SIMBAD references

2011MNRAS.417..659A - Mon. Not. R. Astron. Soc., 417, 659-665 (2011/October-2)

X-ray softening in the new X-ray transient XTE J1719-291 during its 2008 outburst decay.

ARMAS PADILLA M., DEGENAAR N., PATRUNO A., RUSSELL D.M., LINARES M., MACCARONE T.J., HOMAN J. and WIJNANDS R.

Abstract (from CDS):

The X-ray transient XTE J1719-291 was discovered with Rossi X-ray Timing Explorer/Proportional Counter Array (RXTE/PCA) during its outburst in 2008 March, which lasted at least 46 d. Its 2–10 keV peak luminosity is 7 {x} 1035 erg/s assuming a distance of 8 kpc, which classifies the system as a very faint X-ray transient. The outburst was monitored with Swift, RXTE, Chandra and XMM–Newton. We analysed the X-ray spectral evolution during the outburst. We fitted the overall data with a simple power-law model corrected for absorption and found that the spectrum softened with decreasing luminosity. However, the XMM–Newton spectrum cannot be fitted with a simple one-component model, but it can be fitted with a thermal component (blackbody or disc blackbody) plus a power-law model affected by absorption. Therefore, the softening of the X-ray spectrum with decreasing X-ray luminosity might be due to a change in photon index or alternatively it might be due to a change in the properties of the soft component. Assuming that the system is an X-ray binary, we estimated a long-term time-averaged mass accretion rate of {img}∼ 7.7 {x} 10–13 M/yr for a neutron star as a compact object and {img}∼ 3.7 {x} 10–13 M/yr in the case of a black hole. Although no conclusive evidence is available about the nature of the accretor, based on the X-ray/optical luminosity ratio we tentatively suggest that a neutron star is present in this system.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): accretion, accretion discs - stars: individual: XTE J1719-291 - X-rays: binaries

Simbad objects: 9

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2021.02.26-18:27:34

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