The amplitude of solar oscillations using stellar techniques

被引:115
作者
Kjeldsen, Hans [1 ]
Bedding, Timothy R. [2 ]
Arentoft, Torben [1 ]
Butler, R. Paul [3 ]
Dall, Thomas H. [4 ]
Karoff, Christoffer [1 ]
Kiss, Laszlo L. [2 ]
Tinney, C. G. [5 ]
Chaplin, William J. [6 ]
机构
[1] Univ Aarhus, DASC, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
[2] Univ Sydney, Sch Phys A28, Sydney, NSW 2006, Australia
[3] Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA
[4] Gemini Observ, Hilo, HI 96720 USA
[5] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
[6] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
关键词
Sun : helioseismology; stars : individual (alpha Centaurus A; alpha Centaurus B; alpha Fornax; beta Aquila; beta Hydrus; delta Pavo; gamma Serpens; nu Indus); stars : oscillations;
D O I
10.1086/589142
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The amplitudes of solar-like oscillations depend on the excitation and damping, both of which are controlled by convection. Comparing observations with theory should therefore improve our understanding of the underlying physics. However, theoretical models invariably compute oscillation amplitudes relative to the Sun, and it is therefore vital to have a good calibration of the solar amplitude using stellar techniques. We have used daytime spectra of the Sun, obtained with HARPS and UCLES, to measure the solar oscillations and made a detailed comparison with observations using the BiSON helioseismology instrument. We find that the mean solar amplitude measured using stellar techniques, averaged over one full solar cycle, is 18.7 +/- 0.7 cm s(-1) for the strongest radial modes (l = 0) and 25.2 +/- 0.9 cm s (1) for l = 1. In addition, we use simulations to establish an equation that estimates the uncertainty of amplitude measurements that are made of other stars, given that the mode lifetime is known. Finally, we also give amplitudes of solar-like oscillations for three stars that we measured from a series of short observations with HARPS (gamma Ser, beta Aql, and alpha For), together with revised amplitudes for five other stars for which we have previously published results (alpha Cen A, alpha Cen B, beta Hyi, nu Ind, and delta Pav).
引用
收藏
页码:1370 / 1375
页数:6
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