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Frank Grundahl

Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission

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  • A. Miglio, Univ Birmingham, University of Birmingham, Sch Phys & Astron
  • ,
  • W. J. Chaplin, Aarhus Univ, Aarhus University, Dept Phys & Astron, Stellar Astrophys Ctr
  • ,
  • K. Brogaard
  • M. N. Lund
  • B. Mosser, Univ Paris Diderot, Centre National de la Recherche Scientifique (CNRS), University of Paris Diderot - Paris VII, Universite de recherche Paris Sciences et Lettres (ComUE), Pierre & Marie Curie University - Paris 6, PSL Research University Paris, Observatoire de Paris, Univ Paris 06, CNRS, LESIA,Observ Paris,PSL Res Univ
  • ,
  • G. R. Davies, Aarhus Univ, Aarhus University, Dept Phys & Astron, Stellar Astrophys Ctr
  • ,
  • R. Handberg
  • A. P. Milone, Australian Natl Univ, Australian National University, Mt Stromlo Observ, Res Sch Astron & Astrophys
  • ,
  • A. F. Marino, Australian Natl Univ, Australian National University, Mt Stromlo Observ, Res Sch Astron & Astrophys
  • ,
  • D. Bossini, Aarhus Univ, Aarhus University, Dept Phys & Astron, Stellar Astrophys Ctr
  • ,
  • Y. P. Elsworth, Aarhus Univ, Aarhus University, Dept Phys & Astron, Stellar Astrophys Ctr
  • ,
  • F. Grundahl
  • T. Arentoft
  • ,
  • L. R. Bedin, Osservatorio Astron Padova INAF, University of Padua
  • ,
  • T. L. Campante
  • ,
  • J. Jessen-Hansen
  • C. D. Jones, Aarhus Univ, Aarhus University, Dept Phys & Astron, Stellar Astrophys Ctr
  • ,
  • J. S. Kuszlewicz, Aarhus Univ, Aarhus University, Dept Phys & Astron, Stellar Astrophys Ctr
  • ,
  • L. Malavolta, Univ Padua, University of Padua, Dipartimento Fis & Astron Galileo Galilei
  • ,
  • V. Nascimbeni, Osservatorio Astron Padova INAF, University of Padua
  • ,
  • E. L. Sandquist, San Diego State Univ, California State University System, San Diego State University, Dept Astron

Asteroseismic constraints on K giants make it possible to infer radii, masses and ages of tens of thousands of field stars. Tests against independent estimates of these properties are however scarce, especially in themetal-poor regime. Here, we report the detection of solar-like oscillations in eight stars belonging to the red-giant branch (RGB) and red-horizontal branch (RHB) of the globular cluster M4. The detections were made in photometric observations from the K2 Mission during its Campaign 2. Making use of independent constraints on the distance, we estimate masses of the eight stars by utilizing different combinations of seismic and non-seismic inputs. When introducing a correction to the Delta nu. scaling relation as suggested by stellar models, for RGB stars we find excellent agreement with the expected masses from isochrone fitting, and with a distance modulus derived using independent methods. The offset with respect to independent masses is lower, or comparable with, the uncertainties on the average RGB mass (4-10 per cent, depending on the combination of constraints used). Our results lend confidence to asteroseismic masses in the metal-poor regime. We note that a larger sample will be needed to allow more stringent tests to be made of systematic uncertainties in all the observables (both seismic and non-seismic), and to explore the properties of RHB stars, and of different populations in the cluster.

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume461
Issue1
Pages (from-to)760-765
Number of pages6
ISSN0035-8711
DOIs
Publication statusPublished - 1 Sep 2016

    Research areas

  • stars: low-mass, stars: oscillations, globular clusters: individual: NGC 6121 (M4), GLOBULAR-CLUSTER M4, MULTIPLE STELLAR POPULATIONS, HUBBLE-SPACE-TELESCOPE, UV LEGACY SURVEY, NGC 6121 M4, RED GIANTS, KEPLER-MISSION, MAIN-SEQUENCE, GALACTIC ARCHAEOLOGY, STARS

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