A search for solar-like oscillations in K giants in the globular cluster M4

Abstract

To expand the range in the colour-magnitude diagram where asteroseismology can be applied, we organized a photometry campaign to find evidence for solar-like oscillations in giant stars in the globular cluster M4. The aim was to detect the comb-like p-mode structure characteristic for solar-like oscillations in the amplitude spectra. The two dozen main target stars are in the region of the bump stars and have luminosities in the range 50-140 Lsun. We collected 6160 CCD frames and light curves for about 14000 stars were extracted. We obtain high quality light curves for the K giants, but no clear oscillation signal is detected. High precision differential photometry is possible even in very crowded regions like the core of M4. Solar-like oscillations are probably present in K giants, but the amplitudes are lower than classical scaling laws predict.

arXiv comment14 pages, 16 figures, accepted for publication in A&A

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Cited by in corpus (14)

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• Integrated Mass Loss of Evolved Stars in M4 using Asteroseismology
• Photometric Oscillations of Low Luminosity Red Giant Stars
• Asteroseismology of the multiple stellar populations in the Globular Cluster M4
• Solar-like oscillations in a metal-poor globular cluster with the HST
• New asteroseismic scaling relations based on Hayashi track relation applied to red-giant branch stars in NGC 6791 and NGC 6819
• Atmospheric parameters of red giants in the Kepler field
• The effects of stellar population synthesis on the distributions of the asteroseismic observables ν_max and Δν of red-clump stars
• Solar-like oscillations in cluster stars
• The signature of granulation in a solar power spectrum as seen with CO${}^5$BOLD
• Characteristics of solar-like oscillations of clusters simulated by stellar population synthesis
• Inferring the efficiency of convective-envelope overshooting in Red Giant Branch stars