THE X-RAY ECLIPSE GEOMETRY OF THE SUPER-SOFT X-RAY SOURCE CAL 87
نویسندگان
چکیده
منابع مشابه
The Eclipsing Supersoft X-ray Binary Cal 87
We present and discuss 25 spectra obtained in November 1996, covering all phases of the CAL 87 binary system. These spectra are superior both in signal-to-noise and wavelength coverage to previously published data so that additional spectral features can be measured. Photometry obtained on the same nights is used to confirm the ephemeris and to compare with light curves from previous years. Ana...
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Objective: The use of miniature X-ray source in electronic brachytherapy is on the rise so there is an urgent need to acquire more knowledge on X-ray spectrum production and distribution by a dose. The aim of this research was to investigate the influence of target thickness and geometry at the source of miniature X-ray tube on tube output.Method: Five sources were simulated based on problems e...
متن کاملA BeppoSAX observation of the super - soft source CAL 87
We report on a BeppoSAX Concentrator Spectrometer observation of the super-soft source (SSS) CAL 87. The X-ray emission in SSS is believed to arise from nuclear burning of accreted material on the surface of a white dwarf (WD). An absorbed blackbody spectral model gives a χ 2 ν of 1.18 and a temperature of 42± 13 11 eV. However, the derived luminosity and radius are greater than the Eddington l...
متن کاملVisual light from the eclipsing supersoft X - ray source CAL 87
We calculate the visual light curve of CAL 87 based on the assumption that an accreting steadily burningwhite dwarf irradiates the accretion disk and the secondary star, as suggested by van den Heuvel et al. (1992). We find a reasonable fit including the following sources of visual light: 1. the secondary star where the energy from irradiation is spread out over the surface, 2. the accretion di...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2014
ISSN: 1538-4357
DOI: 10.1088/0004-637x/792/1/20