SIMBAD references

2019ApJ...886...30T - Astrophys. J., 886, 30-30 (2019/November-3)

A carbon-rich hot bubble in the planetary nebula NGC 5189.

TOALA J.A., MONTEZ R. and KAROVSKA M.

Abstract (from CDS):

We present the discovery of extended X-ray emission from the planetary nebula (PN) NGC 5189 around the [WO1]-type WD 1330-657 with XMM-Newton. The X-ray-emitting gas fills the cavities detected in the Hubble Space Telescope [O III] narrowband image and presents a limb-brightened morphology toward the outer edges of the east and west lobes. The bulk of the X-ray emission is detected in the soft (0.3-0.7 keV) band with the XMM-Newton EPIC spectra dominated by the C VI Lyα line at 0.37 keV (=33.7 Å). Spectral analysis resulted in carbon and neon abundances 38 and 6 times their solar values, with a plasma temperature of kT = 0.14 ± 0.01 keV (T = 1.6 x 106 K) and X-ray luminosity of LX = (2.8 ± 0.8) x 1032 erg s–1. NGC 5189 is an evolved and extended PN (<=0.70 pc in radius), thus, we suggest that the origin of its X-ray emission is consistent with the born-again scenario in which the central star becomes carbon-rich through an eruptive very late thermal pulse, subsequently developing a fast, carbon-rich wind powering the X-ray emission as suggested for A 30 and A 78.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Planetary nebulae - Wolf-Rayet stars - Stellar winds - Stellar wind bubbles - X-ray sources

Simbad objects: 9

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