The variability of the CoRoT target HD171834: gamma Dor pulsations and/or activity?
Autor: | 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. |
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Rok vydání: | 2011 |
Předmět: | |
Zdroj: | Astronomische Nachrichten, 331, No9-10, P48 (2010) |
Druh dokumentu: | Working Paper |
Popis: | 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. Comment: 4 pages, 4 figures, 1 table. Proceedings of the HELAS IV Conference, Lanzarote, February 2010 |
Databáze: | arXiv |
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