The masses of the neutron and donor star in the high mass X-ray binary IGR J18027-2016

Abstract

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. 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. The spectral type of the donor was confirmed as B0-1 I. The radial velocity curve constructed has a semi-amplitude of $23.8\pm 3.1$ km s${}^{-1}$. Combined with other measured system parameters, a dynamically determined neutron star mass of 1.4 $\pm$ 0.2 - 1.6 $\pm$ 0.3 M${}_{\odot }$ is found. The mass range of the B0-B1 I donor was 18.6 $\pm$ 0.8 - 21.8 $\pm$ 2.4 ~M${}_{\odot }$. These lower and upper limits were obtained under the assumption that the system is viewed edge-on (i = 90${}^{\circ }$ with $\beta$ = 0.89) for the lower limit and the donor fills its Roche lobe ($\beta =1$ with i = 73.1${}^{\circ }$) for the upper limit respectively.

5 pages, 4 figures, Accepted for publication in A&A

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• Shapiro delay measurement of a two solar mass neutron star
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• The 1 - 50 keV spectral and timing analysis of IGR J18027-2016: an eclipsing, high mass X-ray binary

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