Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856 HZ 43Sirius B Further work on cross-calibration results obtained from observations of.

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Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856 HZ 43Sirius B Further work on cross-calibration results obtained from observations of the INS RX J1856, and the WDs HZ 43 and Sirius B Vadim Burwitz EPIC Calibration Meeting October 2006, Mallorca

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Overview  Paper on this topic published in 2006 A&A 458, 541  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 J  determine spectral parameters  improve effective area.  Compare obtained photon spectra with EUVE and ROSAT and XMM (work together with Frank Haberl)

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Establishing HZ43 A, Sirius B, and RX J as soft X-ray standards: a cross-calibration between the Chandra LETG+HRC-S, the EUVE spectrometer, and the ROSAT PSPC K. Beuermann, V. Burwitz and T. Rauch The Paper published: 2006 A&A 458, 541

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 NLTE pure H model spectrum of HZ43

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 HZ43 temperature vs. gravity

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J two temperature bb fit

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J two temperature bb fit

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Parameters obtained from fit

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Comparison of photon spectra EUVE

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 RX J1856.5–3754: A `stable‘ neutron star Individual fits withall parameters free: Simultaneous fits withN H linked: Model: tbabs*bbody from Frank Haberl

Vadim Burwitz EPIC Calibration Meeting, October 27, 2006 Summary

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