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.
Original language | English (US) |
---|---|
Article number | A1 |
Journal | Astronomy and Astrophysics |
Volume | 574 |
DOIs | |
State | Published - Feb 1 2015 |
Keywords
- Planetary nebulae: general
- Planetary nebulae: individual: NGC 6543
- Stars: winds, outflows
- X-rays: ISM
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science