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• W3100473152 abstract "Two symbiotic stars in the Small Magellanic Cloud (SMC), Lin 358 and SMC 3, have been supersoft X-ray sources (SSS) for more than 10 years. We fit atmospheric and nebular models to their X-ray, optical and UV spectra obtained at different epochs. The X-ray spectra are extremely soft, and appear to be emitted by the white dwarf atmosphere and not by the nebula like in some other symbiotics. The white dwarf of SMC 3, the hottest of the two sources, had a constant effective temperature ~500,000 K at various epochs during 12 years. No nova-like outbursts of these systems have been recorded in the last 50 years, despite continuous optical monitoring of the SMC, and there are no indications of cooling of the white dwarf, expected after a thermonuclear flash. The bolometric luminosity of this system in March of 2003 was more than an order of magnitude lower than three years later, however the time of the observation is consistent with a partial eclipse of the white dwarf, previously found in ROSAT and optical observations. The red giant wind is either very asymmetric or very clumpy. The conpact object of Lin 358 has been at T>~180,000 K since 1993, perhaps with a moderate increase. Atmospheric fits are obtained with log(g)>=9, appropriate only for WD mass >1.18 M(sol). The two systems are probably accreting and burning hydrogen steadily at the high rate required for type Ia supernova progenitors." @default.
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• W3100473152 date "2007-06-01" @default.
• W3100473152 modified "2023-10-17" @default.
• W3100473152 title "Two SMC Symbiotic Stars Undergoing Steady Hydrogen Burning" @default.
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• W3100473152 doi "https://doi.org/10.1086/514806" @default.
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