Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910309t&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #103.09; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
We present identification for 6 modes on the pulsating white dwarf star G 29-38 using optical time series spectroscopy from the VLT. Using a 6 hour spectral series we find 13 pulsation modes between 200 and 1000 seconds, 5 of which are combinations or harmonics. For the brightest modes, we measure the periodic line shape variations of H-beta, H-gamma, and H-delta. By fitting across each Balmer line, we measure the shape of the spectral line using a combination of independently varying Gaussian and Lorentzian functions. By comapring our measurements with limb-darkened models and previous time series spectroscopy of G 29-38, we confirm the spherical degree of 2 known modes and add the spherical degree of 4 new modes, two of which have a spherical degree greater than 1. These new mode identifications will better constrain asteroseismological models of the interior of this star. Additionally we measure the periodic Doppler shifts of the spectral lines associated with the brightness variations. We place them in the context of the convective driving theory and discuss a new combination mode that has an associated velocity variation. We thank NASA and the AAS for funding this project through the AAS small research grants.
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