TY - JOUR
T1 - X-ray emission by a shocked fast wind from the central stars of planetary nebulae
AU - Akashi, Muhammad
AU - Soker, Noam
AU - Behar, Ehud
N1 - Copyright:
Copyright 2006 Elsevier B.V., All rights reserved.
PY - 2006/6
Y1 - 2006/6
N2 - We calculate the X-ray emission from the shocked fast wind blown by the central stars of planetary nebulae (PNe) and compare with observations. Using spherically symmetric self-similar solutions, we calculate the flow structure and X-ray temperature for a fast wind slamming into a previously ejected slow wind. We find that the observed X-ray emission of six PNe can be accounted for by shocked wind segments that were expelled during the early-PN phase, if the fast wind speed is moderate, , and the mass-loss rate is a few times . We find, as proposed previously, that the morphology of the X-ray emission is in the form of a narrow ring inner to the optical bright part of the nebula. The bipolar X-ray morphology of several observed PNe, which indicates an important role of jets, rather than a spherical fast wind, cannot be explained by the flow studied here.
AB - We calculate the X-ray emission from the shocked fast wind blown by the central stars of planetary nebulae (PNe) and compare with observations. Using spherically symmetric self-similar solutions, we calculate the flow structure and X-ray temperature for a fast wind slamming into a previously ejected slow wind. We find that the observed X-ray emission of six PNe can be accounted for by shocked wind segments that were expelled during the early-PN phase, if the fast wind speed is moderate, , and the mass-loss rate is a few times . We find, as proposed previously, that the morphology of the X-ray emission is in the form of a narrow ring inner to the optical bright part of the nebula. The bipolar X-ray morphology of several observed PNe, which indicates an important role of jets, rather than a spherical fast wind, cannot be explained by the flow studied here.
KW - Stars: mass-loss
KW - Stars: winds, outflows
KW - X-rays: ISM
UR - http://www.scopus.com/inward/record.url?scp=33744551536&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2006.10234.x
DO - 10.1111/j.1365-2966.2006.10234.x
M3 - 文章
AN - SCOPUS:33744551536
VL - 368
SP - 1706
EP - 1716
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 4
ER -