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Title: The excitation of solar-like oscillations in a delta Sct star by efficient envelope convection
Authors: Antoci, V ×
Handler, G
Campante, T. L
Thygesen, A. O
Moya, A
Kallinger, Thomas
Stello, D
Grigahcene, A
Kjeldsen, H
Bedding, T. R
Lueftinger, T
Christensen-Dalsgaard, J
Catanzaro, G
Frasca, A
De Cat, P
Uytterhoeven, K
Bruntt, H
Houdek, G
Kurtz, D. W
Lenz, P
Kaiser, A
Van Cleve, J
Allen, C
Clarke, B. D #
Issue Date: Sep-2011
Publisher: Nature Publishing Group
Series Title: Nature vol:477 issue:7366 pages:570-573
Abstract: Delta Scuti (delta Sct)(1) stars are opacity-driven pulsators with masses of 1.5-2.5 M-circle dot, their pulsations resulting from the varying ionization of helium. In less massive stars(2) such as the Sun, convection transports mass and energy through the outer 30 per cent of the star and excites a rich spectrum of resonant acoustic modes. Based on the solar example, with no firm theoretical basis, models predict that the convective envelope in delta Sct stars extends only about 1 per cent of the radius(3), but with sufficient energy to excite solar-like oscillations(4,5). This was not observed before the Kepler mission(6), so the presence of a convective envelope in the models has been questioned. Here we report the detection of solar-like oscillations in the delta Sct star HD187547, implying that surface convection operates efficiently in stars about twice as massive as the Sun, as the ad hoc models predicted.
ISSN: 0028-0836
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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