SALT observations of the supernova remnant MCSNR J0127-7332 and its
  associated Be X-ray binary SXP 1062 in the SMC
  We report the results of optical spectroscopy of the Small Magellanic Cloud
supernova remnant (SNR) MCSNR J0127-7332 and the mass donor Be star, 2dFS 3831,
in its associated high-mass X-ray binary SXP 1062 carried out with the Southern
African Large Telescope (SALT). Using high-resolution long-slit spectra, we
measured the expansion velocity of the SNR shell of \approx 140 km/s,
indicating that MCSNR J0127-7332 is in the radiative phase. We found that the
observed line ratios in the SNR spectrum can be understood if the local
interstellar medium is ionized by 2dFS 3831 and/or OB stars around the SNR. We
propose that MCSNR J0127-7332 is the result of supernova explosion within a
bubble produced by the stellar wind of the supernova progenitor and that the
bubble was surrounded by a massive shell at the moment of supernova explosion.
We estimated the age of MCSNR J0127-7332 to be \la 10 000 yr. We found that the
spectrum of 2dFS 3831 changes with orbital phase. Namely, the equivalent width
of the Halpha emission line decreased by \approx 40 per cent in \approx 130 d
after periastron passage of the neutron star and then almost returned to its
original value in the next \approx 100 d. Also, the spectrum of 2dFS 3831
obtained closest to the periastron epoch (about three weeks after the
periastron) shows a noticeable emission line of He II \lambda 4686, which
disappeared in the next about two weeks. We interpret these changes as a result
of the temporary perturbation and heating of the disk as the neutron star
passes through it.
