A study of the new X-ray transient RXTE J2123−058 during its post-outburst state |
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| Authors: | Roberto Soria Kinwah Wu Duncan K Galloway |
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| Institution: | Research School of Astronomy and Astrophysics, Australian National University, Private Bag, Weston Creek PO, ACT 2611, Australia; Research Centre for Theoretical Astrophysics, School of Physics, University of Sydney, NSW 2006, Australia; Physics Department, University of Tasmania, GPO Box 252-21, Hobart, TAS 7001, Australia |
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| Abstract: | We carried out I , R , V and B photometric observations of the neutron star X-ray binary RXTE J2123?058 shortly after the end of the X-ray outburst in mid-1998. We adopt the low-mass binary model to interpret our observations. After folding our data on the 0.24 821‐d orbital period, and correcting for the steady brightness decline following the outburst, we observed sinusoidal oscillations with hints of ellipsoidal modulations which became progressively more evident. Our data also show that the decline in brightness was faster in the V band than in the R and I bands. This suggests both the cooling of an irradiation-heated secondary star and the fading of an accretion disc over the nights of our observations. |
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| Keywords: | accretion accretion discs binaries: close stars: individual: RXTE J2123?058 stars: neutron X-rays: stars |
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