On the nature of the symbiotic binary AX Persei

Details On the nature of the symbiotic binary AX Persei On the nature of the symbiotic binary AX Persei

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..579m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 579-592. Research supported by University of Torun and Smithsonia

Astronomy and Astrophysics

Astrophysics

60

Accretion Disks, Red Giant Stars, Stellar Evolution, Stellar Spectra, Symbiotic Stars, Emission Spectra, Forbidden Transitions, Light Curve, Main Sequence Stars, Stellar Mass, Stellar Spectrophotometry

Scientific paper

Photometric and spectroscopic observations of the symbiotic binary AX Persei are presented. This system contains a red giant that fills its tidal lobe and transfers material into an accretion disk surrounding a low-mass main-sequence star. The stellar masses - 1 solar mass for the red giant and about 0.4 solar mass for the companion - suggest AX Per is poised to enter a common envelope phase of evolution. The disk luminosity increases from L(disk) about 100 solar luminosity in quiescence to L(disk) about 5700 solar luminosity in outburst for a distance of d = 2.5 kpc. Except for visual maximum, high ionization permitted emission lines - such as He II - imply an EUV luminosity comparable to the disk luminosity. High-energy photons emitted by a hot boundary layer between the disk and central star ionize a surrounding nebula to produce this permitted line emission. High ionization forbidden lines form in an extended, shock-excited region well out of the binary's orbital plane and may be associated with mass loss from the disk.

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