Research

Stars Group

Chemical Abundances

Compact Objects

Cool Stars

Galactic Structure

Space Astrometry

Stellar Clusters

Stellar Pulsation

Whole Earth Telescope

Stars Group : Whole Earth Telescope

Whole Earth Telescope

Mike Montgomery, Edward Nather, Don Winget


ADS | astro-ph

Mike Montgomery  

Research Scientist

website

Research Interests

Pulsation and seismology of white dwarf stars, nonlinear light curve modeling, numerical and theoretical studies of convection, evolution of white dwarf stars, constitutive physics of white dwarfs (crystallization, diffusion), Science Director of Whole Earth Telescope.

Group Areas

Stars, Compact Objects, Stellar Pulsation, Whole Earth Telescope, Theory, Asteroseismology, White Dwarfs


ADS | astro-ph

Edward Nather  

Professor Emeritus

website

Research Interests

Observational studies of interacting binary collapsed stars; asteroseismology of white dwarfs; the Whole Earth Telescope.

Group Areas

Stars, Whole Earth Telescope


ADS | astro-ph

Don Winget  

Professor

website

Research Interests

Theory and observation: cosmochronology; evolution of the Milky Way; late stages of stellar evolution; stellar pulsations; white dwarf stars as dark matter detectors; the Whole Earth Telescope.

Group Areas

Stars, Compact Objects, Stellar Pulsation, Whole Earth Telescope, Theory, Asteroseismology, White Dwarfs



The DFT of the xcov15 light curve after prewhitening (see text) by the 10 periodicities with the highest amplitudes: these frequencies are indicated by the downward (red) arrows. The vertical axes use the same units as in plot 2 and the horizontal dashed lines at 0.54 mma in the plots correspond to the 0.001 false alarm probability detection threshhold established by the Monte Carlo data-shuffling method discussed in the text. Using this value we can assert that there is real power at ∼ 4800 μHz (f9), but not at the frequency just below 4000 μHz marked a. The vertical (green) lines in the lower panel, annotated with the letters b - h, correspond to the predicted positions of combination frequencies where there are indications of real power in the DFT (see Table 3). The detected frequencies labelled f15 and f16 having amplitudes just above the significance threshhold also correspond to the predicted values of combination frequencies.

see

Whole Earth Telescope observations of the hot helium atmosphere pulsating white dwarf EC 20058-5234 astro-ph