Bibcode
Barceló-Forteza, S.; Roca-Cortés, T.; García Hernández, A.; García, R. A.
Bibliographical reference
Astronomy and Astrophysics, Volume 601, id.A57, 14 pp.
Advertised on:
5
2017
Journal
Citations
16
Refereed citations
14
Description
Context. Since CoRoT observations unveiled the very low amplitude modes
that form a flat plateau in the power spectrum structure of δ
Scuti stars, the nature of this phenomenon, including the possibility of
spurious signals due to the light curve analysis, has been a matter of
long-standing scientific debate. Aims: We contribute to this
debate by finding the structural parameters of a sample of four δ
Scuti stars, CID 546, CID 3619, CID 8669, and KIC 5892969, and looking
for a possible relation between these stars' structural parameters and
their power spectrum structure. Methods: For the purposes of
characterization, we developed a method of studying and analysing the
power spectrum with high precision and have applied it to both CoRoT and
Kepler light curves. Results: We obtain the best estimates to
date of these stars' structural parameters. Moreover, we observe that
the power spectrum structure depends on the inclination, oblateness, and
convective efficiency of each star. Conclusions: Our results
suggest that the power spectrum structure is real and is possibly formed
by 2-period island modes and chaotic modes.
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Savita
Mathur