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Resonant Scattering and Recombination in CAL 87

  • J. Greiner (a1), A. Iyudin (a1) (a2), M. Jimenez-Garate (a3), V. Burwitz (a1), R. Schwarz (a4), R. DiStefano (a5) and N. Schulz (a3)...

Abstract

The eclipsing supersoft X-ray binary CAL 87 has been observed with Chandra on August 13/14, 2001 for nearly 100 ksec, covering two full orbital cycles and three eclipses. The shape of the eclipse light curve derived from the zeroth-order photons indicates that the size of the X-ray emission region is about 1.5 R. The ACIS/LETG spectrum is completely dominated by emission lines without any noticeable continuum. The brightest emission lines are significantly redshifted and double-peaked, suggestive of emanating in a 2000 km/s wind. We model the X-ray spectrum by a mixture of recombination and resonant scattering. This allows us to deduce the temperature and luminosity of the ionizing source to be kT ~ 50 — 100 eV and Lx ~ 5 x 1037 erg/s.

Resumen

Se observó la binaria (eclipsante de rayos X supersuave CAL 87 con Chandra el 13/14 de agosto de 2001, durante; casi 100 ksec, completando dos ciclos orbitales totales y tres eclipses. La forma de la curva de luz del eclipse derivada de los fotones de orden cero indica que el tamano de la región de emisión de rayos X es de alrededor de 1.5 R El espectro ACIS/LETG está dominado por completo por las líneas de emisión sin ningún continuo apreciable. Las líneas de emisión más brillantes presentan un corrimiento al rojo significativo y dos picos, sugiriendo que se producen en un viento de 2000 km/s. Realizamos un modelo del espectro de rayos X mezclando la dispersión de recombinación y resonancia. Esto nos permite deducir que la temperatura y la luminosidad de la fuente ionizante son kT ~ 50 — 100 eV y Lx ~ 5 x 1037 erg/s, respectivamente

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References

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