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β Cephei Pulsation Anomalies: Potential New Windows into the Instabilities and Evolution of Early B Stars

Published online by Cambridge University Press:  15 February 2018

B.A. Goldberg ,
R.S. Polidan ,
R.A. Crowe ,
G.C.L. Aikman ,
R.J. Bambery ,
J.T. Gathright  and
G.J. Odgers
B.A. Goldberg
Affiliation:
Jet Propulsion Laboratory/Caltech, Pasadena, CA, U.S.A.
R.S. Polidan
Affiliation:
NASA Goddard Spaceflight Center, Greenbelt, MD, U.S.A.
R.A. Crowe
Affiliation:
University of Hawaii at Hilo, HI, U.S.A.
G.C.L. Aikman
Affiliation:
Dominion Astrophysical Observatory, Victoria, BC, Canada
R.J. Bambery
Affiliation:
Jet Propulsion Laboratory/Caltech, Pasadena, CA, U.S.A.
J.T. Gathright
Affiliation:
University of Hawaii at Hilo, HI, U.S.A.
G.J. Odgers
Affiliation:
Dominion Astrophysical Observatory, Victoria, BC, Canada

Abstract

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We have obtained Voyager Ultraviolet Spectrometer (UVS) measurements of well-known β Cephei stars, which now total more than 1500 hours (> 300 pulsation cycles!) and which constitute the most comprehensive coherent data set that can address fundamental pulsation properties of a significant cross-section of the group. The extended measurement sequences for individual stars, which cover many successive pulsation cycles at wavelengths where pulsation amplitudes reach a maximum, can provide more comprehensive tests of pulsation stability than any ground-based data. During 1990-91, we acquired more than 100 hours of ground-based high-resolution spectroscopic observations and UBV photometric observations, simultaneous and near-simultaneous with the UVS data set. Analysis has been initiated at NASA's Goddard Spaceflight Center (NASA/GSFC), the University of Hawaii at Hilo (UH Hilo), and the Dominion Astrophysical Observatory (DAO).

Type
Beyond the Classical Instability Strip
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 184 - 185
Copyright
Copyright © Cambridge University Press 1993