A MULTI-SITE CAMPAIGN TO MEASURE SOLAR-LIKE OSCILLATIONS IN PROCYON. II. MODE FREQUENCIES

被引：83

作者：

Bedding, Timothy R. ^{[1
]}

Kjeldsen, Hans ^{[2
]}

Campante, Tiago L. ^{[2
,3
]}

Appourchaux, Thierry ^{[4
]}

Bonanno, Alfio ^{[5
]}

Chaplin, William J. ^{[6
]}

Garcia, Rafael A. ^{[7
]}

Martic, Milena ^{[8
]}

Mosser, Benoit ^{[9
]}

Butler, R. Paul ^{[10
]}

Bruntt, Hans ^{[11
]}

Kiss, Laszlo L. ^{[1
,12
]}

O'Toole, Simon J. ^{[13
]}

Kambe, Eiji ^{[14
]}

Ando, Hiroyasu ^{[15
]}

Izumiura, Hideyuki ^{[14
]}

Sato, Bun'ei ^{[16
]}

Hartmann, Michael ^{[17
]}

Hatzes, Artie ^{[17
]}

Barban, Caroline ^{[11
]}

Berthomieu, Gabrielle

Michel, Eric ^{[11
]}

Provost, Janine ^{[18
]}

Turck-Chieze, Sylvaine

Lebrun, Jean-Claude ^{[8
]}

Schmitt, Jerome ^{[19
]}

Bertaux, Jean-Loup ^{[8
]}

Benatti, Serena ^{[20
]}

Claudi, Riccardo U.

Cosentino, Rosario ^{[5
]}

Leccia, Silvio

Frandsen, Soren ^{[2
]}

Brogaard, Karsten ^{[2
]}

Glowienka, Lars ^{[2
]}

Grundahl, Frank ^{[2
]}

Stempels, Eric ^{[21
]}

Arentoft, Torben ^{[2
]}

Bazot, Michael ^{[2
]}

Christensen-Dalsgaard, Jorgen ^{[2
]}

Dall, Thomas H. ^{[22
]}

Karoff, Christoffer ^{[2
]}

Lundgreen-Nielsen, Jens ^{[2
]}

Carrier, Fabien ^{[23
]}

Eggenberger, Patrick ^{[24
]}

Sosnowska, Danuta ^{[25
]}

Wittenmyer, Robert A. ^{[26
,27
]}

Endl, Michael ^{[26
]}

Metcalfe, Travis S. ^{[28
]}

Hekker, Saskia ^{[6
,29
]}

Reffert, Sabine ^{[30
]}

机构：

[1] Univ Sydney, SIfA, Sch Phys, Sydney, NSW 2006, Australia

[2] Aarhus Univ, DASC, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[3] Univ Porto, Ctr Astrofis, P-4150762 Oporto, Portugal

[4] Univ Paris 11, Inst Astrophys Spatiale, CNRS, F-91405 Orsay, France

[5] Osserv Astrofis Catania, INAF, I-95123 Catania, Italy

[6] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[7] CEA, DAPNIA, DSM, Serv Astrophys, F-91191 Gif Sur Yvette, France

[8] Univ Versailles St Quentin, LATMOS, CNRS, F-91371 Verrieres Le Buisson, France

[9] Univ Paris 07, LESIA, CNRS, Observ Paris,Univ Paris 06, F-92195 Meudon, France

[10] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA

[11] Univ Paris Diderot, Lab AIM, CEA, DSM,CNRS,IRFU,SAp, F-91191 Gif Sur Yvette, France

[12] Hungarian Acad Sci, Konkoly Observ Budapest, H-1525 Budapest, Hungary

[13] Anglo Australian Observ, Epping, NSW 1710, Australia

[14] Natl Inst Nat Sci, Natl Astron Observ Japan, Okayama Astrophys Observ, Asakuchi, Okayama 7190232, Japan

[15] Natl Inst Nat Sci, Natl Astron Observ Japan, Tokyo 1818588, Japan

[16] Tokyo Inst Technol, Global Edge Inst, Meguro Ku, Tokyo 1528550, Japan

[17] Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany

[18] Univ Nice Sophia Antipolis, CNRS, UMR 6202, Lab Cassiopee,Observ Cote Azur, F-06304 Nice, France

[19] Observ Haute Provence, F-04870 St Michel lObservatoire, France

[20] Univ Padua, CISAS, I-35131 Padua, Italy

[21] Dept Phys & Astron, SE-75120 Uppsala, Sweden

[22] European So Observ, D-85748 Garching, Germany

[23] Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Leuven, Belgium

[24] Univ Geneva, Observ Geneva, CH-1290 Sauverny, Switzerland

[25] EPFL, Astrophys Lab, CH-1290 Observatoire, Versoix, Switzerland

[26] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA

[27] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[28] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA

[29] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[30] Heidelberg Univ, ZAH Landessternwarte, D-69117 Heidelberg, Germany

来源：

ASTROPHYSICAL JOURNAL | 2010年 / 713卷 / 02期

基金：

澳大利亚研究理事会; 瑞士国家科学基金会;

关键词：

stars: individual (Procyon A); stars: oscillations; P-MODES; STARS; GRANULATION; PHOTOMETRY; LIFETIMES; ROTATION; ASTEROSEISMOLOGY; INCLINATION; SEISMOLOGY; CONVECTION;

D O I：

10.1088/0004-637X/713/2/935

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have analyzed data from a multi-site campaign to observe oscillations in the F5 star Procyon. The data consist of high-precision velocities that we obtained over more than three weeks with 11 telescopes. A new method for adjusting the data weights allows us to suppress the sidelobes in the power spectrum. Stacking the power spectrum in a so-called echelle diagram reveals two clear ridges, which we identify with even and odd values of the angular degree (l = 0 and 2, and l = 1 and 3, respectively). We interpret a strong, narrow peak at 446 mu Hz that lies close to the l = 1 ridge as a mode with mixed character. We show that the frequencies of the ridge centroids and their separations are useful diagnostics for asteroseismology. In particular, variations in the large separation appear to indicate a glitch in the sound-speed profile at an acoustic depth of similar to 1000 s. We list frequencies for 55 modes extracted from the data spanning 20 radial orders, a range comparable to the best solar data, which will provide valuable constraints for theoretical models. A preliminary comparison with published models shows that the offset between observed and calculated frequencies for the radial modes is very different for Procyon than for the Sun and other cool stars. We find the mean lifetime of the modes in Procyon to be 1.29(-0.49)(+0.55) days, which is significantly shorter than the 2-4 days seen in the Sun.

引用

页码：935 / 949

页数：15

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