vadim burwitz epic cal/ops may 4-5 2006, mpe

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

Cross-calibration results from observations of the

INS RX J1856RX J1856, and theWDs HZ 43HZ 43 and Sirius BSirius B

Vadim Burwitz

EPIC CAL/OPS May 4-5 2006, MPE


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)


NLTE pure H model spectrum of HZ43

Different bound-free and free-free absorption coefficients

-- Seaton

-- Karzas & Latter


NLTE pure H model spectrum of HZ43


HZ43 temperature vs. gravity


RX J1856-37 two temperature bb fit


Simultaneous fit to RXJ1856 and the WDs


LETG + HRC-S effective areas


Parameters obtained from fit


Comparison of photon spectra

EUVE


RX J1856.5–3754: A `stable‘ neutron star

Individual fits

with

all parameters

free:

Simu

ltaneous fits

with

NH lin

ked:

Model:tbabs*bbody

from Frank Haberl


Summary

vadim burwitz epic cal/ops may 4-5 2006, mpe

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