On The Hot Component Of The Supersoft X-ray Binary/Symbiotic Variable AG Dra

Details On The Hot Component Of The Supersoft X-ray Binary/Symbiotic Variable AG Dra On The Hot Component Of The Supersoft X-ray Binary/Symbiotic Variable AG Dra

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733808m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #338.08; Bulletin of the American Astronomical Society, Vol. 43, 2011

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AG Dra is a D-Type Symbiotic consisting of a metal-deficient K0-4 giant and a hot white dwarf with an orbital period Porb 550 days
The outburst recurrence time of AG Dra is every 15 years and the duration of the outbursts is 3 - 6 years. From the classification of the giant, a distance of 2.5 kpc has been estimated. The reddening has been estimated to be E(B-V) = 0.05. Greiner et al.(1997) established that the X-ray/FUV flux level of AG Dra is anti-correlated with the optical maxima.
The nature of the hot component (WD + disk?) and rate of accretion has never been determined from synthetic spectral models of high gravity photospheres or optically thick accretion disk models. We have combined archival FUSE +IUE spectra obtained in the same activity state (quiescence) and orbital phase (0.5) of the system. In our NLTE the model fitting, we fixed the inclination i = 41 degrees, and the white dwarf mass = 0.6 M&sun; (log g = 8) consistent with the lower masses inferred for the hot components in other symbiotic systems (Muerset et al.1991).
From the FUSE spectrum alone, with the distance of AG Dra fixed at 2.5 kpc, we obtain a best fit white dwarf model having Teff = 65,000K with a χ 2 = 4.597 and a best fit accretion disk model with Ṁ = 5 × 10-8 M&sun;/yr. If the distance is a free parameter,
then the best fitting accretion disk model (with a chi2 = 3.19) corresponds to Ṁ = 10-8 M&sun;/yr.This fit yields a distance of only 640 pc. Our model results for the combined FUSE +IUE spectra are also presented and discussed.
This work was supported in part by NSF grant AST0807892 to Villanova University.

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