MASSES OF SUBGIANT STARS FROM ASTEROSEISMOLOGY USING THE COUPLING STRENGTHS OF MIXED MODES

For a few decades now, asteroseismology, the study of stellar oscillations, has enabled us to probe the interiors of stars with great precision. It allows stringent tests of stellar models and can provide accurate radii, masses, and ages for individual stars. Of particular interest are the mixed mod...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2012-02, Vol.745 (2), p.1-5
Main Authors: BENOMAR, O, Bedding, T R, STELLO, D, Deheuvels, S, White, T R, Christensen-Dalsgaard, J
Format: Article
Language:English
Subjects:
ACCURACY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COUPLING
DATA ANALYSIS
EVALUATION
Joining
MASS
Metallicity
OSCILLATIONS
PROBES
SEISMOLOGY
STAR MODELS
STARS
Stellar age
Stellar mass
Stellar models
Stellar oscillations
Strength
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Summary:For a few decades now, asteroseismology, the study of stellar oscillations, has enabled us to probe the interiors of stars with great precision. It allows stringent tests of stellar models and can provide accurate radii, masses, and ages for individual stars. Of particular interest are the mixed modes that occur in subgiant solar-like stars since they can place very strong constraints on stellar ages. Here, we measure the characteristics of the mixed modes, particularly the coupling strength, using a grid of stellar models for stars with masses between 0.9 and 1.5 M sub([middot in circle]). We show that the coupling strength of the l = 1 mixed modes is predominantly a function of stellar mass and appears to be independent of metallicity. This should allow an accurate mass evaluation, further increasing the usefulness of mixed modes in subgiants as asteroseismic tools.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/745/2/L33