We obtained useful time-resolved high-resolution spectroscopy of Balloon (B=11.8, main period=356 sec) on the 2.6m Nordic Optical Telescope !

  After folding to pulsational phase, the combined spectra have sufficient S/N for detailed analysis.

  Abundances of Balloon are normal for a star of its kind. The abundances do not vary with pulsational phase of the main mode.

  The main-mode radial-velocity amplitude in Aug 2006 was 15 km/s.

  The broadening of the line profiles of Balloon depend on pulsational phase, and the lines are in general much broader than for non-pulsating stars. The lines are pulsationaly broadened.

  We used cross-correlation to combine the pulsational information content of 56 carefully selected spectral lines into a single CCF

  From simple model fits (only 3D velocity field) to the pulsational line-profile variability in the CCFs, we can exclude a possible L=2 origin of the main mode in Balloon. Modes of L≥3 require unrealistic surface pulsation amplitudes and were hence not considered.

  The line-profile variability of the main mode of Balloon is best described by a model of a radial mode, but L=1 modes cannot be excluded. Further detailed modeling of the LPV is necesary to discriminate between an L=0 (i.e. radial) or L=1 origin of the main mode.