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

Benomar, O; Bedding, T R; Stello, D; White, T R; Deheuvels, S; Christensen-Dalsgaard, J

doi:10.1088/2041-8205/745/2/L33

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

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Abstract

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.

Authors:

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

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

Publication Date:: Wed Feb 15 00:00:00 EST 2012

OSTI Identifier:: 22048066

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal Letters

Additional Journal Information:: Journal Volume: 745; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205

Country of Publication:: United States

Language:: English

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

Citation Formats


                    Benomar, O, Bedding, T R, Stello, D, White, T R, Deheuvels, S, and Christensen-Dalsgaard, J. MASSES OF SUBGIANT STARS FROM ASTEROSEISMOLOGY USING THE COUPLING STRENGTHS OF MIXED MODES.  United States: N. p., 2012. 
        Web.  doi:10.1088/2041-8205/745/2/L33.

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                    Benomar, O, Bedding, T R, Stello, D, White, T R, Deheuvels, S, & Christensen-Dalsgaard, J. MASSES OF SUBGIANT STARS FROM ASTEROSEISMOLOGY USING THE COUPLING STRENGTHS OF MIXED MODES.  United States.  https://doi.org/10.1088/2041-8205/745/2/L33

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                    Benomar, O, Bedding, T R, Stello, D, White, T R, Deheuvels, S, and Christensen-Dalsgaard, J. 2012.  
        "MASSES OF SUBGIANT STARS FROM ASTEROSEISMOLOGY USING THE COUPLING STRENGTHS OF MIXED MODES".  United States.  https://doi.org/10.1088/2041-8205/745/2/L33.

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@article{osti_22048066,

  title        = {MASSES OF SUBGIANT STARS FROM ASTEROSEISMOLOGY USING THE COUPLING STRENGTHS OF MIXED MODES},

  author       = {Benomar, O and Bedding, T R and Stello, D and White, T R and Deheuvels, S and Christensen-Dalsgaard, J},

  abstractNote = {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.},

  doi          = {10.1088/2041-8205/745/2/L33},

  url          = {https://www.osti.gov/biblio/22048066},
  journal      = {Astrophysical Journal Letters},

  issn         = {2041-8205},

  number       = 2,

  volume       = 745,

  place        = {United States},

  year         = {Wed Feb 15 00:00:00 EST 2012},

  month        = {Wed Feb 15 00:00:00 EST 2012}

}

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