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dc.contributor.authorRatti, E.
dc.contributor.authorvan Grunsven, T.
dc.contributor.authorTorres, M.
dc.contributor.authorJonker, P.
dc.contributor.authorMiller-Jones, James
dc.contributor.authorHessels, J.
dc.contributor.authorvan Winkel, H.
dc.contributor.authorvan der Sluys, M.
dc.contributor.authorNelemans, G.
dc.date.accessioned2017-01-30T10:47:26Z
dc.date.available2017-01-30T10:47:26Z
dc.date.created2015-03-02T03:44:58Z
dc.date.issued2013
dc.identifier.citationRatti, E. and van Grunsven, T. and Torres, M. and Jonker, P. and Miller-Jones, J. and Hessels, J. and van Winkel, H. et al. 2013. IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive. Monthly Notices of the Royal Astronomical Society: Letters. 431 (1): pp. L10-L14.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/5635
dc.identifier.doi10.1093/mnrasl/sls052
dc.description.abstract

We present phase-resolved spectroscopy and photometry of the optical counterpart to the X-ray binary IGR J19308+0530. Ellipsoidal modulations in the light curve show that the F-type companion star in the system is Roche lobe filling. The optical spectra are dominated by absorption features from the donor star, with ~10–20 per cent disc contribution to the optical continuum. We measure an orbital period of 14.662 ± 0.001 h, a radial velocity semi-amplitude for the companion star of K2 = 91.4 ± 1.4 km s− 1 and a rotational broadening of v sin i = 108.9 ± 0.6 km s− 1. From K2 and v sin i, given that the donor star is filling its Roche lobe, we derive a mass ratio of q = M2/M1 = 1.78 ± 0.04, which is typically considered to be too large for stable Roche lobe overflow. Our observations support an inclination of ~50°. The accretor in IGR J19308+0530 is most likely a white dwarf, although a neutron star cannot entirely be excluded.

dc.publisherWiley-Blackwell Publishing Ltd.
dc.subjectnovae
dc.subjectstars: mass loss
dc.subjectcataclysmic variables
dc.subjectaccretion: accretion discs
dc.subjectX-rays: binaries
dc.subjectstars: individual: IGR J19308+0530
dc.titleIGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive
dc.typeJournal Article
dcterms.source.volume431
dcterms.source.number1
dcterms.source.startPageL10
dcterms.source.endPageL14
dcterms.source.issn1745-3925
dcterms.source.titleMonthly Notices of the Royal Astronomical Society: Letters
curtin.note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

curtin.departmentCurtin Institute of Radio Astronomy (Physics)
curtin.accessStatusOpen access


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