Measuring masses in low mass X-ray binaries via X-ray spectroscopy: the case of MXB 1659-298

被引:11
作者
Ponti, Gabriele [1 ]
Bianchi, Stefano [2 ]
Munoz-Darias, Teo [3 ,4 ]
Nandra, Kirpal [1 ]
机构
[1] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany
[2] Univ Roma Tre, Dipartimento Matemat & Fis, Via Vasca Navale 84, I-00146 Rome, Italy
[3] Inst Astrofis Canarias, E-38205 Tenerife, Spain
[4] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
关键词
techniques: spectroscopic; neutro star physics; accretion; accretion discs; methods: observational; absorption lines; X-rays: binaries; NEUTRON-STAR; DISCOVERY; EMISSION; PERIOD; ECLIPSES; STELLAR; LINES;
D O I
10.1093/mnrasl/sly120
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The determination of fundamental parameters in low-mass X-ray binaries (LMXBs) typically relies on measuring the radial velocity curve of the companion star through optical or near-infrared spectroscopy. It was recently suggested that high resolution X-ray spectroscopy might enable a measurement of the radial velocity curve of the compact object by monitoring the Doppler shifts induced by the orbital motion of the disc wind or the disc atmosphere. We analysed a Chandra-HETG+NuSTAR soft state observation of MXB 1659-298, an eclipsing neutron star LMXB. We measured a radial velocity curve whose phase offset and semi-amplitude are consistent with the primary star. We derived the value for the semi-amplitude of the radial velocity for the compact object K-1 = 89 +/- 19 km s(-1), constrained the mass of the secondary (0.3 M-circle dot < M-2 < 0.8 M-circle dot) and the orbital inclination of the binary system (73 degrees <= i <= 77 degrees). These values are consistent with previous estimates from independent methods. Via the same technique, the next generation of X-ray observatories equipped with high spectral resolution instruments (e.g. Athena) will have the potential to measure the radial velocity curve of the primary in high inclination X-ray binaries to an accuracy of a few per cent.
引用
收藏
页码:L94 / L99
页数:6
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