An hotter isolated neutron star:
1E1207: still
radio-silent, but hottest and associated with a SNR
2 Multiple absorption features at ~0.7 and ~1.4
keV in Chandra and XMM data
+ 1 marginal feature at ~2 keV
1) Sanwal et al. 2002:
1E1207.4-5209
no cyclotron, no H
atmosphere
Þ He atmosphere with B=1.5x1014 G
2) Mereghetti et al. 2002:
Þ Fe or other high Z atmosphere with B»1012 G
3) Hailey and Mori 2002:
Þ He-like oxygen or neon
with B»1012 G