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Two Modes of Pulsation in the Rapidly Rotating O9.5 Dwarf, HD 93521

Published online by Cambridge University Press:  12 April 2016

A.H.N. Reid ,
D. Bohlender ,
C.T. Bolton ,
A.W. Fullerton ,
I.D. Howarth ,
C. Manz ,
K.C. Smith  and
R.H.D. Townsend
A.H.N. Reid
Affiliation:
Dept. Physics and Astronomy, University CollegeLondon, Gower Street, London WC1E 6BT, United Kingdom
D. Bohlender
Affiliation:
Canada-Prance-Hawaii Telescope Corporation, P.O. Box 1597, Kamuela, Hawaii, USA96743
C.T. Bolton
Affiliation:
David Dunlap Observatory, P.O. Box 360, Richmond Hill, Ontario, CanadaL4C 4Y6.
A.W. Fullerton
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85740 Garching bei München, Germany
I.D. Howarth
Affiliation:
Dept. Physics and Astronomy, University CollegeLondon, Gower Street, London WC1E 6BT, United Kingdom
C. Manz
Affiliation:
David Dunlap Observatory, P.O. Box 360, Richmond Hill, Ontario, CanadaL4C 4Y6.
K.C. Smith
Affiliation:
Dept. Physics and Astronomy, University CollegeLondon, Gower Street, London WC1E 6BT, United Kingdom
R.H.D. Townsend
Affiliation:
Dept. Physics and Astronomy, University CollegeLondon, Gower Street, London WC1E 6BT, United Kingdom

Abstract

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We present preliminary results of a time-series analysis on the He II λ4541Å, Si III λλ4552, 4567, 4575Å and Hβ λ486lÅ lines of the late O-type dwarf, HD 93521. The spectra show line-profile variations (lpv) − ‘bumps’ and ‘dips’ − of amplitude ∼ 1% of the continuum, moving systematically redwards through the photospheric absorption lines. The analysis implies non-radial pulsation (NRP) as the origin for the lpv.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 309 - 310
Copyright
Copyright © Astronomical Society of the Pacific 1995

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