The isolated neutron star RBS1774 revisited

A. D. Schwope, T. Erben, J. Kohnert, G. Lamer, M. Steinmetz, K. Strassmeier, H. Zinnecker, J. Bechtold, E. Diolaiti, A. Fontana, S. Gallozzi, E. Giallongo, R. Ragazzoni, C. De Santis, V. Testa

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We report optical B-band observations with the Large Binocular Telescope (LBT) of the isolated neutron star RBS1774. The stacked image with a total exposure of 2.h5 reveals a candidate optical counterpart at m B = 26.96 0.20 at position α(2000) = 21h43m03.s40, δ(2000) = +06°5417.5, within the joint Chandra and XMM-Newton error circles. We analyse archival XMM-Newton observations and derive revised spectral and positional parameters. The predicted optical flux from the extrapolated X-ray spectrum is likely twice as high as reported before. The measured optical flux exceeds the extrapolated X-ray spectral flux by a factor ̃ 40 (15-60 at 1σ confidence). We interpret our detection and the spectral energy distribution as further evidence of a temperature structure over the neutron star's surface and present a pure thermal model reflecting both the SED and the pulsed fraction of the light curve.

Original languageEnglish (US)
Pages (from-to)267-272
Number of pages6
JournalAstronomy and astrophysics
Issue number1
StatePublished - May 2009


  • Stars: individual: RBS1774
  • Stars: neutron
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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