HR4049: signature of nova nucleosynthesis?

被引：7
|
作者：
Lugaro, M
Pols, O
Karakas, AI
Tout, CA
机构：
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[2] Univ Utrecht, Astron Inst, NL-3508 TA Utrecht, Netherlands
[3] St Marys Univ, Dept Phys & Astron, Inst Computat Astrophys, Halifax, NS B3H 3C3, Canada
来源：
NUCLEAR PHYSICS A | 2005年 / 758卷
关键词：
D O I：
10.1016/j.nuclphysa.2005.05.130
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
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, O-16/O-17 similar or equal to O-16/O-18 similar or equal to 7, have been measured from CO2 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.
引用
收藏
页码：725C / 728C
页数：4
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