发表机构
Yunnan Observatories, Chinese Academy of Sciences; International Centre of Supernovae (ICESUN); Yunnan Key Laboratory of Supernova Research; Key Laboratory for the Structure and Evolution of Celestial Objects, CAS（中国科学院云南天文台; 超新星国际研究中心; 云南省超星研究重点实验室; 中国科学院天体结构与演化重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究对矮新星YZ Cancri的档案与新型低分辨率光谱进行同质化分析，表征其静止与爆发状态下的谱线特征，为未来高分辨率观测提供参考数据集。
AI 中文摘要
YZ Cancri是一颗SU UMa型矮新星，其光谱观测稀疏且异质。我们对其与爆发相关的档案光谱以及七幅新型低分辨率静止光谱进行了同质化分析。我们一致地表征了Balmer、He I、Fe II、O I以及偶发的He II和Bowen特征，并评估了哪些与状态相关的差异得到了稳健支持。我们采用了共同的连续谱归一化和谱线测量程序，测量了等值宽度、积分谱线强度以及选定的谱线轮廓参数，并比较了静止状态与爆发相关状态之间的谱线形态和强度比。由于这些光谱的分辨率适中且不均匀，且未按轨道相位解析，谱线宽度和质心位移仅用作相对诊断指标。与爆发相关的光谱以宽Balmer吸收或复合轮廓为主，而静止光谱则显示出强烈的单峰Balmer和He I发射、反复出现的Fe II λ5169以及微弱的O I λ7772发射。He II λ4686仅在两次静止曝光中检测到，Bowen混合带在一次曝光中检测到。静止Balmer递减相对平缓，而He I比值显示出显著的曝光间离散。测得的Fe II比值未显示出与光学薄参考值存在明确的系统性偏离，尽管谱线混合限制了其解释。这些光谱为YZ Cnc建立了经验性的状态依赖描述，并为未来相位分辨、更高分辨率的光谱观测提供了参考数据集。
英文摘要
YZ Cancri is an SU UMa-type dwarf nova with sparse and heterogeneous optical spectroscopy. We present a homogeneous analysis of archival outburst-related spectra and seven new low-resolution quiescent spectra. We consistently characterize the Balmer, He I, Fe II, O I, and occasional He II and Bowen features, and assess which state-dependent differences are robustly supported. We applied a common continuum-normalization and line-measurement procedure, measuring equivalent widths, integrated line intensities, and selected profile parameters, and comparing line morphologies and intensity ratios between quiescent and outburst-related states. Because the spectra have modest and nonuniform resolving power and are not orbital-phase resolved, profile widths and centroid shifts are used only as relative diagnostics. Outburst-related spectra are dominated by broad Balmer absorption or composite profiles, whereas quiescent spectra show strong single-peaked Balmer and He I emission, recurrent Fe II λ5169, and weak O I λ7772 emission. He II λ4686 is detected in only two quiescent exposures, and the Bowen blend in one. The quiescent Balmer decrement is relatively flat, while the He I ratios show substantial exposure-to-exposure scatter. The measured Fe II ratios show no clear systematic departure from optically thin reference values, although blending limits their interpretation. These spectra establish an empirical state-dependent description of YZ Cnc and provide a reference dataset for future phase-resolved, higher-resolution spectroscopy.
Comments8 pages, 3 figures, accepted by A&A
DOI：10.1051/0004-6361/202661949
