asteroseismology; stars: interiors; techniques: photometric; stars: evolution; stars: individual: HD 175272; stars: individual: HD 181420
Abstract :
[en] Context. The CoRoT short asteroseismic runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report the observation and modeling of the F5V star HD 175272. <BR /> Aims: Our aim is to define a method for extracting as much information as possible from a noisy oscillation spectrum. <BR /> Methods: We followed a differential approach that consists of using a well-known star as a reference to characterize another star. We used classical tools such as the envelope autocorrelation function to derive the global seismic parameters of the star. We compared HD 175272 with HD 181420 through a linear approach, because they appear to be asteroseismic twins. <BR /> Results: The comparison with the reference star enables us to substantially enhance the scientific output for HD 175272. First, we determined its global characteristics through a detailed seismic analysis of HD 181420. Second, with our differential approach, we measured the difference of mass, radius and age between HD 175272 and HD 181420. <BR /> Conclusions: We have developed a general method able to derive asteroseismic constraints on a star even in case of low-quality data. This method can be applied to stars with interesting properties but low signal-to-noise ratio oscillation spectrum, such as stars hosting an exoplanet or members of a binary system. The CoRoT space mission, launched on 2006 December 27, was developed and is operated by the CNES, with participation of the Science Programs of ESA, ESAs RSSD, Austria, Belgium, Brazil, Germany and Spain.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ozel, N.; Institut d'Astrophysique et de Géophysique de l'Université de Liège, Allée du 6 Août 17, 4000, Liège, Belgium ; Department of Astronomy and Space Science, Erciyes University, 38039 Melikgazi, Kayseri, Turkey
Mosser, B.; LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France
Dupret, Marc-Antoine ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Bruntt, H.; Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark
Barban, C.; LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France
Deheuvels, S.; Université de Toulouse, UPS-OMP, IRAP, 31400, Toulouse, France ; NRS, IRAP, 14 avenue Édouard Belin, 31400, Toulouse, France
García, R. A.; Laboratoire AIM, CEA/DSM, CNRS - Université Paris Diderot, , IRFU/SAp, 91191, Gif-sur-Yvette Cedex, France
Michel, Eric
Samadi, R.; LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France
Baudin, F.; Institut d'Astrophysique Spatiale, UMR 8617, Université Paris Sud, , 91405, Orsay Cedex, France
Mathur, S.; Space Science Institute, 4750 Walnut street Suite# 205, Boulder, CO, 80301, USA
Régulo, C.; Instituto de Astrofisica de Canarias, 38205, La Laguna, Tenerife, Spain ; Universidad de La Laguna, Dpto de Astrofisica, 38206, La Laguna, Tenerife, Spain
Auvergne, M.; LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France
Catala, C.; LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France
Morel, P.; Université de Nice-Sophia Antipolis, CNRS UMR 7293, Observatoire de la Côte d'Azur, Laboratoire J.L. Lagrange, BP 4229, 06304, Nice Cedex 04, France
Pichon, B.; Université de Nice-Sophia Antipolis, CNRS UMR 7293, Observatoire de la Côte d'Azur, Laboratoire J.L. Lagrange, BP 4229, 06304, Nice Cedex 04, France)
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