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

被引:50
作者
Antoci, V. [1 ]
Handler, G. [1 ,2 ]
Campante, T. L. [3 ,4 ]
Thygesen, A. O. [5 ]
Moya, A. [6 ]
Kallinger, T. [1 ,7 ,8 ]
Stello, D. [9 ]
Grigahcene, A. [3 ]
Kjeldsen, H. [4 ]
Bedding, T. R. [9 ]
Lueftinger, T. [1 ]
Christensen-Dalsgaard, J. [4 ]
Catanzaro, G. [10 ]
Frasca, A. [10 ]
De Cat, P. [11 ]
Uytterhoeven, K. [12 ,13 ,14 ,15 ]
Bruntt, H. [4 ]
Houdek, G. [1 ]
Kurtz, D. W. [16 ]
Lenz, P. [2 ]
Kaiser, A. [1 ]
Van Cleve, J. [17 ]
Allen, C. [18 ]
Clarke, B. D. [17 ]
机构
[1] Univ Vienna, Inst Astron, A-1180 Vienna, Austria
[2] Copernicus Astron Ctr, PL-00716 Warsaw, Poland
[3] Univ Porto, Dept Fis Astron, Ctr Astrofis, Fac Ciencias, P-4150762 Oporto, Portugal
[4] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
[5] Nord Opt Telescope, E-38700 Santa Cruz De La Palma, Santa Cruz De T, Spain
[6] CSIC, Dept Astrofis, Ctr Astrobiol, Inst Nacl Tecn Aeroesp, E-28691 Madrid, Spain
[7] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[8] Univ Leuven, Inst Sterrenkunde, B-3001 Louvain, Belgium
[9] Univ Sydney, Sydney Inst Astron SIfA, Sch Phys, Sydney, NSW 2006, Australia
[10] Osserv Astrofis Catania, Ist Nazl Astrofis, I-95123 Catania, Italy
[11] Royal Observ Belgium, B-1180 Brussels, Belgium
[12] Univ Paris Diderot, Ctr Etud Saclay, Inst Rech Lois Fondament,Commissariat Energia Ato, Serv Astrophys,CEA DSM CNRS,Lab AIM, F-79104 Gif Sur Yvette, France
[13] Kiepenheuer Inst Sonnenphys, D-79104 Freiburg, Germany
[14] Inst Astrofis Canarias, Tenerife 38200, Spain
[15] Univ La Laguna, Dept Astrofis, Tenerife 38205, Spain
[16] Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England
[17] NASA, Ames Res Ctr, SETI Inst, Moffett Field, CA 94035 USA
[18] NASA, Ames Res Ctr, Orbital Sci Corp, Moffett Field, CA 94035 USA
基金
澳大利亚研究理事会;
关键词
MAIN-SEQUENCE; STELLAR OSCILLATIONS; SCUTI; AM; GRANULATION; AMPLITUDES; FIELDS;
D O I
10.1038/nature10389
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
收藏
页码:570 / 573
页数:4
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