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On The Seismic Signature of the HeII Ionization Zone in Stellar Envelopes

Published online by Cambridge University Press:  08 February 2017

Mário J.P.F.G. Monteiro  and
Michael J. Thompson
Mário J.P.F.G. Monteiro
Affiliation:
DMA-FCUP and CAUP, Universidade do Porto, Portugal
Michael J. Thompson
Affiliation:
Astronomy Unit, QMW, University of London, England

Extract

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Sharp variations of the structure of the star create a characteristic signal in its frequencies of oscillation (e.g. [3]). The zone of the second ionization of helium is such a localized feature of the structure whose properties depend mainly on the abundance of helium and the equation of state. Considering that such a signal should easily be detectable provided the frequencies are measured to rather better than 1μHz accuracy (the COROT project should measure oscillation frequencies with an accuracy of 0.1μHz), we present here a tool to study this aspect of stellar structure.

Type
V. Asteroseismology I
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 317 - 318
Copyright
Copyright © Kluwer 1998 

References

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