ASCA observations of Eta Carinae

被引：23

作者：

Tsuboi, Y ^{[1
]}

Koyama, K ^{[1
]}

Sakano, M ^{[1
]}

Petre, R ^{[1
]}

机构：

[1] NASA, GODDARD SPACE FLIGHT CTR, HIGH ENERGY ASTROPHYS LAB, GREENBELT, MD 20771 USA

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 1997年 / 49卷 / 01期

关键词：

stars; abundances; early-type; individual (Eta Carinae); X-rays; spectra;

D O I：

10.1093/pasj/49.1.85

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present ASCA results on the peculiar star eta Car in the center of the Carina Nebula. The X-ray emission from eta Car was found to be attributable to two thermal components: the high-temperature component (kT similar to 5 keV) is consistent with a point source, and is highly absorbed, while the low-temperature plasma (kT similar to 0.7 keV) is extended, and shows no significant circumstellar absorption. We found a line-like structure around 0.5 keV, which is probably due to the Ly alpha line of nitrogen. Using a variable-abundance coronal plasma model, we found that the relative abundance of nitrogen to oxygen is extremely large in comparison with the solar value. This may be the first X-ray evidence of the enrichment of CNO-processed material in an evolved massive star.

引用

页码：85 / 92

页数：8

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