Ensemble Asteroseimology of 16,000 Kepler red giants Jie Yu 1,2 , - PowerPoint PPT Presentation

Ensemble Asteroseimology of 16,000 Kepler red giants Jie Yu 1,2 , Tim Bedding 1,2 , Daniel Huber 1,2,3 , Dennis Stello 1,2,4 , and Marc Hon 4 1 . University of Sydney. 2. Aarhus University. 3. University of Hawaii, 4. University of New South Wales.

Motivation 1. 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 misclassified as Subgiants majority unclassified in KIC misclassified as MS 4

Long-cadence datasets 16,136 oscillators 𝜉 max cutoff: >5 𝛎 Hz “SYD”pipeline + visual inspection!! 0 5 10. 15 Quarters

Seismic parameter comparison with literature Comparison Hekker et al. 2011 6

Seismic parameter comparison Comparison Hekker et al. 2011 7

Seismic parameter comparison Comparison Peaking bagging: Davies et al. in prep.

“Nike Diagram” Secondary Clump RGB Red Clump 9

Masses and radii determination Masses and radii are inferred with the scaling relations: Where Huber et al. (2011). The correction factor f is determined using the method from Sharma et al. (2016) T eff , [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 [3.10, 3.60] [37.13, 40.77]

Characterisation of power excess: Amp, Width, Granulation Evolution

Characterisation of power excess: Amp, Width, Granulation oscillation amplitude oscillation amplitude granulation amplitude power excess width 16

[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 [Fe/H]: photometry+spectroscopy Mathur et al. (2017) Median Standard Deviation

How accurate are KIC [Fe/H] values ? Pinsonneault et al. (2014)

Uncertainties

Summary 1. We provided a catalog of seismic masses, radii and log g 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. Yu et al in prep.