2003ApJ...585.1015L -
Astrophys. J., 585, 1015-1023 (2003/March-2)
X-ray spectroscopy of η Carinae with XMM-newton.
LEUTENEGGER M.A., KAHN S.M. and RAMSAY G.
Abstract (from CDS):
We present XMM-Newton observations of the luminous star η Carinae, including a high-resolution soft X-ray spectrum of the surrounding nebula obtained with the Reflection Grating Spectrometer (RGS). The European Photon Imaging Camera (EPIC) image of the field around η Car shows many early-type stars and diffuse emission from hot, shocked gas. The EPIC spectrum of the star is similar to that observed in previous X-ray observations and requires two temperature components. The RGS spectrum of the surrounding nebula shows K-shell emission lines from hydrogen- and helium-like nitrogen and neon and L-shell lines from iron but little or no emission from oxygen. The observed emission lines are not consistent with a single temperature, but the range of temperatures observed is not large, spanning ∼0.15-0.6 keV. We obtain upper limits for oxygen line emission and derive a lower limit of N/O>9. This is consistent with previous abundance determinations for the ejecta of η Car and with theoretical models for the evolution of massive, rotating stars.
Abstract Copyright:
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Journal keyword(s):
Stars: Abundances - Stars: Individual: Constellation Name: η Carinae - Techniques: Spectroscopic - X-Rays: Stars
Simbad objects:
5
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