Multiwavelength modelling the SED of supersoft X-ray sources I. The method and examples |
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| Institution: | 1. Department of Physics, Ben-Gurion University, Beer-Sheva 84105, Israel;2. Department of Physics, National Tsing-Hua University, Hsin-Chu 30013, Taiwan;3. Laboratoire d’Astrophysique de Marseille, Université de Provence, Marseille Cedex 13, France;1. Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State 410001, Nigeria;2. NASRDA-Centre for Basic Space Sciences, Nsukka, Enugu State 410001, Nigeria;1. Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, Córdoba, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Av. Rivadavia 1917, Ciudad Autónoma de Buenos Aires, Argentina |
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| Abstract: | Radiation of supersoft X-ray sources (SSS) dominates both the supersof X-ray and the far-UV domain. A fraction of their radiation can be reprocessed into the thermal nebular emission, seen in the spectrum from the near-UV to longer wavelengths. In the case of symbiotic X-ray binaries (SyXBs) a strong contribution from their cool giants is indicated in the optical/near-IR. In this paper I introduce a method of multiwavelength modelling the spectral energy distribution (SED) of SSSs from the supersoft X-rays to the near-IR with the aim to determine the physical parameters of their composite spectra. The method is demonstrated on two extragalactic SSSs, the SyXB RX J0059.1-7505 (LIN 358) in the Small Magellanic Cloud (SMC), RX J0439.8-6809 in the Large Magellanic Cloud (LMC) and two Galactic SSSs, the classical nova RX J2030.5+5237 (V1974 Cyg) during its supersoft phase and the classical symbiotic star RX J1601.6+6648 (AG Dra) during its quiescent phase. The multiwavelength approach overcomes the problem of the mutual dependence between the temperature, luminosity and amount of absorption, which appears when only the X-ray data are fitted. Thus, the method provides an unambiguous solution. It was found that selection of the model (a blackbody or an atmospheric model) is not of crucial importance in fitting the global X-ray/IR SED. The multiwavelength modelling of the SED of SSSs is essential in determining their physical parameters. |
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| Keywords: | Stars: fundamental parameters Stars: binaries: symbiotic X-rays: binaries |
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