stars: AGB and post-AGB; stars: evolution; stars: fundamental parameters; stars: individual: KIC 4351319; stars: oscillations; stars: solar-type
Abstract :
[en] We present the results of the asteroseismic analysis of the red-giant star KIC 4351319 (TYC 3124-914-1), observed for 30 d in short-cadence mode with the Kepler satellite. The analysis has allowed us to determine the large and small frequency separations, ?Hz and ?Hz, respectively, and the frequency of maximum oscillation power, ?Hz. The high signal-to-noise ratio of the observations allowed us to identify 25 independent pulsation modes whose frequencies range approximately from 300 to ?Hz. The observed oscillation frequencies together with the accurate determination of the atmospheric parameters (effective temperature, gravity and metallicity), provided by additional ground-based spectroscopic observations, enabled us to theoretically interpret the observed oscillation spectrum. KIC 4351319 appears to oscillate with a well-defined solar-type p-mode pattern due to radial acoustic modes and non-radial nearly pure p modes. In addition, several non-radial mixed modes have been identified. Theoretical models well reproduce the observed oscillation frequencies and indicate that this star, located at the base of the ascending red-giant branch, is in the hydrogen-shell-burning phase, with a mass of ˜1.3 M[SUB]&sun;[/SUB], a radius of ? and an age of ˜5.6 Gyr. The main parameters of this star have been determined with an unprecedented level of precision for a red-giant star, with uncertainties of 2 per cent for mass, 7 per cent for age, 1 per cent for radius and 4 per cent for luminosity.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
di Mauro, M. P.; INAF - IASF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via del Fosso del Cavaliere 100, 00133 Roma, Italy
Cardini, D.; INAF - IASF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via del Fosso del Cavaliere 100, 00133 Roma, Italy
Catanzaro, G.; INAF - Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
Ventura, R.; INAF - Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
Barban, C.; LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France
Bedding, T. R.; Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Christensen-Dalsgaard, J.; Institut for Fysik og Astronomi, Bygn. 1520, Aarhus Universitet, Ny Munkegade, DK-8000 Aarhus C, Denmark
De Ridder, J.; Institut voor Sterrenkunde, K. U. Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
Hekker, S.; School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT ; Astronomical Institute 'Anton Pannekoek', University of Amsterdam, Science Park 904, 1098 XH Amsterdam, the Netherlands
Huber, D.; Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Kallinger, T.; Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada ; Institute of Astronomy, University of Vienna, 1180 Vienna, Austria
Miglio, Andrea ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Montalban Iglesias, Josefa ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Mosser, B.; LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France
Stello, D.; Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Uytterhoeven, K.; Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, CEA, IRFU, SAp, Centre de Saclay, 91191 Gif-sur-Yvette, France ; Kiepenheuer-Institut für Sonnenphysik, Schöneckstraße 6, 79104 Freiburg im Breisgau, Germany
Kinemuchi, K.; Bay Area Environmental Research Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
Kjeldsen, H.; Institut for Fysik og Astronomi, Bygn. 1520, Aarhus Universitet, Ny Munkegade, DK-8000 Aarhus C, Denmark
Mullally, F.; SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
Still, M.; Bay Area Environmental Research Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
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