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Does Extreme Mixing Improve Frequency Agreement for δ Scuti Stars?

Published online by Cambridge University Press:  12 April 2016

Joyce A. Guzik ,
Benjamin A. Austin ,
Paul A. Bradley  and
Arthur N. Cox
Joyce A. Guzik
Affiliation:
Los Alamos National Laboratory, X-2, MS T085, Los Alamos, NM 87545-2345, USA
Benjamin A. Austin
Affiliation:
Los Alamos National Laboratory, X-2, MS T085, Los Alamos, NM 87545-2345, USA
Paul A. Bradley
Affiliation:
Los Alamos National Laboratory, X-2, MS T085, Los Alamos, NM 87545-2345, USA
Arthur N. Cox
Affiliation:
Los Alamos National Laboratory, X-2, MS T085, Los Alamos, NM 87545-2345, USA

Abstract

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δ Scuti stars that have been observed intensely by the Delta Scuti Network and other campaigns exhibit fewer modes than predicted in the observed frequency range. In addition, some modes are difficult to match by the most likely observable l = 0, 1, and 2 modes, especially considering available spectroscopic mode identifications. Here we examine frequency predictions for stellar models for FG Vir and 4 CVn with extensive core mixing, well beyond the plausible limits of such mixing from convective core overshooting. We find that mixing has the potential to substantially improve frequency agreement, and deserves further investigation.

Type
Part 8. New theoretical developments in stellar pulsation and variability
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 462 - 465
Copyright
Copyright © Astronomical Society of the Pacific 2004

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