neutron stars - Universität Heidelberg
neutron stars - Universität Heidelberg
neutron stars - Universität Heidelberg
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RXJ 1856: Neutron Star or Quark Star? (Ho et al. (2007))<br />
F λ (ergs s −1 cm −2 A −1 )<br />
10 −12<br />
10 −13<br />
10 −14<br />
10 −15<br />
10 −16<br />
10 −17<br />
10 −18<br />
10 −19<br />
10 −20<br />
10 1<br />
XMM/RGS<br />
CXO/LETG<br />
EUVE<br />
10 2<br />
Wavelength (A)<br />
10 3<br />
HST/STIS<br />
VLT/FORS1<br />
HST/STIS<br />
CXO/LETG<br />
XMM/RGS<br />
EUVE<br />
VLT/FORS2<br />
HST/WFPC2<br />
VLT/FORS1<br />
two-temperature black-body fit implies a lower limit for radiation radius:<br />
R∞ = R/ � 1 − 2GM/R ≈ 17 km (d/140 pc)<br />
thin magmetized H-atmosphere on condensed iron core (Ho et al.):<br />
redshift zg ≈ 0.22: R ≈ 14 km and M ≈ 1.55M⊙<br />
not necessarily a quark star!<br />
10 4<br />
– p.16
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