IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive
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...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing Ltd.
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/5635 |
| _version_ | 1848744851882901504 |
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| author | Ratti, E. van Grunsven, T. Torres, M. Jonker, P. Miller-Jones, James Hessels, J. van Winkel, H. van der Sluys, M. Nelemans, G. |
| author_facet | Ratti, E. van Grunsven, T. Torres, M. Jonker, P. Miller-Jones, James Hessels, J. van Winkel, H. van der Sluys, M. Nelemans, G. |
| author_sort | Ratti, E. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T06:08:02Z |
| format | Journal Article |
| id | curtin-20.500.11937-5635 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:08:02Z |
| publishDate | 2013 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-56352017-09-13T14:41:03Z IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive Ratti, E. van Grunsven, T. Torres, M. Jonker, P. Miller-Jones, James Hessels, J. van Winkel, H. van der Sluys, M. Nelemans, G. novae stars: mass loss cataclysmic variables accretion: accretion discs X-rays: binaries stars: individual: IGR J19308+0530 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. 2013 Journal Article http://hdl.handle.net/20.500.11937/5635 10.1093/mnrasl/sls052 Wiley-Blackwell Publishing Ltd. fulltext |
| spellingShingle | novae stars: mass loss cataclysmic variables accretion: accretion discs X-rays: binaries stars: individual: IGR J19308+0530 Ratti, E. van Grunsven, T. Torres, M. Jonker, P. Miller-Jones, James Hessels, J. van Winkel, H. van der Sluys, M. Nelemans, G. IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive |
| title | IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive |
| title_full | IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive |
| title_fullStr | IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive |
| title_full_unstemmed | IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive |
| title_short | IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive |
| title_sort | igr j19308+0530: roche lobe overflow on to a compact object from a donor 1.8 times as massive |
| topic | novae stars: mass loss cataclysmic variables accretion: accretion discs X-rays: binaries stars: individual: IGR J19308+0530 |
| url | http://hdl.handle.net/20.500.11937/5635 |