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Theoretical properties of regularities in the oscillation spectra of A-F main-sequence stars

Published online by Cambridge University Press:  18 February 2014

Juan Carlos Suárez ,
Antonio García Hernández ,
Andrés Moya ,
Carlos Rodrigo ,
Enrique Solano ,
Rafael Garrido  and
José R. Rodón
Juan Carlos Suárez
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC) CP3004, Granada, Spain. email: jcsuarez@iaa.es
Antonio García Hernández
Affiliation:
Centro de Astrofísica, Universidade do Porto Rua das Estrelas 4150-762, Porto, Portugal email: agh@astro.up.pt
Andrés Moya
Affiliation:
Dept. Astrofísica CAB (INTA-CSIC). ESAC CampusP.O. Box 78. 28691 Villanueva de la Cañada, Madrid, Spain email: amoya@cab.inta-csic.es, esm@cab.inta-csic.es, crb@cab.inta-csic.es
Carlos Rodrigo
Affiliation:
Dept. Astrofísica CAB (INTA-CSIC). ESAC CampusP.O. Box 78. 28691 Villanueva de la Cañada, Madrid, Spain email: amoya@cab.inta-csic.es, esm@cab.inta-csic.es, crb@cab.inta-csic.es Spanish Virtual Observatory
Enrique Solano
Affiliation:
Dept. Astrofísica CAB (INTA-CSIC). ESAC CampusP.O. Box 78. 28691 Villanueva de la Cañada, Madrid, Spain email: amoya@cab.inta-csic.es, esm@cab.inta-csic.es, crb@cab.inta-csic.es Spanish Virtual Observatory
Rafael Garrido
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC) CP3004, Granada, Spain. email: jcsuarez@iaa.es
José R. Rodón
Affiliation:
Instituto de Astrofísica de Andalucía (CSIC) CP3004, Granada, Spain. email: jcsuarez@iaa.es
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Abstract

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We study the theoretical properties of the regular spacings found in the oscillation spectra of δ Scuti stars. A linear relation between the large separation and the mean density is predicted to be found in the low-frequency domain (i.e. radial orders spanning from 1 to 8, approximately) of the main-sequence δ Scuti stars' oscillation spectrum. This implies an independent direct measure of the average density of δ Scuti stars, analogous to that of the Sun, and places tight constraints on the mode identification and hence on the stellar internal structure and dynamics, and allows a determination the radii of planets orbiting around δ Scuti stars with unprecedented precision. This opens the way for studying the evolution of regular patterns in pulsating stars, and its relation to stellar structure and evolution.

Keywords

stars: evolutionoscillations (including pulsations)stars: interiorsstars: variables: δ Scuti
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 89 - 92
Copyright
Copyright © International Astronomical Union 2014 

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