Localization of the X-ray burster KS 1731-260 from Chandra data |
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| Authors: | M G Revnivtsev R A Sunyaev |
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| Institution: | (1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia;(2) Max-Planck Institut für Astrophysik, Karl Schwarzschild Strasse 1, 86740 Garching-bei-München, Germany |
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| Abstract: | We analyze Chandra observatory images of the field of the X-ray burster KS 1731-260. A factor of 10 to 15 improvement in the localization accuracy (up to ～0.6″) has allowed a possible candidate for counterparts of KS 1731-260 to be determined from infrared sky images (Barret et al. 1998). The possible counterpart (the sky position difference is ～1.46″, i.e., less than 2σ) is a 16th magnitude star in the J band. If this star is actually an infrared counterpart of KS 1731-260, then we can estimate its luminosity and the lower limit on the counterpart total luminosity, L>L J,H ~10L ⊙. The sharp decline in the X-ray flux from KS 1731-260 in 2001 offers an additional test of whether the proposed candidate is actually a counterpart of KS 1731-260. If the optical and infrared luminosities of this counterpart are largely attributable to reradiation of the X-ray flux from the neutron star, as is the case in low-mass X-ray binaries, then the brightness of the counterpart star must decrease sharply in 2001, after the X-ray source is turned off. |
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| Keywords: | Mir— Kvant TTM pulsars neutron stars and black holes X-ray binaries KS 1731-260 |
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