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Vadim Burwitz EPIC CAL/OPS May 4-5 2006, MPE

Cross-calibration results from observations of the INS RX J1856 , and the WDs HZ 43 and Sirius B. Vadim Burwitz EPIC CAL/OPS May 4-5 2006, MPE. Overview. Absolute Calibration Soft X-rays  dependant on model spectra of WDs

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Vadim Burwitz EPIC CAL/OPS May 4-5 2006, MPE

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  1. Cross-calibration results from observations of theINS RX J1856, and theWDs HZ 43 and Sirius B Vadim Burwitz EPIC CAL/OPS May 4-5 2006, MPE

  2. Overview • Absolute Calibration Soft X-rays  dependant on model spectra of WDs what models to use?, uncertainties? • Analyse LETG + HRC-S data HZ 43A, Sirius B and RX J1856.5-3754  determine spectral parameters  improve effective area. • Compare obtained photon spectra with EUVE and ROSAT and XMM (work by Frank Haberl)

  3. NLTE pure H model spectrum of HZ43 Different bound-free and free-free absorption coefficients -- Seaton -- Karzas & Latter

  4. NLTE pure H model spectrum of HZ43

  5. HZ43 temperature vs. gravity

  6. RX J1856-37 two temperature bb fit

  7. RX J1856-37 two temperature bb fit

  8. Simultaneous fit to RXJ1856 and the WDs

  9. Simultaneous fit to RXJ1856 and the WDs

  10. LETG + HRC-S effective areas

  11. Parameters obtained from fit

  12. EUVE Comparison of photon spectra

  13. RX J1856.5–3754: A `stable‘ neutron star Individual fits with all parameters free: Simultaneous fits with NH linked: Model: tbabs*bbody from Frank Haberl

  14. Summary

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