The masses of the neutron and donor star in the high-mass X-ray binary IGR J18027-2016
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Título: | The masses of the neutron and donor star in the high-mass X-ray binary IGR J18027-2016 |
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Autor/es: | Mason, Andrew B. | Norton, Andrew J. | Clark, J. Simon | Negueruela, Ignacio | Roche, Paul |
Grupo/s de investigación o GITE: | Astrofísica Estelar (AE) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal |
Palabras clave: | X-rays: binaries | Binaries: eclipsing | Stars: neutron | Binaries: general | Stars: individual: IGR J18027-2016 | Stars: massive |
Área/s de conocimiento: | Astronomía y Astrofísica |
Fecha de publicación: | 4-ago-2011 |
Editor: | EDP Sciences |
Cita bibliográfica: | Astronomy & Astrophysics. 2011, 532: A124. doi:10.1051/0004-6361/201117392 |
Resumen: | 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-1. Combined with other measured system parameters, a dynamically determined neutron star mass of 1.4 ± 0.2–1.6 ± 0.3 M⊙ is found. The mass range of the B0-B1 I donor was 18.6 ± 0.8–21.8 ± 2.4 M⊙. 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. |
Patrocinador/es: | A.B.M. acknowledges support from an STFC studentship. J.S.C. acknowledges support from an RCUK fellowship. This research is partially supported by grants AYA2008-06166-C03-03 and Consolider-GTC CSD-2006-00070 from the Spanish Ministerio de Ciencia e Innovación (MICINN). |
URI: | http://hdl.handle.net/10045/33801 |
ISSN: | 0004-6361 (Print) | 1432-0746 (Online) |
DOI: | 10.1051/0004-6361/201117392 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © ESO, 2011 |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1051/0004-6361/201117392 |
Aparece en las colecciones: | INV - Astrofísica Estelar - Artículos de Revistas |
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2011_Mason_etal_A&A.pdf | 398,54 kB | Adobe PDF | Abrir Vista previa | |
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