{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/z-cam-star-py-per-in-su-uma-state","title":"Z Cam star PY Per in SU UMa state?","arxiv_id":"2204.12056","date":"2022-04-26","proceeding":null,"authors":["Taichi Kato"],"abstract":"PY Per has been known as a Z Cam star. Using VSOLJ, VSNET, AAVSO, ASAS-SN and ZTF observations, I found that this object experienced faint states and classified it to be a Z Cam + VY Scl star. Furthermore, the object changed the outburst behavior since 2020 and it has been showing regularly recurring long, bright outbursts with cycles of 110-160 d and short, faint outbursts between them. The 2021 December--2022 January outburst particularly resembled a superoutburst with a gradually fading plateau phase having a duration more than 25 d and two rebrightenings in the fading part. This object has a long orbital period of 0.15468(5) d based on the TESS data and the previous radial-velocity study. The existence of a superoutburst in a system with a long orbital period would be unusual, but not unprecedented. Since the phenomenon may still be ongoing, I draw attention to this object when it emerges from in the morning sky after the solar conjunction.","url_abs":"https://arxiv.org/abs/2204.12056v1","url_pdf":"https://arxiv.org/pdf/2204.12056v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"z-cam-star-py-per-in-su-uma-state","repo_url":"https://github.com/MickaelRigault/ztfquery","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}