Bibcode
Montez, Rodolfo; Kastner, J. H.; Balick, B.; Behar, E.; Blackman, E.; Bujarrabal, V.; Chu, Y.-H.; Corradi, R. L. M.; De Marco, O.; Frank, A.; Frew, D.; Guerrero, M.; Kwok, S.; Lopez, J. A.; Miszalski, B.; Nordhaus, J.; Parker, Q.; Sahai, R.; Sandin, C.; Schoenberner, D.; Soker, N.; Sokoloski, J.; Steffen, W.; Ueta, T.; Villaver, E.; Zijlstra, A.
Referencia bibliográfica
Planetary Nebulae: An Eye to the Future, Proceedings of the International Astronomical Union, IAU Symposium, Volume 283, p. 450-451
Fecha de publicación:
8
2012
Número de citas
0
Número de citas referidas
0
Descripción
We are presently using the Chandra X-ray Observatory to conduct the
first systematic X-ray survey of planetary nebulae (PNe) in the solar
neighborhood. The Chandra Planetary Nebula Survey (ChanPlaNS) is a 570
ks Chandra Cycle 12 Large Program targeting 21 high-excitation PNe
within ~1.5 kpc of Earth. When complete, this survey will provide a
suite of new X-ray diagnostics that will inform the study of late
stellar evolution, binary star astrophysics, and wind interactions.
Among the early results of ChanPlaNS (when combined with archival
Chandra data) is a surprisingly high detection rate of relatively hard
X-ray emission from CSPNe. Specifically, X-ray point sources are clearly
detected in roughly half of the ~30 high-excitation PNe observed thus
far by Chandra, and all but one of these X-ray-emitting CSPNe display
evidence for a hard (few MK) component in their Chandra spectra. Only
the central star of the Dumbbell appears to display ``pure'' hot
blackbody emission from a ~200 kK hot white dwarf photosphere in the
X-ray band. Potential explanations for the``excess'' hard X-ray emission
detected from the other CSPNe include late-type companions (heretofore
undetected, in most cases) whose coronae have been rejuvenated by recent
interactions with the mass-losing WD progenitor, non-LTE effects in hot
white dwarf photospheres, self-shocking variable winds from the central
star, and slow (re-)accretion of previously ejected red giant envelope
mass.