Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 RX J1856 HZ 43Sirius B Cross-calibration results from observations of the INS RX J1856, and the WDs HZ 43 and.

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Presentation transcript:

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 RX J1856 HZ 43Sirius B Cross-calibration results from observations of the INS RX J1856, and the WDs HZ 43 and Sirius B Vadim Burwitz EPIC CAL/OPS May , MPE

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 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 J  determine spectral parameters  improve effective area.  Compare obtained photon spectra with EUVE and ROSAT and XMM (work by Frank Haberl)

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Overview

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 NLTE pure H model spectrum of HZ43 Different bound-free and free-free absorption coefficients -- Seaton -- Karzas & Latter

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 NLTE pure H model spectrum of HZ43

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 HZ43 temperature vs. gravity

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 HZ43 temperature vs. gravity

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 RX J two temperature bb fit

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 RX J two temperature bb fit

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 LETG + HRC-S effective areas

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Parameters obtained from fit

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Parameters obtained from fit

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Comparison of photon spectra EUVE

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Comparison of photon spectra EUVE

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 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 CAL/OPS, MPE May 4, 2006 Summary

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 HZ 43 residuals

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Comparison Chandra LETGS and EUVE

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 Comparison WD models with ROSAT

Vadim Burwitz EPIC CAL/OPS, MPE May 4, 2006 LETGS long-term lightcurve of HZ43