Using the phase shift to asymptotically characterize the dipolar mixed modes in post-main-sequence stars

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Jiang, C (Author) Other; Christensen Dalsgaard, J (Author) Other; Cunha, MS (Author) FCUP

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 474

Pages: 5413-5424

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 2 Citations

Other information

Authenticus ID: P-00N-MJ1

DOI: 10.1093/mnras/stx3169

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12