Volume 577, May 2015
|Number of page(s)||16|
|Published online||18 May 2015|
Ephemeris, orbital decay, and masses of ten eclipsing high-mass X-ray binaries⋆
1 International Space Science Institute Hallerstrasse 6 3012 Bern Switzerland
2 International Space Science Institute Beijing, No.1 Nanertiao, Zhongguancun, Haidian District, 100190 Beijing, PR China
3 ISDC Data Centre for Astrophysics, Chemin d’Écogia 16, 1290 Versoix, Switzerland
4 Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997 Moscow, Russia
5 Service dAstrophysique (SAp), IRFU/DSM/CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
6 Universitätssternwarte der Ludwig-Maximilians-Universität München, Scheinerstrasse 1, 81679 München, Germany
Received: 20 October 2014
Accepted: 25 February 2015
We update the ephemeris of the eclipsing high-mass X-ray binary (HMXB) systems LMC X-4, Cen X-3, 4U 1700-377, 4U 1538-522, SMC X-1, IGR J18027-2016, Vela X-1,IGR J17252-3616, XTE J1855-026, and OAO 1657-415 with the help of more than ten years of monitoring these sources with the All Sky Monitor onboard RXTE and with the Integral Soft Gamma-Ray Imager onboard INTEGRAL. These results are used to refine previous measurements of the orbital period decay of all sources (where available) and provide the first accurate values of the apsidal advance in Vela X-1 and 4U 1538-522. Updated values for the masses of the neutron stars hosted in the ten HMXBs are also provided, as well as the long-term light curves folded on the best determined orbital parameters of the sources. These light curves reveal complex eclipse ingresses and egresses that are understood mostly as being caused by accretion wakes. Our results constitute a database to be used for population and evolutionary studies of HMXBs and for theoretical modeling of long-term accretion in wind-fed X-ray binaries.
Key words: stars: neutron / binaries: eclipsing / X-rays: binaries / pulsars: general
Appendix A is available in electronic form at http://www.aanda.org
© ESO, 2015
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