The outflows from the symbiotic nebulae He 2--147 and HM SGE

Details The outflows from the symbiotic nebulae He 2--147 and HM SGE The outflows from the symbiotic nebulae He 2--147 and HM SGE

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe..67b&link_type=abstract

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199

Astronomy and Astrophysics

Astronomy

Scientific paper

Symbiotic stars, which are interacting binary stars usually composed by a late type giant and a very hot/luminous white dwarf, are a powerful laboratory to investigate mass loss phenomenon relevant to a wide range of astrophysical topics: aspherical mass loss, collimated winds from accretion disks, colliding winds, mass loss induced by violent thermonuclear outbursts and its interaction with old circumstellar wind-remnants and the interstellar medium. In recent years, we have discovered optical emission nebulae around 8 symbiotic stars, which represent a large fraction of the complete sample known to date. These extended (0.02 to 2~pc) nebulae are the key to reconstruct the mass loss history from these systems in the last <2000 years. The observation of (multiple) bipolar nebulae, elliptical and ring-like objects, knotty collimated ejecta, and bended jets indicates that a wide variety of dynamical processes has to be considered in order to fully account for the morphological and kinematical properties of the nebulae. We present here a detailed kinematical study, at high spectral (R=40000) and spatial (<=0.5 arcsec) resolutions, of the ring nebula around He 2--147 and of the complex ejecta of HM Sge.

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