Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.0610k&link_type=abstract
American Astronomical Society Meeting 206, #06.10; Bulletin of the American Astronomical Society, Vol. 37, p.437
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
We report the detection by the Chandra X-ray Observatory (CXO) of diffuse X-ray emission from NGC 40, a planetary nebula (PN) with a late-type ([WC8]), Wolf-Rayet central star. Such ``[WC] PNs'' are presently driving fast (200-1000 km s-1), massive winds into denser, slow-moving ( ˜ 10 km s-1) material ejected during recently terminated asymptotic giant branch evolutionary phases. Hence, X-ray observations of [WC] PNs should provide insight into the nature of energetic wind-wind shocks. The X-ray surface brightness of NGC 40, which is near the limit of detectability of CXO's Advanced CCD Imaging Spectrometer (ACIS) in our 20 ks exposure, is distributed within a partial annulus with outer radius Ro ˜ 20'' and inner radius Ri ˜ 10''. This annulus is nested within ring-like nebulosity observed in near-infrared images. The detection of annular X-ray emission suggests that in this PN the X-ray emitting gas results from the fast wind of the central star, rather than from the jet activity that is apparent in optical imaging of NGC 40. We also obtained a 29 ks CXO/ACIS exposure of Hen 2-99, which harbors a [WC9] nucleus, and failed to detect X-ray emission. Combining these results with previous X-ray detections and nondetections of PNs by CXO and XMM-Newton, we find evidence for a link between the evolutionary timescales of X-ray and infrared emission from PNs.
This research is supported by NASA through Chandra award number GO4--5169X issued to Rochester Institute of Technology by the Chandra X-ray Observatory Center, which is operated by Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8--03060.
de Marco Orsola
Kastner Joel H.
Montez Rodolfo
Soker Noam
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