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Cross-calibration results from observations of the INS RX J1856, and the WDs HZ 43 and Sirius B

Vadim Burwitz Intl. Calibration Working Group June 14-16 2006, Iceland
Vadim Burwitz ICWG, June 14, 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 J1856.5-3754 determine spectral parameters improve effective area. Compare obtained photon spectra with EUVE and ROSAT and XMM (work by Frank Haberl)

Vadim Burwitz

ICWG, June 14, 2006


NLTE pure H model spectrum of HZ43
Different bound-free and free-free absorption coefficients

-- Seaton -- Karzas & Latter

Vadim Burwitz

ICWG, June 14, 2006


NLTE pure H model spectrum of HZ43

Vadim Burwitz

ICWG, June 14, 2006


HZ43 temperature vs. gravity

Vadim Burwitz

ICWG, June 14, 2006


RX J1856-37 two temperature bb fit

Vadim Burwitz

ICWG, June 14, 2006


RX J1856-37 two temperature bb fit

Vadim Burwitz

ICWG, June 14, 2006


Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz

ICWG, June 14, 2006


Simultaneous fit to RXJ1856 and the WDs

Vadim Burwitz

ICWG, June 14, 2006


Parameters obtained from fit

Vadim Burwitz

ICWG, June 14, 2006


Comparison of photon spectra
EUVE

Vadim Burwitz

ICWG, June 14, 2006


RX J1856.5­3754: A `stable` neutron star
Individual fits with all parameters free: Simultaneous fits with NH linked:

Model: tbabs*bbody from Frank Haberl
Vadim Burwitz

ICWG, June 14, 2006


Summary

Vadim Burwitz

ICWG, June 14, 2006