标题： VSX J074727.6+065050：小犬座中的新WZ天鹰座星 显示英文标题

标题： VSX J074727.6+065050: a new WZ Sagittae star in Canis minor

摘要： 我们展示了矮新星 VSX J074727.6+065050 在2008年1月和2月首次报道的超级爆发的测光数据。这颗恒星在其最亮时达到11.4等，随后以每天0.09等的速度缓慢下降了19天，对应于平台期阶段。接着它迅速下降到16.6等，在此亮度停留了2到3天后，出现了六个显著的回声爆发，之后恒星逐渐变暗回到约19.5等的平静状态。整个爆发幅度至少为8个星等，并持续超过80天。在平台期阶段，我们观测到了常见的超长周期现象，周期为Psh = 0.06070(6) 天，但当平台期结束和快速下降开始时，周期增加至Psh = 0.06151(5) 天。这相当于连续的周期变化，P^dot = +4.4(9) x 10^-5。在回声爆发期间，存在一个超长周期模式，周期为Psh = 0.06088(49) 天。有证据表明该恒星属于矮新星WZ Sge家族。 显示英文摘要

摘要： We present photometry of the first reported superoutburst of the dwarf nova VSX J074727.6+065050 during 2008 January and February. At its brightest the star reached magnitude 11.4 and this was followed by a slow decline at 0.09 mag/d for 19 days, corresponding to the plateau phase. There was then a rapid decline at 1.66 mag/d to a temporary minimum at magnitude 16.6 where it stayed for 2 to 3 days after which there were six remarkable echo outbursts before the star gradually faded back towards quiescence at ~magnitude 19.5. The overall outburst amplitude was at least 8 magnitudes and it lasted more than 80 days. During the plateau phase we observed common superhumps with Psh = 0.06070(6) d, but the period increased to Psh = 0.06151(5) d coinciding with the end of the plateau phase and the onset of the rapid decline. This corresponds to a continuous period change with P^dot = +4.4(9) x 10-5. During the echo outbursts there was a superhump regime with Psh = 0.06088(49) d. Evidence is presented which is consistent with the star being a member of the WZ Sge family of dwarf novae.