ensemble asteroseimology of 16,000 kepler red giants · ensemble asteroseimology of 16,000 kepler...

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.