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The Puzzles of RX J1856.5-3754: Neutron Star or Quark Star?
J. E. Truemper, V. Burwitz, F. Haberl +1
We discuss recent Chandra and XMM-Newton observations of the bright isolated neutron star RX J1856.5-3754 and suggest that the absence of any line features is due to effects of a h…
A phase-dependent absorption line in the spectrum of the X-ray pulsar RX J0720.4-3125
F. Haberl, V. E. Zavlin, J. Truemper +1
The XMM-Newton spectra of the isolated neutron star RX J0720.4-3125 show deviations from a Planckian energy distribution below 400 eV, similar to the spectra of RBS1223, another lo…
The weak-line T Tauri star V410Tau I. A multi-wavelength study of variability
B. Stelzer, M. Fernandez, V. M. Costa +10
We present the results of an intensive coordinated monitoring campaign in the optical and X-ray wavelength ranges of the low-mass, pre-main sequence star V410Tau carried out with t…