1. XMM-Newton RGS observations of the Cat's Eye Nebula.
- Author
-
Guerrero, M. A., Toalá, J. A., Chu, Y.-H., and Gruendl, R. A.
- Subjects
PLANETARY nebulae ,OPTICAL gratings ,X-ray spectroscopy ,HIGH temperature plasmas ,STELLAR winds - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF