Mason, A. B.; Norton, A. J.; Clark, S. J.; Negueruela, I. and Roche, P.
(2011).
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| DOI (Digital Object Identifier) Link: | http://dx.doi.org/10.1051/0004-6361/201117392 |
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Abstract
Aims: We report near-infrared observations of the supergiant donor to the eclipsing high mass X-ray binary pulsar IGR J18027-2016. We aim to determine its spectral type and measure its radial velocity curve and hence determine the stellar masses of the components.
Methods: ESO/VLT observations of the donor utilising the NIR spectrograph ISAAC were obtained in the H and K bands. The multi-epoch H band spectra were cross-correlated with RV templates in order to determine a radial solution for the system.
Results: The spectral type of the donor was confirmed as B0-1 I. The radial velocity curve constructed has a semi-amplitude of 23.8 ± 3.1 km/s. Combined with other measured system parameters, a dynamically determined neutron star mass of 1.4 ± 0.2-1.6 ± 0.3 solar masses is found. The mass range of the B0-B1 I donor was 18.6 ± 0.8-21.8 ± 2.4 solar masses. These lower and upper limits were obtained under the assumption that the system is viewed edge-on (i = 90° with β = 0.89) for the lower limit and the donor fills its Roche lobe (β = 1 with i = 73.1°) for the upper limit respectively.
| Item Type: | Journal Article |
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| Copyright Holders: | 2011 ESO |
| ISSN: | 1432-0746 |
| Extra Information: | 5 pp. |
| Keywords: | X-ray binaries; eclipsing binaries; stars; binary stars; IGR J18027-2016; massive stars |
| Academic Unit/Department: | Science > Physical Sciences |
| Interdisciplinary Research Centre: | Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR) |
| Item ID: | 29251 |
| Depositing User: | Andrew Norton |
| Date Deposited: | 15 Aug 2011 08:29 |
| Last Modified: | 20 Feb 2013 08:50 |
| URI: | http://oro.open.ac.uk/id/eprint/29251 |
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