C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET15:39:25

2004A&A...423..301T - Astronomy and Astrophysics, volume 423, 301-309 (2004/8-3)

Evidence for a Neutron Star in the non-pulsating massive X-ray binary 4U2206+54.


Abstract (from CDS):

We present an analysis of archival RXTE and BeppoSAX data of the X-ray source . For the first time, high energy data (≥30keV) are analyzed for this source. The data are well described by comptonization models (CompTT and BMC) in which seed photons with temperatures between 1.1keV and 1.5keV are comptonized by a hot plasma at 50keV thereby producing a hard tail which extends up to, at least, 100keV. We offer a new method of identification of neutron star systems using a temperature - luminosity relation. If a given X-ray source is characterized by a low bolometric luminosity and a relatively high color blackbody temperature (>1keV) it has necessarily to be a neutron star rather than a black hole. From these arguments it is shown that the area of the soft photon source must be small (r≃1km) and that the accretion disk, if present, must be truncated very far from the compact object. Here we report on the possible existence of a cyclotron line around 30keV. The presence of a neutron star in the system is strongly favored by the available data.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - X-rays: binaries

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3948 0
2 BD+53 2790 HXB 22 07 56.2368407539 +54 31 06.405811141 9.4 10.11 9.84 9.64 9.43 O9.5Vep 174 0

    Equat.    Gal    SGal    Ecl

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