X-ray imaging of planetary nebulae with Wolf-Rayet-type central stars: detection of the hot bubble in NGC 40

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Title: X-ray imaging of planetary nebulae with Wolf-Rayet-type central stars: detection of the hot bubble in NGC 40
Author: Montez, Rodolfo; Kastner, Joel; De Marco, Orsola; Soker, Noam
Abstract: We present the results of Chandra X-Ray Observatory observations of the planetary nebulae (PNs) NGC 40 and Hen 2-99. Both PNs feature late-type Wolf-Rayet central stars that are currently driving fast (!1000 km s^-1), massive winds into denser, slow-moving (~10 kms^-1)material ejected during recently terminated asymptotic giant branch (AGB) evolutionary phases. Hence, these observations provide key tests of models of wind-wind interactions in PNs. In NGC 40, we detect faint, diffuse X-ray emission distributed within a partial annulus that lies nested within a ~40" diameter ring of nebulosity observed in optical and near-infrared images. Hen 2-99 is not detected. The inferred X-ray temperature (Tx ~10^6 K) and luminosity (Lx ~2 x10^30 ergs s^-1) of NGC 40 are the lowest measured thus far for any PN displaying diffuse X-ray emission. These results, combined with the ringlike morphology of the X-ray emission from NGC 40, suggest that its X-ray emission arises from a ‘‘hot bubble’’ that is highly evolved and is generated by a shocked, quasi-spherical fast wind from the central star, as opposed to AGB or post-AGB jet activity. In contrast, the lack of detectable X-ray emission from Hen 2-99 suggests that this PN has yet to enter a phase of strong wind-wind shocks.
Description: Also archived in: arXiv :astro-ph/0508346 v1 16 Aug 2005
Record URI: http://hdl.handle.net/1850/1821
Date: 2005-12-10

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