ensemble asteroseimology of 16,000 kepler red giants · ensemble asteroseimology of 16,000 kepler...
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Ensemble Asteroseimology of 16,000 Kepler red giants
Jie Yu1,2, Tim Bedding1,2, Daniel Huber1,2,3,
Dennis Stello1,2,4, and Marc Hon4
1. University of Sydney. 2. Aarhus University. 3. University of Hawaii, 4. University of New South Wales.
Motivation1. Homogeneity: Largest sample
2. Precision: Full-length Kepler light curves
3. Measurements: , ,Amp, Width, Granulation
4. Output: Catalog of M, R, log g
2
“SYD Pipeline”: Observables
Sample selection
4misclassified as MSunclassified in KIC
misclassified as Subgiantsmajority
Long-cadence datasets16,136 oscillators
𝜈max cutoff: >5 𝛍Hz“SYD”pipeline + visual inspection!!
0 5 10. 15Quarters
Seismic parameter comparison with literatureComparison
6Hekker et al. 2011
Seismic parameter comparisonComparison
7Hekker et al. 2011
Seismic parameter comparisonComparison
Peaking bagging: Davies et al. in prep.
9
“Nike Diagram”
Red Clump
Secondary Clump
RGB
Huber et al. (2011). The correction factor f is determined using the method from Sharma et al. (2016)
Masses and radii determination
Where
Masses and radii are inferred with the scaling relations:
Teff, [Fe/H]: KIC, LAMOST, APOGEE, CFOP…
Mathur et al. (2017)
Evolutionary Phase Classification from literature
Seismically-inferred M, R, and log g
mass loss ?
uncertain scaling relations ?
Massive oscillator
HeB
Massive oscillator
[37.13, 40.77] [3.10, 3.60]
Characterisation of power excess: Amp, Width, Granulation
Evolution
16
Characterisation of power excess: Amp, Width, Granulation
oscillation amplitude
oscillation amplitude
power excess width
granulation amplitude
[Fe/H] influence on Amplitude[Fe/H]: Photometry + Spectroscopy
from Mathur et al. (2017)RGB only
Kjeldsen & Bedding (2008)Stello el al. (2011)
[Fe/H] influence on Amplitude
Mathur et al. (2017)[Fe/H]: photometry+spectroscopy
MedianStandard Deviation
Pinsonneault et al. (2014)
How accurate are KIC [Fe/H] values ?
Uncertainties
1. We provided a catalog of seismic masses, radii and logg for ~16,000 oscillating red giants.
2. Oscillation and granulation amplitudes have dependencies on mass and Metallicity.
3. Power-excess width is an increasing function of mass.
Summary
Yu et al in prep.