2020MNRAS.494.3784T -
Mon. Not. R. Astron. Soc., 494, 3784-3789 (2020)
Chandra observations of the planetary nebula IC 4593.
TOALA J.A., GUERRERO M.A., BIANCHI L., CHU Y.-H. and DE MARCO O.
Abstract (from CDS):
The Advanced CCD Imaging Spectrometer (ACIS-S) camera on board the Chandra X-ray Observatory has been used to discover a hot bubble in the planetary nebula (PN) IC 4593, the most distant PN detected by Chandra so far. The data are used to study the distribution of the X-ray-emitting gas in IC 4593 and to estimate its physical properties. The hot bubble has a radius of ∼2 arcsec and is found to be confined inside the optically bright innermost cavity of IC 4593. The X-ray emission is mostly consistent with that of an optically thin plasma with temperature kT ≃ 0.15 keV (or TX ≃ 1.7 x 106 K), electron density ne ≃ 15 cm–3, and intrinsic X-ray luminosity in the 0.3-1.5 keV energy range LX = 3.4 x 1030 erg s–1. A careful analysis of the distribution of hard (E >0.8 keV) photons in IC 4593 suggests the presence of X-ray emission from a point source likely associated with its central star (CSPN). If this was the case, its estimated X-ray luminosity would be L_X, CSPN_ = 7 x 1029 erg s–1, fulfilling the log(L_X, CSPN/Lbol_) ≃ -7 relation for self-shocking winds in hot stars. The X-ray detection of the CSPN helps explain the presence of high-ionization species detected in the ultraviolet spectra as predicted by stellar atmosphere models.
Abstract Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
stars: low-mass - stars: winds, outflows - planetary nebulae: general - planetary nebulae: IC 4593 - X-rays: general
Simbad objects:
6
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