SIMBAD references

2017MNRAS.468..564M - Mon. Not. R. Astron. Soc., 468, 564-569 (2017/June-2)

Swift and SALT observations of the multiple outbursts of MAXI J1957+032.

MATA SANCHEZ D., CHARLES P.A., ARMAS PADILLA M., BUCKLEY D.A.H., ISRAEL G.L., LINARES M. and MUNOZ-DARIAS T.

Abstract (from CDS):

The new recurrent X-ray transient MAXI J1957+032 has had four X-ray outbursts within 16 months, all very briefly detected (lasting <5 d). During the most recent event (2016 September/October), we obtained with the Southern African Large Telescope the first optical spectrum of the transient counterpart, showing the classic blue continuum of an X-ray irradiated disc in an LMXB and no other features. At high Galactic latitude below the plane (-13°) reddening is low but there is no quiescent counterpart visible on any of the existing sky surveys, nor any other known X-ray source in the region. Swift monitoring of three of the four events is presented, showing rapidly fading X-ray outbursts together with significant UVOT detections in the UV (W1,M2,W2), U and B bands. The optical properties are most like those of the short-period LMXBs, which, combined with the softening witnessed during the decay to quiescence would place the system at d < 13 kpc. The short duration and short recurrence time of the outbursts are reminiscent of the accreting millisecond X-ray pulsars, which exhibit peak luminosities of ∼ 1 per cent LEdd. Assuming this peak luminosity would place MAXI J1957+032 at a distance of d ∼ 5-6 kpc.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - X-rays: binaries - X-rays: binaries

Simbad objects: 22

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2022.12.08-12:08:33

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