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- Title
XMM-Newton RGS observations of the Cat's Eye Nebula.
- Authors
Guerrero, M. A.; Toalá, J. A.; Chu, Y.-H.; Gruendl, R. A.
- Abstract
We present an analysis of XMM-Newton Reflection Grating Spectrometer (RGS) observations of the planetary nebula (PN) NGC6543. These observations render it the second PN with high-resolution X-ray spectroscopic observations after BD+303639. The observations consist of 26 pointings, 14 of which included RGS observations for a total integration time of 435 ks. Many of these observations, however, were severely affected by high-background levels, and the net useful exposure time is drastically reduced to 25 ks. Only the O vii triplet at 22 Å is unambiguously detected in the RGS spectrum of NGC6543. We find this spectrum consistent with an optically thin plasma at 0.147 keV (1.7 MK) and nebular abundances. Unlike BD+303639, the X-ray emission from NGC6543 does not reveal overabundances of C and Ne. The results suggest that the N/O ratio of the hot plasma is consistent with that of the stellar wind, that is, it is lower than the nebular N/O ratio, but this result is not conclusive.
- Subjects
PLANETARY nebulae; OPTICAL gratings; X-ray spectroscopy; HIGH temperature plasmas; STELLAR winds
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2015, Vol 574, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201424995