On the nature of the symbiotic star BF Cygni

Details On the nature of the symbiotic star BF Cygni On the nature of the symbiotic star BF Cygni

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1427m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Oct. 1989, p. 1427-1443. Research supported by the Uniwersytet w Toruniu.

Astronomy and Astrophysics

Astronomy

54

Stellar Spectra, Symbiotic Stars, Ultraviolet Astronomy, Visible Spectrum, Giant Stars, Hot Stars, M Stars, Planetary Nebulae, Stellar Mass Ejection

Scientific paper

Optical and ultraviolet spectroscopy of the symbiotic binary BF Cyg obtained during 1979-1988 is discussed. This system consists of a low-mass M5 giant filling about 50 percent of its tidal volume and a hot, luminous compact object similar to the central star of a planetary nebula. The binary is embedded in an asymmetric nebula which includes a small, high-density region and an extended region of lower density. The larger nebula is formed by a slow wind ejected by the cool component and ionized by the hot star, while the more compact nebula is material expelled by the hot component in the form of a bipolar wind. The analysis indicates that disk accretion is essential to maintain the nuclear burning shell of the hot star.

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