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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The Kepler characterization of the variability among A-and F-type stars: I. General overview
Astronomy and Astrophysics, Volume 534, Article A125, Year 2011
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Description
Context. The Kepler spacecraft is providing time series of photometric data with micromagnitude precision for hundreds of A-F type stars. Aims. We present a first general characterization of the pulsational behaviour of A-F type stars as observed in the Kepler light curves of a sample of 750 candidate A-F type stars, and observationally investigate the relation between γ Doradus (γ Dor), δ Scuti (δ Sct), and hybrid stars. Methods. We compile a database of physical parameters for the sample stars from the literature and new ground-based observations. We analyse the Kepler light curve of each star and extract the pulsational frequencies using different frequency analysis methods. We construct two new observables, "energy" and "efficiency", related to the driving energy of the pulsation mode and the convective efficiency of the outer convective zone, respectively. Results. We propose three main groups to describe the observed variety in pulsating A-F type stars: γ Dor, δ Sct, and hybrid stars. We assign 63% of our sample to one of the three groups, and identify the remaining part as rotationally modulated/active stars, binaries, stars of different spectral type, or stars that show no clear periodic variability. 23% of the stars (171 stars) are hybrid stars, which is a much higher fraction than what has been observed before. We characterize for the first time a large number of A-F type stars (475 stars) in terms of number of detected frequencies, frequency range, and typical pulsation amplitudes. The majority of hybrid stars show frequencies with all kinds of periodicities within the γ Dor and δ Sct range, also between 5 and 10 d-1, which is a challenge for the current models. We find indications for the existence of δ Sct and γ Dor stars beyond the edges of the current observational instability strips. The hybrid stars occupy the entire region within the δ Sct and γ Dor instability strips and beyond. Non-variable stars seem to exist within the instability strips. The location of γ Dor and δ Sct classes in the (T eff, log g)-diagram has been extended. We investigate two newly constructed variables, "efficiency" and "energy", as a means to explore the relation between γ Dor and δ Sct stars. Conclusions. Our results suggest a revision of the current observational instability strips of δ Sct and γ Dor stars and imply an investigation of pulsation mechanisms to supplement the κ mechanism and convective blocking effect to drive hybrid pulsations. Accurate physical parameters for all stars are needed to confirm these findings. © 2011 ESO.
Authors & Co-Authors
Uytterhoeven, Katrienu
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
France, Gif-sur-yvette
Institut de Recherche Sur Les Lois Fondamentales de L'univers
Moya, A.
Germany, Freiburg Im Breisgau
Leibniz-institut Für Sonnenphysik
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Grigahcène, Ahmed
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Guzik, Joyce Ann
Spain, Torrejon de Ardoz
Centro de Astrobiología Csic-inta
Gutiérrez-Soto, Juan
Portugal, Porto
Universidade do Porto
United States, Los Alamos
Los Alamos National Laboratory
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Smalley, Barry S.
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Handler, Gerald
Spain, Valencia
Valentian International University
United Kingdom, Keele
Keele University
Balona, Luis A.
Austria, Vienna
Institut Für Astrophysik
Niemczura, Ewa
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Fox-Machado, Lester
South Africa, Cape Town
South African Astronomical Observatory
Benatti, Serena
Poland, Wroclaw
University of Wroclaw
Mexico, Ensenada
Instituto de Astronoma Sede Ensenada
Chapellier, Eric
Italy, Padua
Università Degli Studi Di Padova
Tkachenko, Andrew
Italy, Padua
Osservatorio Astronomico Di Padova
Szabó, Róbert
France, Nice
Laboratoire Joseph-louis Lagrange
Suárez, J. C.
Portugal, Porto
Universidade do Porto
Ripepi, Vincenzo
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Pascual-Granado, J.
Portugal, Porto
Universidade do Porto
Mathias, Philippe
Hungary, Budapest
Magyar Tudomanyos Akademia
Martín-Ruiz, Susana
Portugal, Porto
Universidade do Porto
Lehmann, Holger
Italy, Naples
Osservatorio Astronomico Di Capodimonte
Jackiewicz, Jason A.
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
Hekker, Saskia
Germany, Camburg
Thüringen Landessternwarte Tautenburg
United States, Las Cruces
New Mexico State University
Gruberbauer, Michael
Spain, Valencia
Valentian International University
Netherlands, Amsterdam
Anton Pannekoek Instituut Voor Sterrenkunde
García, Raphael A.
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Dumusque, Xavier
Spain, San Cristobal de la Laguna
Universidad de la Laguna
United Kingdom, Birmingham
University of Birmingham
Díaz-Fraile, D.
Portugal, Porto
Universidade do Porto
Bradley, Paul A.
Canada, Halifax
Saint Mary's University
Antoci, Victoria L.
Spain, Valencia
Valentian International University
Roth, Markus
France, Gif-sur-yvette
Institut de Recherche Sur Les Lois Fondamentales de L'univers
Leroy, B.
United States, Los Alamos
Los Alamos National Laboratory
Murphy, Simon J.
Switzerland, Geneva
Université de Genève
de Cat, Peter
United States, Los Alamos
Los Alamos National Laboratory
Cuypers, Jan
United States, Los Alamos
Los Alamos National Laboratory
Kjeldsen, Henrik
United Kingdom, Preston
University of Central Lancashire
Christensen-Dalsgaard, Joergen
United Kingdom, Preston
University of Central Lancashire
Breger, Michael
Spain, Valencia
Valentian International University
Belgium, Brussels
Royal Observatory of Belgium
Pigulski, Andrzej
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Kiss, László L.
France, Nice
Laboratoire Joseph-louis Lagrange
Denmark, Aarhus
Aarhus Universitet
Still, Martin D.
United States, Austin
The University of Texas at Austin
Thompson, Susan E.
Australia, Sydney
The University of Sydney
United States, Moffett Field
Nasa Ames Research Center
van Cleve, Jeffrey E.
Australia, Sydney
The University of Sydney
Statistics
Citations: 247
Authors: 41
Affiliations: 36
Identifiers
Doi:
10.1051/0004-6361/201117368
ISSN:
00046361
e-ISSN:
14320746