Read e-book online Post-AGB Objects as a Phase of Stellar Evolution PDF

By R. Szczerba,S.K. Górny

The time period proto-planetary nebulae (PPNe) within the context of the overdue levels of stellar evolution was once created merely just a little greater than two decades in the past to specific the idea that during the close to destiny those items becomes planetary nebulae (PNe). the 1st proto-planetary nebulae (called additionally post-Asymptotic titanic department, or presently post-AGB items) AFGL 2688 and AFGL 618 have been found in mid­ seventies in process the Air strength Sky Survey. research of this part of stellar evolution built very quickly in 1980's after the IRAS project while it turned transparent that proto-planetary nebulae emit an important a part of their power within the mid-and far-infrared. hundreds of thousands of latest applicants were proposed however the attractiveness of the genuine proto-planetary nebulae isn't an easy activity and wishes a considerable attempt to exclude circumstances that characterize diversified evolutionary phases. excessive answer spectroscopy of stellar atmospheres is of a lot value during this admire. unusually, just a small crew of crucial stars, the so referred to as 21 11m emitters, exhibit chemical signatures of the three rd dredge­ up procedure. Very lately, a extra certain reports of mid-infrared spectra from the Infrared house Observatory (ISO) let for a greater knowing of chemical composition and evolution of circumstellar fabric round those stars. a brand new impetus within the box of proto-planetary nebulae learn was once all started within the 1990's with excessive spatial answer imaging in mid-infrared and optical wavelength ranges.

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Post-AGB Objects as a Phase of Stellar Evolution (Astrophysics and Space Science Library) by R. Szczerba,S.K. Górny

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