The excitation of solar-like oscillations in a delta Sct star by efficient envelope convection

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Antoci, V (Author) Other; Handler, G (Author) Other; Campante, TL (Author) Other; Thygesen, AO (Author) Other; Moya, A (Author) Other; Kallinger, T (Author) Other; Stello, D (Author) Other; Grigahcene, A (Author) Other; Kjeldsen, H (Author) Other; Bedding, TR (Author) Other; Lueftinger, T (Author) Other; Christensen Dalsgaard, J (Author) Other; Catanzaro, G (Author) Other; Frasca, A (Author) Other; De Cat, P (Author) Other; Uytterhoeven, K (Author) Other; Bruntt, H (Author) Other; Houdek, G (Author) Other; Kurtz, DW (Author) Other; Lenz, P (Author) Other; Kaiser, A (Author) Other; Van Cleve, J (Author) Other; Allen, C (Author) Other; Clarke, BD (Author) Other

Journal

Title: Nature

Vol. 477

Pages: 570-573

ISSN: 0028-0836

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 42 Citations

Scopus - 26 Citations

Other information

Authenticus ID: P-002-MF8

DOI: 10.1038/nature10389

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4