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

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

2007-08-15

arxiv.org/abs/0708.2010v1

Astronomy and Astrophysics

Astrophysics

14 pages, 16 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20078267

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.

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