Solar-like oscillations in the G2 subgiant β hydri from dual-site observations

被引：87

作者：

Bedding, Timothy R.

Kjeldsen, Hans

Arentoft, Torben

Bouchy, Francois

Brandbyge, Jacob

Brewer, Brendon J.

Butler, R. Paul

Christensen-Dalsgaard, Jorgen

Dall, Thomas

Frandsen, Soren

Karoff, Christoffer

Kiss, Laszlo L.

Monteiro, Mario J. P. F. G.

Pijpers, Frank P.

Teixeira, Teresa C.

Tinney, C. G.

Baldry, Ivan K.

Carrier, Fabien

O'Toole, Simon J.

机构：

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

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

[3] Observ Geneva, CH-1290 Sauverny, Switzerland

[4] Astrophys Lab, F-13376 Marseille 12, France

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

[6] European So Observ, Santiago 19001 19, Chile

[7] Univ Porto, Fac Ciencias, P-4150762 Oporto, Portugal

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

[9] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BW, England

[10] Anglo Australian Observ, Epping, NSW 171001, Australia

[11] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England

[12] Katholieke Univ Leuven, Inst voor Sterrenkunde, B-3001 Heverlee, Belgium

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 663卷 / 02期

关键词：

stars : individual (beta Hydri); stars : oscillations;

D O I：

10.1086/518593

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have observed oscillations in the nearby G2 subgiant star beta Hyi using high-precision velocity observations obtained over more than a week with the HARPS and UCLES spectrographs. The oscillation frequencies show a regular comb structure, as expected for solar-like oscillations, but with several l = 1 modes being strongly affected by avoided crossings. These data, combined with those we obtained five years earlier, allow us to identify 28 oscillation modes. By scaling the large-frequency separation from the Sun, we measure the mean density of beta Hyi to an accuracy of 0.6%. The amplitudes of the oscillations are about 2.5 times solar and the mode lifetime is 2.3 days. A detailed comparison of the mixed l = 1 modes with theoretical models should allow a precise estimate of the age of the star.

引用

页码：1315 / 1324

页数：10

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