标题： 矮新星BG Arietis中的超级跳动和掠过食 显示英文标题

标题： Superhumps and grazing eclipses in the dwarf nova BG Arietis

摘要： 我们报告了BG Arietis (= SDSS J015151.87+140047.2)在2009年和2010年的未过滤测光数据，显示存在超振幅，峰峰值振幅高达0.36星等，表明这是一颗SU UMa型矮新星。爆发振幅比平均休眠星等19.9高5.1星等。2010年的事件持续至少20天，在此期间我们观察到一个前导爆发，紧接着是一个超爆发。在超爆发上升阶段观察到了调制，其周期约为轨道周期的一半。在平台阶段的平均超振幅周期为Psh = 0.0849(6)天，表示超振幅周期过剩epsilon = 0.030(7)。我们还观察到了深度为0.06至0.13星等，FWHM持续时间约为12分钟（{\Delta }{\Phi } 1/2 = 0.10）的小食，我们认为这是吸积盘的擦边食。2009年的超爆发观测较少，尤其是在早期阶段，因此无法确定是否有前导爆发。在平台阶段的平均超振幅周期为Psh = 0.0851(4)天，但在平台结束时突然下降至Psh = 0.0845(11)天。也观察到了小食。 显示英文摘要

摘要： We report unfiltered photometry of BG Arietis (= SDSS J015151.87+140047.2) in 2009 and 2010 which shows the presence of superhumps with peak-to-peak amplitude of up to 0.36 magnitudes showing this to be an SU UMa type dwarf nova. The outburst amplitude was 5.1 magnitudes above a mean quiescence magnitude of 19.9. The 2010 event lasted at least 20 days during which we observed a precursor outburst which was immediately followed by a superoutburst. Modulations were observed during the rise to superoutburst with a period approximately half Porb. The mean superhump period during the plateau phase was Psh = 0.0849(6) d, representing a superhump period excess epsilon = 0.030(7). We also observed small eclipses of depth 0.06 to 0.13 magnitude and FWHM duration of ~12 mins ({\Delta}{\Phi}1/2 = 0.10), which we interpret as grazing eclipses of the accretion disc. The 2009 superoutburst was less well observed, especially in the early stages, so we cannot tell whether there was a precursor outburst. The mean superhump period during the plateau was Psh = 0.0851(4) d, but towards the end of the plateau it suddenly decreased to Psh = 0.0845(11) d. Small eclipses were also observed.