SIMBAD references

2005A&A...441..283T - Astronomy and Astrophysics, volume 441, 283 (2005/10-1)

Discovery of a redshifted X-ray emission line in the symbiotic neutron star binary 4U 1700+24.

TIENGO A., GALLOWAY D.K., DI SALVO T., MENDEZ M., MILLER J.M., SOKOLOSKI J.L. and VAN DER KLIS M.

Abstract (from CDS):

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 1keV 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 ∼0.5keV. In the high resolution RGS spectrum we detect a single emission line, centered at 19.19+0.05–0.09Å. 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.

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Journal keyword(s): X-rays: individuals: 4U 1700+24 - stars: neutron - stars: binaries: symbiotic - line: identification

Simbad objects: 3

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