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

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dc.contributor.authorTorres, Manuel Angel Perez
dc.contributor.authorCallanan, Paul J.
dc.contributor.authorGarcia, M. R.
dc.date.accessioned2017-11-07T09:38:59Z
dc.date.available2017-11-07T09:38:59Z
dc.date.issued2003
dc.description.abstractWe 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.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationTorres, 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.xen
dc.identifier.doi10.1046/j.1365-8711.2003.06486.x
dc.identifier.endpage1238
dc.identifier.issn0035-8711
dc.identifier.issued4
dc.identifier.journaltitleMonthly Notices of the Royal Astronomical Societyen
dc.identifier.startpage1231
dc.identifier.urihttps://hdl.handle.net/10468/4988
dc.identifier.volume341
dc.language.isoenen
dc.publisherOxford University Pressen
dc.relation.urihttps://academic.oup.com/mnras/article-lookup/doi/10.1046/j.1365-8711.2003.06486.x
dc.rights© 2003, Royal Astronomical Societyen
dc.subjectAccretionen
dc.subjectAccretion discsen
dc.subjectCloseen
dc.subjectStarsen
dc.subjectIndividualen
dc.subjectAC211en
dc.subjectX2127+119en
dc.subjectX-raysen
dc.subjectBinariesen
dc.titleTime-resolved spectroscopy of the M15 X-ray binary AC211/X2127+119en
dc.typeArticle (peer-reviewed)en
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