[vsnet-campaign-symbio 100] 4U 1700+24 = V934 Her

[Taichi Kato]

4U 1700+24 = V934 Her

   The following astro-ph article would be of potential interest.
The optical counterpart is V934 Her, a bright SRB: star.

Paper: astro-ph/0506590
Date: Fri, 24 Jun 2005 12:33:00 GMT   (46kb)

Title: Discovery of a redshifted X-ray emission line in the symbiotic neutron
  star binary 4U 1700+24
Authors: A. Tiengo, D. K. Galloway, T. di Salvo, M. Mendez, J. M. Miller, J. L.
  Sokoloski, M. van der Klis
Comments: 5 pages, 2 figures, A&A accepted
\\
  We present the spectral analysis of an XMM-Newton observation of the X-ray
binary 4U 1700+24, performed during an outburst in August 2002. The EPIC-PN
spectrum above 1 keV can be modeled by a blackbody plus Comptonization model,
as in previous observations. At lower energies, however, we detect a prominent
soft excess, which we model with a broad Gaussian centered at ~0.5 keV. In the
high resolution RGS spectrum we detect a single emission line, centered at
19.19^{+0.05}_{-0.09} \AA. We discuss two possible interpretations for this
line: O VIII at redshift z=0.012^{+0.002}_{-0.004} or Ne IX at redshift z~0.4.
\\ ( http://arXiv.org/abs/astro-ph/0506590 ,  46kb)