The γ Doradus CoRoT target HD49434: II. Frequency analysis of the CoRoT data

E. Chapellier, E. Rodríguez, M. Auvergne, K. Uytterhoeven, P. Mathias, M. P. Bouabid, E. Poretti, D. Le Contel, S. Martín-Ruíz, P. J. Amado, R. Garrido, M. Hareter, M. Rainer, L. Eyer, M. Paparo, D. Díaz-Fraile, A. Baglin, F. Baudin, C. Catala, E. MichelR. Samadi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Context. HD49434 is a bright (V = 5m. 75) and multiperiodic γ Dor-type pulsator that has been selected for the asteroseismic core programme of the CoRoT satellite. Aims. An extensive and detailed study has been carried out to investigate the pulsational content of this object on the basis of the 136.9 d (331291 useful datapoints) time series collected by the CoRoT satellite during the long-run LRa01 (October 2007-March 2008). Methods. The frequency analysis was carried out using the recently available software package SigSpec and Period04. Results. The results confirm HD49434 as a complex pulsator with a very dense pulsation spectrum. A total of 1686 significant peaks are formally detected, essentially in the region below 15 d-1. No significant pulsation peaks are detected for frequencies higher than 30 d-1. Solar-type oscillations are not detected in this star. The reliability of such a high number of detected peaks has been investigated on the basis of two independent methods. As a result, we propose a total of 840 frequencies that can be assumed to be intrinsic to the star. Conclusions. The CoRoT mission provides very high-quality light curves and datasets, which are excellent for asteroseismic studies of complex pulsating stars beacause they allow investigation of the frequency content down to amplitude levels of a few μmag, unattainable with ground-based observations. In this way, hundreds of excited modes were detected in HD49434. This is the first time that so many frequencies have been found in a γ Dor-type pulsator.

Original languageEnglish
Article numberA23
JournalAstronomy and Astrophysics
Volume525
DOIs
Publication statusPublished - Jan 2011

Keywords

  • Stars: individual: HD49434
  • Stars: oscillations - techniques: photometric
  • Stars: variables: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Chapellier, E., Rodríguez, E., Auvergne, M., Uytterhoeven, K., Mathias, P., Bouabid, M. P., Poretti, E., Le Contel, D., Martín-Ruíz, S., Amado, P. J., Garrido, R., Hareter, M., Rainer, M., Eyer, L., Paparo, M., Díaz-Fraile, D., Baglin, A., Baudin, F., Catala, C., ... Samadi, R. (2011). The γ Doradus CoRoT target HD49434: II. Frequency analysis of the CoRoT data. Astronomy and Astrophysics, 525, [A23]. https://doi.org/10.1051/0004-6361/201014207