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Figure 1: Time-resolved high-resolution spectroscopy of Balloon 090100001 after binning the 842 spectra of August 2006 according to the phase of the main pulsation mode. We here show the spectral region of the SiIII triplet: mean spectrum (top), and mean-subtracted phase-binned spectra (middle and lower panels). The grey-scale bar indicates the cut levels used for the bottom plot. |
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Figure 2: As Fig. 1, showing many variable lines of OII and NII. |
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Figure 3: Fits to the line profiles of a phase-binned spectrum, used for abundance and broadening analysis. The observations are drawn in histogram style. |
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Figure 4: Main pulsation mode radial-velocity variation as obtained from the cross-correlation analysis. |
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Figure 5:
Observed cross-correlation functions (CCFs), offset as a
function of pulsation phase by 0.1 continuum units (phase is
increasing upwards), with the mean of all CCFs at the top. In the
left panel we have overplotted model profiles for a radial pulsation
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