How Do We Observe a Birth of Planetary Nebula? The Example of V886 Her

Details How Do We Observe a Birth of Planetary Nebula? The Example of V886 Her How Do We Observe a Birth of Planetary Nebula? The Example of V886 Her

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ysc..conf...17k&link_type=abstract

YSC'15 Proceedings of Contributed Papers (eds. Choliy V. Ya., Ivashchenko G.), pp. 17-20

Physics

Scientific paper

Photometric and spectroscopic observations of V886 Her during the last century led to the conclusion that the star belongs to a group of post-AGB objects. Such objects are low to intermediate mass stars in a state of transition between asymptotic giant branch (AGB) and planetary nebula (PN) phases, surrounded by a great amount of matter expelled during AGB. Our photometric UBV(RI)_C observations of V886 Her in 1998-2004 show a gradual decrease in V brightness as the star evolves toward the higher temperatures. We notice a significant blueing of (U-B) index and a reddening of (B-V) index which are affected by a substantial hydrogen emission continuum. Our prismatic spectra (obtained in 2007) confirm a change in H_α flux, which has increased twofold since 1997. It suggests a rapid growth of the ionized volume of hydrogen and the beginning of a fast transition of V886 Her between a protoplanetary and a planetary phases.

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