Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1817k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, June 1988, p. 1817-1827. Research supported by the U.S.-Spanish Joint Committee
Astronomy and Astrophysics
Astronomy
103
Binary Stars, Far Infrared Radiation, Infrared Astronomy Satellite, Red Giant Stars, Stellar Mass Ejection, Symbiotic Stars, Late Stars, Mira Variables, Planetary Nebulae
Scientific paper
IRAS survey data for all known symbiotic binaries are reported. S type systems have 25 micron excesses much 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 rate of about 10 to the -6th solar masses/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. If this interpretation of the data is correct, then the very red near-IR colors of D type symbiotic stars are caused by extreme amounts of dust absorption rather than dust emission. The small group of D prime objects possesses far-IR colors resembling those of compact planetary nebulae or extreme OH/IR stars. It is speculated that these binaries are not symbiotic stars at all, but contain a hot compact star and an exasymptotic branch giant which is in the process of ejecting a planetary nebula shell.
Fernandez-Castro Telmo
Kenyon Scott. J.
Stencel Robert E.
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