A homogeneous analysis of archival and new low-resolution spectra of YZ Cancri

@misc{dai2026homogeneous,
  title = {{A homogeneous analysis of archival and new low-resolution spectra of YZ Cancri}},
  author = {Zhibin Dai and Lihuan Yu and Jiao Li and Xuefei Chen and Zhanwen Han},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.18646},
  eprint = {2609.18646},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.18646},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - A homogeneous analysis of archival and new low-resolution spectra of YZ Cancri
AU  - Zhibin Dai
AU  - Lihuan Yu
AU  - Jiao Li
AU  - Xuefei Chen
AU  - Zhanwen Han
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2609.18646
UR  - https://arxiv.org/abs/2609.18646
AB  - 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.
ER  -