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

Pintore, Fabio; Sanna, Andrea; Gambino, Angelo F. +5 more

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 a more accurate orbital ephemeris and at constraining the orbital period derivative of the system for the first time. In addition, we want to better constrain the distance to the source in order to locate the system in …