Estimating the p-mode frequencies of the solar twin 18 Scorpii

被引：23

作者：

Bazot, M. ^{[1
]}

Campante, T. L. ^{[1
]}

Chaplin, W. J. ^{[2
]}

Carfantan, H. ^{[3
]}

Bedding, T. R. ^{[4
]}

Dumusque, X. ^{[1
,5
]}

Broomhall, A-M ^{[2
]}

Petit, P. ^{[3
]}

Theado, S. ^{[3
]}

Van Grootel, V. ^{[3
]}

Arentoft, T. ^{[6
]}

Castro, M. ^{[7
]}

Christensen-Dalsgaard, J. ^{[8
]}

do Nascimento, J-D, Jr. ^{[7
]}

Dintrans, B. ^{[3
]}

Kjeldsen, H. ^{[8
]}

Monteiro, M. J. P. F. G. ^{[1
,9
]}

Santos, N. C. ^{[1
,9
]}

Sousa, S. ^{[1
]}

Vauclair, S. ^{[3
]}

机构：

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

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

[3] Univ Toulouse UPS OMP CNRS, Inst Rech Astrophys & Planetol, F-31400 Toulouse, France

[4] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

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

[6] VUC Aarhus, DK-8100 Aarhus C, Denmark

[7] Univ Fed Rio Grande do Norte, Depart Fis Teor & Expt, BR-59072970 Natal, RN, Brazil

[8] Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[9] Univ Porto, Fac Ciencias, Dept Fis & Astron, P-4150762 Oporto, Portugal

来源：

ASTRONOMY & ASTROPHYSICS | 2012年 / 544卷

基金：

英国科学技术设施理事会; 新加坡国家研究基金会; 欧洲研究理事会;

关键词：

stars: individual: 18 Sco; stars: oscillations; techniques: radial velocities; methods: data analysis; SUN-LIKE STARS; UNEQUALLY-SPACED DATA; TIME-SERIES ANALYSIS; ACOUSTIC-OSCILLATIONS; STELLAR OSCILLATION; FOURIER-ANALYSIS; MU ARAE; ASTEROSEISMOLOGY; GRANULATION; PARAMETERS;

D O I：

10.1051/0004-6361/201117963

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Solar twins have been a focus of attention for more than a decade, because their structure is extremely close to that of the Sun. Today, thanks to high-precision spectrometers, it is possible to use asteroseismology to probe their interiors. Our goal is to use time series obtained from the HARPS spectrometer to extract the oscillation frequencies of 18 Sco, the brightest solar twin. We used the tools of spectral analysis to estimate these quantities. We estimate 52 frequencies using an MCMC algorithm. After examination of their probability densities and comparison with results from direct MAP optimization, we obtain a minimal set of 21 reliable modes. The identification of each pulsation mode is straightforwardly accomplished by comparing to the well-established solar pulsation modes. We also derived some basic seismic indicators using these values. These results offer a good basis to start a detailed seismic analysis of 18 Sco using stellar models.

引用

页数：13

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