发表机构
Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V.; American Association of Variable Star Observers (AAVSO); Department of Physics and Astronomy, University of Sussex（德国变星工作组; 美国变星观测者协会; 萨塞克斯大学物理与天文学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过ZTF测光数据发现ZTF J191814.28+010850.2具有深食、短周期和不规则变化，提出其为SW Sextantis群激变变星候选体，需光谱验证。
AI 中文摘要
我们对 ZTF J191814.28+010850.2 进行了测光研究，该天体是一颗短周期变星，先前被归类为 EA 型食双星。分析基于 ZTF 在 g 和 r 波段的观测数据，以及另外两个夜晚获得的时序 CCD 测光数据。我们推导出食周期为 0.1408529(3) 天。相位折叠后的 ZTF 光变曲线显示出深的主食，g 波段食深约为 2.8 星等，r 波段约为 2.0 星等，并且存在食外周期循环变化的迹象。在排除主食并考虑剩余轨道调制后，稳健的局部加权拟合揭示了两个波段中宽泛的非线性长期亮度变化，g 波段峰峰值范围约为 0.56 星等，r 波段约为 0.46 星等。深食、短轨道周期和不规则变化表明该天体是一个激变变星候选体，并且可能是 SW Sextantis 星群的成员。需要时间分辨光谱来确认或反驳所提出的分类，并检验其是否可能属于 SW Sex 类。
英文摘要
We present a photometric study of ZTF J191814.28+010850.2, a short-period variable previously classified as an EA-type eclipsing binary. The analysis is based on ZTF observations in the g and r bands and additional time-series CCD photometry obtained on two nights. We derive an eclipse period of 0.1408529(3) d. The phased ZTF light curves show a deep primary eclipse, with an eclipse depth of about 2.8 mag in g and 2.0 mag in r, as well as indications of cycle-to-cycle variations outside eclipse. After excluding the primary eclipse and accounting for the remaining orbital modulation, robust locally weighted fits reveal a broad non-linear long-term brightness variation in both bands, with peak-to-peak ranges of about 0.56 mag in g and 0.46 mag in r. The deep eclipse, short orbital period and irregular variability suggest that the object is a cataclysmic-variable candidate and possibly a member of the SW Sextantis group. Time-resolved spectroscopy is required to confirm or refute the proposed classification and to test possible membership in the SW Sex class.
Comments7 pages, 4 figures. Published in BAV Journal No. 114 (2026)
Journal refBAV Journal, No. 114, 2026
