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Title:
The variability of the CoRoT target HD171834: gamma Dor pulsations and/or activity?
Authors:
Uytterhoeven, K.; Mathias, P.; Baglin, A.; Rainer, M.; Poretti, E.; Amado, P.; Chapellier, E.; Mantegazza, L.; Pollard, K.; Suarez, J. C.; Kilmartin, P. M.; Sato, K. H.; Garcia, R. A.; Auvergne, M.; Michel, E.; Samadi, R.; Catala, C.; Baudin, F.
Publication:
eprint arXiv:1111.1840
Publication Date:
11/2011
Origin:
ARXIV
Keywords:
Astrophysics - Solar and Stellar Astrophysics
Comment:
4 pages, 4 figures, 1 table. Proceedings of the HELAS IV Conference, Lanzarote, February 2010; Astronomische Nachrichten, 331, No9-10, P48 (2010)
Bibliographic Code:
2011arXiv1111.1840U

Abstract

We present the preliminary results of a frequency and line-profile analysis of the CoRoT gamma Dor candidate HD171834. The data consist of 149 days of CoRoT light curves and a ground-based dataset of more than 1400 high-resolution spectra, obtained with six different instruments. Low-amplitude frequencies between 0 and 5 c/d, dominated by a frequency near 0.96 c/d and several of its harmonics, are detected. These findings suggest that HD171834 is not a mere gamma Dor pulsator and that stellar activity plays an important role in its variable behaviour. Based on CoRoT space data and on ground-based observations with ESO Telescopes at the La Silla Observatory under the ESO Large Programmes ESO LP 178.D-0361 and ESO LP 182.D-0356 (FEROS/2.2m and HARPS/3.6m), and data collected with FOCES/2.2m at the Centro Astronomico Hispano Aleman at Calar Alto, SOPHIE/1.93m at Observatoire de Haute Provence, FIES/NOT at Observatorio del Roque de los Muchachos, and HERCULES/1.0m at Mount John University Observatory.
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