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Kepler observations of Am stars

Balona, L. A. ; Ripepi, V. ; Catanzaro, G. ; Kurtz, D. W. ; Smalley, B. ; De Cat, P. ; Eyer, L. ; Grigahcène, A. ; Leccia, S. ; Southworth, J. ; Uytterhoeven, K. ; Van Winckel, H. ; Christensen-Dalsgaard, J. ; Kjeldsen, H. ; Caldwell, D. A. ; Van Cleve, J. ; Girouard, F. R.

In: Monthly Notices of the Royal Astronomical Society, 2011, vol. 414, no. 1, p. 792-800

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    Titre
    • Kepler observations of Am stars
    Auteur
    • Balona, L. A.. South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa
    • Ripepi, V.. INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy
    • Catanzaro, G.. INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy
    • Kurtz, D. W.. Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire, Preston PR1 2HE
    • Smalley, B.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • De Cat, P.. Koninklijke Sterrenwacht van Belgie, Brussels, Belgium
    • Eyer, L.. Observatoire de Genéve, 51 ch. des Maillettes, CH-1290 Sauverny, Switzerland
    • Grigahcène, A.. Centro de Astrofisica, Faculdade de Ciências,, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
    • Leccia, S.. INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy
    • Southworth, J.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • Uytterhoeven, K.. Laboratoire AIM, CEA/DSM CNRS-Université Paris Diderot, Paris, France
    • Van Winckel, H.. Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200B, 3000 Leuven, Belgium
    • Christensen-Dalsgaard, J.. Department of Physics and Astronomy, Building 1520, Aarhus University, 8000 Aarhus C, Denmark
    • Kjeldsen, H.. Department of Physics and Astronomy, Building 1520, Aarhus University, 8000 Aarhus C, Denmark
    • Caldwell, D. A.. SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
    • Van Cleve, J.. SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
    • Girouard, F. R.. Orbital Sciences Corporation/NASA Ames Research Center, Moffett Field, CA 94035, USA
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2011, vol. 414, no. 1, p. 792-800. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:290618
    Summary
    We present an analysis of high-resolution spectra for two pulsating Am stars in the Kepler field. The stellar parameters derived in this way are important because parameters derived from narrow-band photometry may be affected by the strong metal lines in these stars. We analyse the Kepler time series of ten known Am stars and find that six of them clearly show δ Scuti pulsations. The other four appear to be non-pulsating. We derive fundamental parameters for all known pulsating Am stars from ground-based observations and also for the Kepler Am stars to investigate the location of the instability strip for pulsating Am stars. We find that there is not much difference between the Am-star instability strip and the δ Scuti instability strip. We find that the observed location of pulsating Am stars in the HR diagram does not agree with the location predicted from diffusion calculations