The second death of Sakurai's Object (V4334 Sgr)

被引：0
|
作者：
Zijlstra, AA [1 ]
Hajduk, M [1 ]
Herwig, F [1 ]
van Hoof, P [1 ]
Kerber, F [1 ]
机构：
[1] Univ Manchester, Sch Phys & Astron, Manchester M60 1QD, Lancs, England
来源：
PLANETARY NEBULAE AS ASTRONOMICAL TOOLS | 2005年 / 804卷
关键词：
stars : post-AGB; evolution; individual : V4334 Sgr; circumstellar matter;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The discovery of Sakurai's Object, in 1996, provided the first modern observations of a very late thermal pulse. Models predicted that it would become a born-again planetary nebula over a few hundred years. It is however evolving very much faster: the first radio detection shows that ionization of the envelope has already started. To reproduce its unexpectedly fast evolution, we have developed a model in which convective mixing is strongly suppressed under the influence of flash burning. A strong prediction of this model is that the star will evolve back to very high temperatures at equally accelerated time scales. A CLOUDY photoionization model of the hydrogen-poor nebula indicates an ionized ejecta (carbon) mass of similar to 10(-3) M-circle dot, indicating that born-again objects may be significant contributors to carbonaceous dust in the galaxy.
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页码：183 / 186
页数：4
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