Updating the orbital ephemeris of the dipping source XB 1254-690 and the distance to the source

Autor: Fabio Pintore, Alessandro Riggio, Andrea Sanna, Luciano Burderi, M. Matranga, Angelo Gambino, R. Iaria, Tiziana Di Salvo

Publikováno v: NASA Astrophysics Data System

XB 1254-690 is a dipping low mass X-ray binary system hosting a neutron star and showing type I X-ray bursts. We aim at obtaining more accurate orbital ephemeris and at constraining the orbital period derivative of the system for the first time. In a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d74b62c969aefcd1987fa60dadb40f9
http://hdl.handle.net/10447/244704

Evidence of a non-conservative mass transfer for XTE J0929-314

Autor: Andrea Sanna, Angelo Gambino, A. Marino, T. Di Salvo, A. Riggio, Luciano Burderi, M. Matranga, R. Iaria

Context. In 1998 the first accreting millisecond pulsar, SAX J1808.4-3658, was discovered and to date 18 systems showing coherent, high frequency (> 100 Hz) pulsations in low mass X-ray binaries are known. Since their discovery, this class of sources

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::405a1a78a1b21af4e792821758fd61c5
http://hdl.handle.net/20.500.12386/26841

Line intensity enhancements in stellar coronal X-ray spectra due to opacity effects

Autor: M. Matranga, Justin Wark, Mihalis Mathioudakis, S. J. Rose, Francis P. Keenan

Publikováno v: Rose, S J, Matranga, M, Mathioudakis, M, Keenan, F P & Wark, J S 2008, ' Line intensity enhancements in stellar coronal X-ray spectra due to opacity effects ', Astronomy and Astrophysics, vol. 483, pp. 887-890 . https://doi.org/10.1051/0004-6361:20079040

Context. The I(15.01 A)/I(16.78 A) emission line intensity ratio in Fe XVII has been reported to deviate from its theoretical value in solar and stellar X-ray spectra. This is attributed to opacity in the 15.01 A line, leading to a reduction in its i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7310de319e7cacbda74e4f67d82562c2
https://ora.ox.ac.uk/objects/uuid:5d98497e-43d0-45f2-8208-301014f215a7

Timing of the accreting millisecond pulsar SAX J1748.9-2021 during its 2015 outburst

Autor: Alessandro Riggio, Andrea Sanna, T. Di Salvo, F. Scarano, F. Pintore, Angelo Gambino, R. Iaria, Luciano Burderi, M. Matranga

Publikováno v: NASA Astrophysics Data System

We report on the timing analysis of the 2015 outburst of the intermittent accreting millisecond X-ray pulsar SAX J1748.9-2021 observed on March 4 by the X-ray satellite XMM-Newton. By phase-connecting the time of arrivals of the observed pulses, we d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::faa4bb6da9cce21b0190c6063e06e136

Signature of the presence of a third body orbiting around XB 1916-053

Autor: R. Iaria, Luciano Burderi, M. Matranga, A. Riggio, M. Del Santo, A. Sanna, Fabio Pintore, F. Scarano, P. Romano, C. G. Galiano, Angelo Gambino, T. Di Salvo

The ultra-compact dipping source \object{XB 1916-053} has an orbital period of close to 50 min and a companion star with a very low mass (less than 0.1 M$_{\odot}$). The orbital period derivative of the source was estimated to be $1.5(3) \times 10^{-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ca78c50655c53a5fb90026c2992dad9
http://hdl.handle.net/10447/154307