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Post-AGB Objects as a Phase of Stellar Evolution (Paperback, Softcover reprint of hardcover 1st ed. 2001)
Loot Price: R4,281
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Post-AGB Objects as a Phase of Stellar Evolution (Paperback, Softcover reprint of hardcover 1st ed. 2001)
Series: Astrophysics and Space Science Library, 265
Expected to ship within 10 - 15 working days
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The term proto-planetary nebulae (PPNe) in the context of the late
stages of stellar evolution was created only slightly more than 20
years ago to express the belief that in the near future these
objects will become planetary nebulae (PNe). The first
proto-planetary nebulae (called also post-Asymptotic Giant Branch,
or shortly post-AGB objects) AFGL 2688 and AFGL 618 were discovered
in mid seventies in course of the Air Force Sky Survey.
Investigation of this phase of stellar evolution developed very
rapidly in 1980's after the IRAS mission when it became clear that
proto-planetary nebulae emit a significant part of their energy in
the mid-and far-infrared. Hundreds of new candidates have been
proposed but the recognition of the real proto-planetary nebulae is
not a simple task and needs a substantial effort to exclude cases
that represent different evolutionary stages. High resolution
spectroscopy of stellar atmospheres is of much importance in this
respect. Surprisingly, only a small group of central stars, the so
called 21 11m emitters, show chemical signatures of the 3 rd dredge
up process. Very recently, a more detailed studies of mid-infrared
spectra from the Infrared Space Observatory (ISO) allow for a
better understanding of chemical composition and evolution of
circumstellar material around these stars. A new impetus in the
field of proto-planetary nebulae research was started in the 1990's
with high spatial resolution imaging in mid-infrared and optical
wavelength ranges."
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