The Recurrent Nova U Scorpii in the 1999 Outburst: the First Detection of a Significant Orbital-Period Change
作者： Katsura Matsumoto , Taichi Kato , Izumi Hachisu
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摘要: In this paper we present and discuss our time-resolved photometry of an eclipsing recurrent nova, U Sco, during outburst in 1999, which was conducted from immediately after the optical maximum to final fading toward quiescence. first-ever complete light-curve, a few primary secondary eclipses binary system were detected, timings minima determined. We found that showed no totality outburst. The depth 0.4–0.8 mag, much shallower than plateau phase, very little irradiation (≤ 0.1mag) observed orbital light curve, implies existence large flaring rim accretion disk detected at earlier phases for predicted ephemerides. Thus, obtained period change as u P/P= −1.7(±0.7) ×10 −6 yr −1 O −C. Assuming is result conservative mass transfer between component stars, its mass-transfer rate reaches
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