Polarimetric analysis of mass transfer in the X-ray transient A0538-66

Astronomy and Astrophysics – Astronomy

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B Stars, Polarimetry, Stellar Rotation, X Ray Stars, Mass Transfer, Neutron Stars

Scientific paper

Observations of optical polarimetric variations of the recurrent X-ray transient A0538-66 during outbursts 99 and 75 are used to investigate the redistribution of gas in the system during periastron passage. The results are consistent with the polarization arising from light in the primary (Be-star) neighborhood which is scattered off a Be-star type disk and a large gas cloud created near periatron by the neutron star passage. It is suggested that the cloud persists near the periastron direction for longer than the Keplerian rotation time of the inner Be-star disk.

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