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Title:
ASCA Observations of Eta Carinae
Authors:
Tsuboi, Yohko; Koyama, Katsuji; Sakano, Masaaki; Petre, Robert
Affiliation:
AA(Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-01; (YT):), AB(Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-01; (YT):), AC(Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-01; (YT):), AD(Laboratory for High Energy Astrophysics, NASA/GSFC, Greenbelt, MD 20771, U.S.A.})
Publication:
Publ. of the Astronomical Society of Japan, v.49, p.85-92. (PASJ Homepage)
Publication Date:
02/1997
Origin:
PASJ
PASJ Keywords:
STARS: ABUNDANCES, STARS: EARLY-TYPE, STARS: INDIVIDUAL (ETA CARINAE), STARS: X-RAYS, X-RAYS: SPECTRA
Bibliographic Code:
1997PASJ...49...85T

Abstract

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 ~ 5 keV) is consistent with a point source, and is highly absorbed, while the low-temperature plasma (kT ~ 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 Lyalpha 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.

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