期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 474, 期 4, 页码 5413-5424出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx3169
关键词
stars: interiors; stars: oscillations; stars: solar-type
资金
- NASA's Science Mission Directorate
- European Community Programme ([FP7]) [FP7SPACE2012-312844]
- Fundacao para a Ciencia e a Tecnologia (FCT) through national funds [UID/FIS/04434/2013]
- FEDER through COMPETE [POCI-01-0145-FEDER-007672]
- FCT [IF/00894/2012/CP0150/CT0004]
- ASTERISK project (ASTERoseismic Investigations with SONG and Kepler) - European Research Council [267864]
- Danish National Research Foundation [DNRF106]
- NSFC [11473053, 11233005, U1331201]
- Fundação para a Ciência e a Tecnologia [IF/00894/2012/CP0150/CT0004] Funding Source: FCT
Mixed modes have been extensively observed in post-main-sequence stars by the Kepler and CoRoT space missions. The mixture of the p and g modes can be measured by the dimensionless coefficient q, the so-called coupling strength factor. In this paper, we discuss the utility of the phase shifts theta from the eigenvalue condition for mixed modes as a tool to characterize dipolar mixed modes from the theoretical as well as the practical point of view. Unlike the coupling strength, whose variation in a given star is very small over the relevant frequency range, the phase shifts vary significantly for different modes. The analysis in terms of theta can also provide a better understanding of the pressure and gravity radial order for a given mixed mode. Observed frequencies of the Kepler red-giant star KIC 3744043 are used to test the method. The results are very promising.
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