XMM-Newton RGS observations of the cat's eye nebula

DOI: 
10.1051/0004-6361/201424995
Publication date: 
01/02/2015
Main author: 
Guerrero M.A.
IAA authors: 
Guerrero M.A.;Toalá J.A.
Authors: 
Guerrero M.A., Toalá J.A., Chu Y.-H., Gruendl R.A.
Journal: 
Astronomy and Astrophysics
Publication type: 
Article
Volume: 
574
Pages: 
Number: 
A1
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 +30°3639. 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 A˚ 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 +30°3639, 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. © ESO 2015.
Database: 
WOK
SCOPUS
ADS
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2015A&A...574A...1G/abstract
ADS Bibcode: 
2015A&A...574A...1G
Keywords: 
Planetary nebulae: general; Planetary nebulae: individual: NGC 6543; Stars: winds, outflows; X-rays: ISM