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Title:
He 2-104 - A link between symbiotic stars and planetary nebulae?
Authors:
Lutz, Julie H.; Kaler, James B.; Shaw, Richard A.; Schwarz, Hugo E.; Aspin, Colin
Affiliation:
AA(Washington State University, Pullman), AB(Illinois, University, Urbana), AC(NASA, Goddard Space Flight Center; Computer Sciences Corp., Greenbelt, MD), AD(European Southern Observatory, Santiago, Chile), AE(Joint Astronomy Center, Hilo, HI)
Publication:
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Nov. 1989, p. 966-977. Previously announced in STAR as N89-30139. (PASP Homepage)
Publication Date:
11/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ACCRETION DISKS, PLANETARY NEBULAE, STELLAR MASS EJECTION, STELLAR MODELS, STELLAR SPECTRA, SYMBIOTIC STARS, ASTRONOMY, ESTIMATES, INFRARED RADIATION, INTERSTELLAR MATTER, RED GIANT STARS, ULTRAVIOLET RADIATION
DOI:
10.1086/132560
Bibliographic Code:
1989PASP..101..966L

Abstract

Ultraviolet, optical and infrared observations of He 2-104 are presented, and estimates for some of the physical properties of the nebular shell are made. It is argued that He 2-104 is in transition between the D-type symbiotic star and bipolar planetary nebula phases and, as such, represents a link between subclasses of these two types of objects. The model includes a binary system with a Mira variable and a hot, evolved star. Previous mass loss has resulted in the formation of a disk of gas and dust around the whole system, while the hot star has an accretion disk which produces the observed highly ionized emission line spectrum. Emission lines from cooler, lower density gas is also observed to come from the nebula. In addition, matter is flowing out of the system in a direction perpendicular to the disk with a high velocity and is impacting upon the previously-ejected red giant wind and/or the ambient interstellar medium.

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