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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29388
Title: Measuring masses in low mass X-ray binaries via X-ray spectroscopy: the case of MXB 1659-298
Authors: PONTI, GABRIELE 
BIANCHI, STEFANO
Muñoz-Darias, Teo
Nandra, Kirpal
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS 
Number: 481
Issue: 1
First Page: L94
Abstract: 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<SUB>1</SUB> = 89 ± 19 km s<SUP>-1</SUP>, constrained the mass of the secondary (0.3 M<SUB>☉</SUB> ≤ M<SUB>2</SUB> ≤ 0.8 M<SUB>☉</SUB>) and the orbital inclination of the binary system (73°≤ i≤77°). 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.
URI: http://hdl.handle.net/20.500.12386/29388
URL: https://academic.oup.com/mnrasl/article/481/1/L94/5046462?login=true
ISSN: 1745-3925
DOI: 10.1093/mnrasl/sly120
Bibcode ADS: 2018MNRAS.481L..94P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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