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The Peculiar Spectrum of the Extreme Helium Star BD−9°4395

Published online by Cambridge University Press:  12 April 2016

C.S. Jeffery
C.S. Jeffery*
Affiliation:
University ObservatoryBuchanan Gardens St Andrews Fife KY16 9LZScotland

Abstract

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The spectrum of the extreme helium star BD−9°4395 has already been noted for emission lines of Hel 3889Å and CII 4267Å. Further anomalies in the Hel and CII spectra have been observed, including the identification of additional emission lines, asymmetry in the He I line profiles and variability in all features. It is suggested that these features may be associated with other evidence for non-radial pulsations in BD−9°4395.

Type
III Hot Extreme Helium Stars
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 81 - 85
Copyright
Copyright © Reidel 1986

References

Burger, M., de Jager, C., van den Oord, G., & Sato, N., 1982. Astr.Astrophys., 107, 320.Google Scholar
Drilling, J.S., Schönberner, D., Heber, U. & Lynas-Gray, A.E., 1984. Astrophys.J., 278, 224 Google Scholar
Feast, M.W., 1979. IAU Colloq. No.46, p.246, eds Bateson, F.M., Smak, J. & Urch, I.H., University of Waikoto, Hamilton, New Zealand.Google Scholar
Heber, U., 1982. Astr.Astrophys., 118, 39 Google Scholar
Herbig, G.H., 1975. Astrophys .J., 199, 702.CrossRefGoogle Scholar
Jeffery, C.S., Skillen, I., Hill, P.W., Kilkenny, D., Malaney, R.A., & Morrison, K., 1985. Mon.not.R.astr.Soc., 217, 710 Google Scholar
Kaufmann, J.P. & Schönberner, D., 1977. Astr.Astrophys., 57, 169.Google Scholar
Olson, G.L., 1981. Astrophys.J., 245, 1054.Google Scholar
Odgers, G.J., 1955. Publs. Dominion astr.Obs., 10, 215.Google Scholar
Penrod, V. & Smith, M.A., 1985. NASA Conf.Publ.No.2358, ‘The Origin of Nonradiative Heating/Momentum in Hot Stars’ p.53, eds. Underhill, A.B. & Nichalitsianos, A.G. Google Scholar
Schönberner, D., 1977. Astr.Astrophys., 57, 437.Google Scholar
Smith, M.A. & Ebbetts, D., 1981. Astrophys.J., 247, 158.Google Scholar
Smith, M.A., 1983. Astrophys.J., 265, 338.CrossRefGoogle Scholar
Underhill, A.B., 1966. ‘The Early Type Stars’, D. Reidel, Dordrecht, Holland.Google Scholar
Walker, H., 1985. Astr. Astrophys., 152, 58.Google Scholar