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24 April 2024 |
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Orbital and Superorbital Monitoring of the Be/X-ray binary A0538-66: constraints on the system parameters | | A. F. Rajoelimanana
; P. A. Charles
; P. J. Meintjes
; L. J. Townsend
; M.P.E. Schurch
; A. Udalski
; | | Date: |
30 Sep 2016 | | Abstract: | We combine the decade long photometry of the Be/X-ray binary system A0538-66
provided by the MACHO and OGLE IV projects with high resolution SALT
spectroscopy to provide detailed constraints on the orbital parameters and
system properties. The ~420d superorbital modulation is present throughout, but
has reduced in amplitude in recent years. The well-defined 16.6409d orbital
outbursts, which were a strong function of superorbital phase in the MACHO data
(not occurring at all at superorbital maximum), are present throughout the OGLE
IV coverage. However, their amplitude reduces during superorbital maximum. We
have refined the orbital period and ephemeris of the optical outburst based on
~25 yrs light curves to HJD = 2455674.48 +/- 0.03 + n*16.6409 +/- 0.0003d. Our
SALT spectra reveal a B1 III star with vsini of 285 km/s from which we have
derived an orbital radial velocity curve which confirms the high eccentricity
of e = 0.72 +/- 0.14. Furthermore, the mass function indicates that, unless the
neutron star far exceeds the canonical 1.44 Msun, the donor must be
significantly undermassive for its spectral type. We discuss the implications
of the geometry and our derived orbital solution on the observed behaviour of
the system. | | Source: | arXiv, 1609.9811 | | Services: | Forum | Review | PDF | Favorites | |
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