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

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/745/2/L33· OSTI ID:22048066

Benomar, O; Bedding, T R; Stello, D; White, T R ^[1]; Deheuvels, S ^[2]; Christensen-Dalsgaard, J ^[3]

---

1. Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006 (Australia)
2. Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States)
3. Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)

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 Sun }. 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.

• OSTI ID: 22048066
• Journal Information: Astrophysical Journal Letters, Vol. 745, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACCURACY
COUPLING
DATA ANALYSIS
EVALUATION
MASS
OSCILLATIONS
PROBES
SEISMOLOGY
STAR MODELS
STARS