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Gaia18cjb 之谜：FUor 与 EXor 的罕见混合体？

The Enigma of Gaia18cjb: a Rare Hybrid of FUor and EXor?

Eleonora Fiorellino, Peter Abraham, Agnes Kospal, Maria Kun, Juan M. Alcala, Alessio Caratti o Garatti, Fernando Cruz-Saenz de Miera, David Garcia-Alvarez, Tere… 展开作者

Eleonora Fiorellino, Peter Abraham, Agnes Kospal, Maria Kun, Juan M. Alcala, Alessio Caratti o Garatti, Fernando Cruz-Saenz de Miera, David Garcia-Alvarez, Teresa Giannini, Sunkyung Park, Michal Siwak, Mate Szilagyi, Elvira Covino, Gabor Marton, Zsofia Nagy, Brunella Nisini, Zsofia Marianna Szabo, Zsofia Bora, Borbala Cseh, Csilla Kalup, Mate Krezinger, Levente Kriskovics, Waldemar Ogloza, Andras Pal, Adam Sodor, Eda Sonbas, Robert Szakats, Krisztian Vida, Jozsef Vinko, Lukasz Wyrzykowski, Pawel Zielinski

备注：
21 pages, 13 figures
发表信息：
A&A 686, A160 (2024)
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AI总结：

本文通过多波段测光与近红外光谱研究 Gaia18cjb，发现其兼具 FUor 型长时强增亮和 EXor 型光谱与吸积特征，属于罕见的 FUor/EXor 混合型爆发性年轻恒星。

摘要：

背景。Gaia18cjb 是 Gaia 预警的爆发性年轻恒星候选体之一，在过去 13 年中经历了缓慢而强烈的增亮，类似于一些 FU Orionis 型天体。目标。本工作的目标是确定 Gaia18cjb 的年轻恒星性质，确定其物理和吸积特性，以对其光变进行分类。方法。我们利用多波段光学和近红外测光以及近红外光谱进行了监测观测。我们给出了爆发前和爆发期间光学和红外光变曲线、不同波段的颜色-星等图、近红外谱线的探测，以及爆发期间恒星参数和吸积参数的估计。结果。光学光变曲线显示，在过去 13 年中出现了一次异常漫长（8 年）的 5 星等增亮事件，随后达到平台期，表明爆发仍在进行中，这暗示其具有类似 FUor 的性质。同一次爆发在红外光变曲线中较弱。在爆发期间获得的近红外光谱显示出典型的强吸积中低质量年轻恒星的发射线，具有典型的 EXor 特征。Gaia18cjb 光谱能量分布的光谱指数将其在爆发前阶段归类为 I 类源，在爆发期间归类为平谱年轻恒星天体。结论。Gaia18cjb 是一颗爆发性年轻恒星天体，它同时表现出类似 FUor 的测光特征（就增亮幅度和爆发持续时间而言）和类似 EXor 的光谱特征及吸积率，与 V350 Cep 和 V1647 Ori 类似，后者被归类为介于 FUor 和 EXor 之间的天体。

英文摘要：

Context. Gaia18cjb is one of the Gaia-alerted eruptive young star candidates which has been experiencing a slow and strong brightening during the last 13 years, similar to some FU Orionis-type objects. Aims. The aim of this work is to derive the young stellar nature of Gaia18cjb, determine its physical and accretion properties to classify its variability. Methods. We conducted monitoring observations using multi-filter optical and near-infrared photometry, as well as near-infrared spectroscopy. We present the analysis of pre-outburst and outburst optical and infrared light curves, color-magnitude diagrams in different bands, the detection of near-IR spectral lines, and estimates of both stellar and accretion parameters during the burst. Results. The optical light curve shows an unusually long (8 years) brightening event of 5 mag in the last 13 years, before reaching a plateau indicating that the burst is still on-going, suggesting a FUor-like nature. The same outburst is less strong in the infrared light curves. The near-infrared spectra, obtained during the outburst, exhibit emission lines typical of highly accreting low-intermediate mass young stars with typical EXor features. The spectral index of Gaia18cjb SED classifies it as a Class I in the pre-burst stage and a Flat Spectrum young stellar object (YSO) during the burst. Conclusions. Gaia18cjb is an eruptive YSO which shows FUor-like photometric features (in terms of brightening amplitude and length of the burst) and EXor-like spectroscopic features and accretion rate, as V350 Cep and V1647 Ori, classified as objects in between FUors and EXors

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