TY - JOUR
T1 - XMM-Newton RGS observations of the cat's eye nebula
AU - Guerrero, M. A.
AU - Toalá, J. A.
AU - Chu, Y. H.
AU - Gruendl, R. A.
N1 - Funding Information:
J.A.T. and M.A.G. are partially funded by AYA 2005-01495 of the Spanish MEC (Ministerio de Educacion y Ciencia) and AYA 2011-29754-C03-02 of the Spanish MICINN (Ministerio de Ciencia e Innovación) co-funded with FEDER funds. J.A.T. acknowledges support by the CSIC JAE-Pre student grant 2011-00189. Y.-H.C. and R.A.G. acknowledge the support of the NASA XMM-Newton Guest Observer grant NNG06GE67G for this research project. We thank the referee, J.H. Kastner, for his helpful comments.
Publisher Copyright:
© ESO 2015.
PY - 2015/2/1
Y1 - 2015/2/1
N2 - 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.
AB - 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.
KW - Planetary nebulae: general
KW - Planetary nebulae: individual: NGC 6543
KW - Stars: winds, outflows
KW - X-rays: ISM
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U2 - 10.1051/0004-6361/201424995
DO - 10.1051/0004-6361/201424995
M3 - Article
AN - SCOPUS:84921344786
SN - 0004-6361
VL - 574
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A1
ER -