HR4049: signature of nova nucleosynthesis ?

Details HR4049: signature of nova nucleosynthesis ? HR4049: signature of nova nucleosynthesis ?

2004-08-16

arxiv.org/abs/astro-ph/0408286v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, submitted for the proceedings of the 8th Nuclei in the Cosmos symposium (Vancouver, Canada, 19-23 July 200

Scientific paper

10.1016/j.nuclphysa.2005.05.130

The post-Asymptotic Giant Branch (AGB) star HR4049 is in an eccentric binary system with a relatively short period probably surrounded by a dusty circumbinary disk. Extremely anomalous oxygen isotopic ratios, O16/O17 ~ O16/O18 ~ 7, have been measured from CO_2 molecules likely residing in the disk. Such a composition cannot be explained in the framework of AGB and post-AGB evolution while it can be qualitatively associated with the nucleosynthesis occurring during nova outbursts. We discuss nova models, the presence of a white dwarf companion to HR4049 and possible scenarios for the dynamical evolution of this binary system. Circumbinary disks in which mixing occurs between red-giant and nova material may also be invoked as the site of formation of some rare types of meteoritic presolar grains.

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