Mason, A. B.; Norton, A. J.; Clark, S. J.; Negueruela, I. and Roche, P.
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|DOI (Digital Object Identifier) Link:||http://dx.doi.org/doi:10.1051/0004-6361/201117392|
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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|
|Copyright Holders:||2011 ESO|
|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)|
|Depositing User:||Andrew Norton|
|Date Deposited:||15 Aug 2011 08:29|
|Last Modified:||20 Feb 2013 08:50|
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