最新发现的矮星 Nova 系统 ASAS J002511+1217.2：一种新的 WZ Sagittae 星

类星变体 ASAS J002511+1217.2 在 2004 年 9 月被 All-Sky Automated Survey 发现，随后被 AAVSO 观察者在接下来的两个月内进行密切监测。光学和光谱分析表明，这是一个非常短周期的系统。在超级星内外 during the superoutburst, 5 to 18 days following the ASAS detection, clearly defined superhumps with a period of 0.05687 +/- 0.00001 days (1-sigma) are present. We observe a change in superhump profile similar to the transition to ``late superhumps'' observed in other short-period systems; the superhump period appears to increase slightly for a time before returning to the original value, with the resulting superhump phase offset by approximately half a period. We detect variations with a period of 0.05666 +/- 0.00003 days (1-sigma) during the four-day quiescent phase between the end of the main outburst and the single echo outburst. Weak variations having the original superhump period reappear during the echo and its rapid decline. Time-resolved spectroscopy conducted nearly 30 days after detection and well into the decline yields an orbital period measurement of 82 +/- 5 minutes. Both narrow and broad components are present in the emission line spectra, indicating the presence of multiple emission regions. The weight of the observational evidence suggests that ASAS J002511+1217.2 is a WZ Sge-type dwarf nova, and we discuss how this system fits into the WZ classification scheme.