July 31, 2017 to August 3, 2017
Royal Observatory of Belgium
UTC timezone
<br>2nd LAMOST-Kepler workshop<br><br>LAMOST in the era of large spectroscopic surveys<P><img src="https://events.oma.be/indico/event/26/picture/0.jpg" width="466" height="50">

Investigating Oscillations in 16,000 Red Giants using Kepler and LAMOST

Aug 1, 2017, 10:40 AM
Meridian Room (Royal Observatory of Belgium)

Meridian Room

Royal Observatory of Belgium

Contributed talk 3.1 Science with the LAMOST 2.2 The LAMOST as a large spectroscopic survey


Mr Jie Yu (University of Sydney)


The Kepler mission has provided exquisite data to perform ensemble asteroseismic analysis on evolved stars. In this work we systematically characterize the oscillation power excess for 16,136 oscillating red giants, using full-length long-cadence data. We produced a homogeneous catalog of seismic masses, radii, and surface gravities and investigated the properties of the oscillation power excess as a function of seismic mass and metallicity provided by LAMOST. We find that low mass helium-core burning (HeB) stars show the same oscillation amplitude while higher mass HeB stars show lower amplitude compared to RGB stars. We also discovered that the power excess width is an increasing function of stellar mass. We furthermore provide the first evidence for a dependence of the oscillation amplitude and power excess width on metallicity, with metal-rich red giants having higher oscillation and background-granulation amplitudes and narrower excess width. Our asteroseismic stellar properties can be used as reliable distance indicators and age proxies for dating and mapping stellar populations observed by Kepler. It will also provide an excellent opportunity to test asteroseismology using Gaia parallaxes, and lift degeneracies in deriving atmospheric parameters in large spectroscopic surveys such as APOGEE and LAMOST.

Primary author

Mr Jie Yu (University of Sydney)


Dr Daniel Huber (University of Hawii) Dr Dennis Stello (University of New South Wales) Mr Marc Hon (University of new south wales) Prof. Timothy Bedding (University of Sydney)

Presentation materials