Spectroscopic variations in proto-planetary nebulae with pulsation
Griet Van De Steene  1, @  , Bruce Hrivnak  2, @  , Hans Van Winckel  3, @  
1 : Royal Observatory of Belgium  (ROB)  -  Website
Ringlaan 3 1180 Brussels -  Belgium
2 : Valparaiso University  (VU)
Dept. of Physics & Astronomy, Valparaiso University Valparaiso, IN 46383, USA -  United States
3 : Instituut voor Sterrenkunde  (IvS, KULeuven)

We are carrying out a long-term radial velocity study of seven bright proto-planetary nebulae (PPNe) that possess bipolar or ellipsoidal nebulae. None of the seven show clear evidence of variability due to binarity yet. Their velocity variations are dominated by pulsation. We will present and discuss the changes in relevant atomic and molecular lines over the pulsations cyclus in our O- and C-rich sample.

Subject : : Posters
Topics : Hunt for binaries and transient sky
Keywords : post ; agb ; variability ; spectroscopy
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