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

被引：18

作者：

Mason, A. B. ^{[1
]}

Norton, A. J. ^{[1
]}

Clark, J. S. ^{[1
]}

Negueruela, I. ^{[2
]}

Roche, P. ^{[1
,3
,4
]}

机构：

[1] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England

[2] Univ Alicante, Dept Fis Ingn Sistemas & Teoria Senal, E-03080 Alicante, Spain

[3] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales

[4] Univ Glamorgan, Div Earth Space & Environm, Pontypridd CF37 1DL, M Glam, Wales

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 532卷

关键词：

X-rays: binaries; binaries: eclipsing; stars: neutron; binaries: general; stars: individual: IGR J18027-2016; stars: massive;

D O I：

10.1051/0004-6361/201117392

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 kms(-1). Combined with other measured system parameters, a dynamically determined neutron star mass of 1.4 +/- 0.2-1.6 +/- 0.3 M-circle dot is found. The mass range of the B0-B1 I donor was 18.6 +/- 0.8-21.8 +/- 2.4 M-circle dot. These lower and upper limits were obtained under the assumption that the system is viewed edge-on (i = 90 degrees. with beta = 0.89) for the lower limit and the donor fills its Roche lobe (beta = 1 with i = 73.1 degrees.) for the upper limit respectively.

引用

页数：5

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