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HR 7308: A Unique Cepheid+

Published online by Cambridge University Press:  12 April 2016

John R. Percy  and
Nancy Remage Evans
John R. Percy
Affiliation:
Erindale College* and David Dunlap Observatory University of Toronto Toronto, Canada M5S 1A7
Nancy Remage Evans
Affiliation:
Erindale College* and David Dunlap Observatory University of Toronto Toronto, Canada M5S 1A7

Abstract

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We have obtained photometric observations and radial velocities of the F6I-IIb star HR 7308. The spectral type, the period (1d.49), the relative range and phase of light, colour and velocity variations all suggest that the star is a small-amplitude Cepheid. The metal abundance appears to be normal. However, the light amplitude decreased slowly during 1978 from 0m.3 to 0m.1, and increased during 1979 and 1980 from 0m.05 to 0m.15. Such behaviour is unprecedented in a population I Cepheid.

Type
V. Cepheids of Populations I and II
Information
International Astronomical Union Colloquium , Volume 58: Stellar Hydrodynamics , August 1980 , pp. 425 - 428
Copyright
Copyright © Reidel 1980

References

Breger, M. 1969, Ap.J. Suppl., 19, 79.Google Scholar
Burki, G. and Mayor, M. 1980a, I.A.U. Inf. Bull. Var. Stars, #1728, 1.Google Scholar
Burki, G. and Mayor, M. 1980b, Astron. Astrophys., in press.Google Scholar
Cox, A.N., Hodson, S.W., and King, D.S. 1978, Ap.J., 220, 996.CrossRefGoogle Scholar
Deeming, T.J. 1975, Ap. Space Sci., 36, 137.Google Scholar
Demers, S. and Fernie, J.D. 1966, Ap.J., 144, 440.Google Scholar
Evans, N.R. 1974, Ph.D. Thesis, University of Toronto.Google Scholar
Fernie, J.D. 1972, A.J., 77, 150.CrossRefGoogle Scholar
Lane, M.C. and Percy, J.R. 1979, A.J., 84, 831.Google Scholar
Percy, J.R., Baskerville, I., and Trevorrow, D.W. 1979, Publ. Ast. Soc. Pacific, 91, 368.CrossRefGoogle Scholar
Stobie, R.S. 1969a, M.N.R.A.S., 144, 485.Google Scholar
Stobie, R.S. 1969b, M.N.R.A.S., 144, 511.Google Scholar