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NRP Modes in a Be Star Zeta Oph

Published online by Cambridge University Press:  12 April 2016

E. Kambe ,
R. Hirata ,
M. Kato ,
H. Ando ,
E. J. Kennelly ,
G. A. H. Walker ,
S. Štefl  and
A. E. Tarasov
E. Kambe
Affiliation:
Department of Geoscience, National Defense Academy, Yokosuka, Kanagawa 239, Japan
R. Hirata
Affiliation:
Dept of Astronomy, Kyoto University, Kyoto 606-01, Japan
M. Kato
Affiliation:
Dept of Astronomy, Kyoto University, Kyoto 606-01, Japan
H. Ando
Affiliation:
National Astronomical Observatory, Mitaka 181, Japan
E. J. Kennelly
Affiliation:
Department of Geophysics and Astronomy, University of British Columbia, Vancouver, BC, V6T1Z4, Canada
G. A. H. Walker
Affiliation:
Department of Geophysics and Astronomy, University of British Columbia, Vancouver, BC, V6T1Z4, Canada
S. Štefl
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic, CZ-251 65 Ondrejov, Czech Republic
A. E. Tarasov
Affiliation:
Crimean Astrophysical Observatory, Nauchnyj, Crimea, 334413, Ukraine

Abstract

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Two large sinusoidal variations with periods of 3.337 hrs and 2.018 hrs and other smaller variations have been detected from the period analysis of Hel Λ 6678 spectra obtained by our multi-site campaign for ζ Oph in May, 1993. The resultant periodgram is considerably improved (aliasing free) from those in previous publications. The periodicity may be consistent with previous studies except ambiguities of aliasing. It is surprising that almost all detected periods have a common superperiodicity of about 10.05 hrs. We emphasise the importance of multi-site campaign for the study of line-profile variations (lpv) in early-type stars.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 301 - 302
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

Hirata, R. 1994, Be Newsletter, No. 28, p.11 Google Scholar
Kambe, E., Ando, H., & Hirata, R. 1993, A&A, 273, 435 Google Scholar
Reid, A.H.N., et al. 1993, ApJ, 417, 338 Google Scholar