A simple method to measure numax for asteroseismology: application to 16,000 oscillating Kepler red giants
arxiv(2024)
摘要
The importance of numax (the frequency of maximum oscillation power) for
asteroseismology has been demonstrated widely in the previous decade,
especially for red giants. With the large amount of photometric data from
CoRoT, Kepler and TESS, several automated algorithms to retrieve numax values
have been introduced. Most of these algorithms correct the granulation
background in the power spectrum by fitting a model and subtracting it before
measuring numax. We have developed a method that does not require fitting to
the granulation background. Instead, we simply divide the power spectrum by a
function of the form nu^-2, to remove the slope due to granulation background,
and then smooth to measure numax. This method is fast, simple and avoids
degeneracies associated with fitting. The method is able to measure
oscillations in 99.9
systematic offset of 1.5
On comparing the seismic radii from this work with Gaia, we see similar trends
to those observed in previous studies. Additionally, our values of width of the
power envelope can clearly identify the dipole mode suppressed stars as a
distinct population, hence as a way to detect them. We also applied our method
to stars with low (0.19–18.35 muHz) and found it works well to correctly
identify the oscillations.
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