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http://hdl.handle.net/20.500.12386/28739
Titolo: | Swift and SALT observations of the multiple outbursts of MAXI J1957+032 | Autori: | Mata Sánchez, D. Charles, P. A. Armas Padilla, M. Buckley, D. A. H. ISRAEL, Gian Luca Linares, M. Muñoz-Darias, T. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 468 | Fascicolo: | 1 | Da pagina:: | 564 | Abstract: | 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 L<SUB>Edd</SUB>. Assuming this peak luminosity would place MAXI J1957+032 at a distance of d ∼ 5-6 kpc. | URI: | http://hdl.handle.net/20.500.12386/28739 | URL: | https://academic.oup.com/mnras/article/468/1/564/3051681 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx479 | Bibcode ADS: | 2017MNRAS.468..564M | Fulltext: | open |
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