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Orbital and superorbital monitoring of the Be/X-ray binary A0538-66: constraints on the system parameters

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cris.lastimport.scopus2024-02-12T20:08:13Z
dc.abstract.enWe combine the decade-long photometry of the Be/X-ray binary system A0538-66 provided by the Massive astrophysical compact halo object (MACHO) and optical gravitational lensing experiment (OGLE) IV projects with high-resolution Southern African Large Telescope (SALT) spectroscopy to provide detailed constraints on the orbital parameters and system properties. The ∼420 d superorbital modulation is present throughout, but has reduced in amplitude in recent years. The well-defined 16.6409 d 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 yr light curves to HJD = 2455674.48 ± 0.03 + n*16.6409 ± 0.0003d. Our SALT spectra reveal a B1 III star with vsin I of 285 kms<SUP>-1</SUP> 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 M<SUB>☉</SUB>, 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.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorRajoelimanana, A. F.
dc.contributor.authorCharles, P. A.
dc.contributor.authorMeintjes, P. J.
dc.contributor.authorTownsend, L. J.
dc.contributor.authorSchurch, M. P. E.
dc.contributor.authorUdalski, Andrzej
dc.date.accessioned2024-01-25T16:09:02Z
dc.date.available2024-01-25T16:09:02Z
dc.date.copyright2016-09-30
dc.date.issued2017
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number4
dc.description.versionORIGINAL_AUTHOR
dc.description.volume464
dc.identifier.doi10.1093/MNRAS/STW2534
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/115025
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2017MNRAS.464.4133R
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages4133-4144
dc.rightsOther
dc.sciencecloudnosend
dc.titleOrbital and superorbital monitoring of the Be/X-ray binary A0538-66: constraints on the system parameters
dc.typeJournalArticle
dspace.entity.typePublication