A photometric and spectroscopic study of the eclipsing symbiotic binary AX Persei

Details A photometric and spectroscopic study of the eclipsing symbiotic binary AX Persei A photometric and spectroscopic study of the eclipsing symbiotic binary AX Persei

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..199s&link_type=abstract

Astronomy and Astrophysics, v.367, p.199-210 (2001)

Astronomy and Astrophysics

Astrophysics

12

Stars: Binaries: Symbiotics, Stars: Circumstellar Matter, Stars: Mass-Loss

Scientific paper

We analysed photometric and spectroscopic optical observations of the eclipsing symbiotic binary AX Persei. For the first time, we present and discuss its historical, 1887-1999, photographic/B-band and visual light curve (LC). The red giant in AX Per losses mass via the wind at a rate of dot M = 7.4+/- 1.7 10-7 Msun yr-1. The terminal velocity of the wind is vinfty = 32 +/- 6 km s-1. We estimated an effective radius of the Hii nebula during the post-outburst stage (to JD 2450000) to be of Rn = 192 +/- 25 Rsun and its average electron concentration ~ ne = (2.9 - 3.6) +/- 0.7 109 cm-3 for the electron temperature Te = 1-1.5 104 K. The [Oiii] nebula in AX Per is rather dense, having the electron concentration ne([Oiii])~ 3 107 cm-3 for Te = 1-1.5 104 K. Spectroscopic observations made in the middle of the 1992.8 and 1994.7 eclipses showed that a significant part of flux emitted in the Hi, Heii and nebular [Oiii] lines originates in the vicinity of the hot component. Transition of AX Per to its nebular phase occurred at/around JD 2450000. A small ~ 0.6 mag brightening at that time and consequently ery broad wave-like variation in the LC developed. This event was caused by dilution of a shell around the hot star, during which about of 1.5 1050 particles ( ~ 1.3 10-7 Msun) were injected into the ionized region. Tables~2 and~3 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/367/199

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