsation, Rotation and Mass Loss in Early-Type Stars , 1994 , pp. 329 - 330
Copyright
Copyright © Kluwer 1994 

References

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Heber, U.: 1986b, in Hunger, , Schönberner, & Rao, , ed(s)., Hydrogen-deficient Stars and Related Objects, IAU Coll. 87 , Reidel:Dordrecht, 73 Google Scholar
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