IRAS observations of symbiotic stars

Details IRAS observations of symbiotic stars IRAS observations of symbiotic stars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sao..rept.....k&link_type=abstract

Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States

Astronomy and Astrophysics

Astronomy

Stellar Mass Ejection, Symbiotic Stars, Infrared Astronomy, Red Giant Stars, S Stars, Hot Stars, Stellar Envelopes, Stellar Spectrophotometry, Infrared Astronomy Satellite, Planetary Nebulae, Asymptotic Giant Branch Stars, Mira Variables, Cosmic Dust, Infrared Photometry

Scientific paper

We report IRAS survey data for all known symbiotic binaries. S-type systems have 25 micron excesses larger than those of single red giant stars, suggesting that these objects lose mass more rapidly than do normal giants. D-type objects have far-IR colors similar to those of Mira variables, implying mass loss rates approximately 106 solar mass/yr. The near-IR extinctions of the D-types indicate that their Mira components are enshrouded in optically thick dust shells, while their hot companions lie outside the shells. The small group of D' objects possess far-IR colors resembling those of compact planetary nebulae or extreme OH/IR stars. We speculate that these binaries are not symbiotic stars at all, but contain a hot compact star and an ex-asymptotic branch giant which is in the process of ejecting a planetary nebula shell.

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