Time-resolved spectroscopy of the M15 X-ray binary AC211/X2127+119

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dc.contributor.author Torres, Manuel Angel Perez
dc.contributor.author Callanan, Paul J.
dc.contributor.author Garcia, M. R.
dc.date.accessioned 2017-11-07T09:38:59Z
dc.date.available 2017-11-07T09:38:59Z
dc.date.issued 2003
dc.identifier.citation Torres, M. A. P., Callanan, P. J. and Garcia, M. R. (2003) 'Time-resolved spectroscopy of the M15 X-ray binary AC211/X2127+119', Monthly Notices of the Royal Astronomical Society, 341(4), pp. 1231-1238. doi:10.1046/j.1365-8711.2003.06486.x en
dc.identifier.volume 341
dc.identifier.issued 4
dc.identifier.startpage 1231
dc.identifier.endpage 1238
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/10468/4988
dc.identifier.doi 10.1046/j.1365-8711.2003.06486.x
dc.description.abstract We present time-resolved spectroscopy acquired during two epochs (spaced apart by similar to15 d) of the eclipsing low-mass X-ray binary AC211/X2127+119 in the globular cluster M15. The spectra show variations in the He iilambda4686 emission line not only modulated on the orbital period, but also on time-scales of a few days. During the first epoch of observation, the emission line shows a strong S -wave superimposed on the average double-peaked profile. The line exhibits no evidence of rotational disturbance at the orbital phases when the eclipse is observed in the optical continuum. During the second epoch, no double-peak or S -wave component is present. The He i absorption lines detected by other authors are not present in our spectra. A Doppler image of He iilambda4686 for the first epoch supports the presence of the accretion disc. No hotspot is detected, although enhanced emission at V-X = 30 km s(-1) , V-Y = 160 km s(-1) is observed. We discuss the implications of this emission in the context of an X-ray heated donor star, in which case a high mass ratio and neutron star primary are implied. Finally, we speculate on the possibility of a misaligned secondary star in AC211. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.relation.uri https://academic.oup.com/mnras/article-lookup/doi/10.1046/j.1365-8711.2003.06486.x
dc.rights © 2003, Royal Astronomical Society en
dc.subject Accretion en
dc.subject Accretion discs en
dc.subject Close en
dc.subject Stars en
dc.subject Individual en
dc.subject AC211 en
dc.subject X2127+119 en
dc.subject X-rays en
dc.subject Binaries en
dc.title Time-resolved spectroscopy of the M15 X-ray binary AC211/X2127+119 en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Manuel Angel Perez Torres, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: mapt@phys.ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Monthly Notices of the Royal Astronomical Society en
dc.internal.IRISemailaddress mapt@phys.ucc.ie en

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