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A first optical spectroscopic monitoring of the post-AGB star SAO 96709=IRAS 07134+1005: pulsation and shock waves.
We have performed a spectroscopic monitoring of the F5I "post-AGB" starSAO 96709 on the Hα and NaD spectral regions in order to studyatmospheric motions that could be associated with shock wave propagationthroughout the stellar atmosphere. Twenty-one Hα spectra andseventeen NaD spectra were obtained as regularly as possible, over a 14month interval. We find that the Hα, NaD, and other line profilesare strongly variable on a timescale of a few days. The 5853.688A BaIIand 6587.622A CI lines also reveal a variation in their radialvelocities. Fourier analysis of these variations yields one main periodof 27.3 days and three secondary ones of 32.9, 11.9 and 7.1 days. TheHα profiles and the velocity variations are good evidence forcomplex atmospheric dynamics that are related to shock wave propagationthroughout the atmospheric layers. These observed spectral features arein good agreement with the recently found photometric variability andpoint to a pulsating nature for SAO 96709 = HD 56126 = IRAS 07134+1005.
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