Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-11
Monthly Not. R. Astron. Soc., 314, 220 (2000)
Astronomy and Astrophysics
Astrophysics
10 pages, 9 figures, mn.sty. Accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03307.x
We have used time-resolved spectroscopy to measure the colour dependence of pulsation amplitudes in the DAV white dwarf G 29-38. Model atmospheres predict that mode amplitudes should change with wavelength in a manner that depends on the spherical harmonic degree l of the mode. This dependence arises from the convolution of mode geometry with wavelength-dependent limb darkening. Our analysis of the six largest normal modes detected in Keck observations of G 29-38 reveals one mode with a colour dependence different from the other five, permitting us to identify the l value of all six modes and to test the model predictions. The Keck observations also show pulsation amplitudes that are unexpectedly asymmetric within absorption lines. We show that these asymmetries arise from surface motions associated with the non-radial pulsations (which are discussed in detail in a companion paper). By incorporating surface velocity fields into line profile calculations, we are able to produce models that more closely resemble the observations.
Clemens James Christopher
van Kerkwijk Marten Henric
Wu Yihong
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