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http://hdl.handle.net/20.500.12386/27511
Titolo: | A possible solution of the puzzling variation of the orbital period of MXB 1659-298 | Autori: | Iaria, R. Gambino, A. F. Di Salvo, T. Burderi, L. Matranga, M. Riggio, A. SANNA, ALBERTO Scarano, F. D'AI', ANTONINO |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 473 | Fascicolo: | 3 | Da pagina:: | 3490 | Abstract: | MXB 1659-298 is a transient neutron-star low-mass X-ray binary system that shows eclipses with a periodicity of 7.1 h. MXB 1659-298 went to outburst in 2015 August, after 14 years of quiescence. We investigate the orbital properties of this source with a baseline of 40 years, obtained by combining the eight eclipse arrival times present in the literature with 51 eclipse arrival times collected during the last two outbursts. A quadratic ephemeris does not fit the delays associated with the eclipse arrival times and the addition of a sinusoidal term with a period of 2.31 ± 0.02 yr is required. We infer a binary orbital period of P = 7.1161099(3) h and an orbital period derivative of \dot{P}=-8.5(1.2) × 10^{-12} s s<SUP>-1</SUP>. We show that the large orbital period derivative can be explained with a highly non-conservative mass-transfer scenario, in which more than 98 per cent of the mass provided by the companion star leaves the binary system. We predict an orbital period derivative value of \dot{P}=-6(3) × 10^{-12} s s<SUP>-1</SUP> and constrain the companion-star mass between 0.3 and 1.2 M<SUB>☉</SUB>. Assuming that the companion star is in thermal equilibrium, the periodic modulation can be due to either a gravitational quadrupole coupling arising from variations of the oblateness of the companion star or the presence of a third body of mass M<SUB>3</SUB> > 21 Jovian masses. | URI: | http://hdl.handle.net/20.500.12386/27511 | URL: | https://academic.oup.com/mnras/article/473/3/3490/4628110 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx2529 | Bibcode ADS: | 2018MNRAS.473.3490I | Fulltext: | open |
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