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Дата последнего поиска статьи во внешних источниках: 1 октября 2025 г.
Аннотация:V1413 Aql is an anomalous classical symbiotic star that has remained in an active state almost continuously. After failing to return to quiescence following the 2020 outburst, it underwent a new flare in 2025. We present an analysis of new photometric and spectroscopic observations, which provide estimates for the binary components at different stages of activity: $L_{\rm cool}=1700$\,L$_\odot$, $R_{\rm cool}=130$\,R$_\odot$; $L_{\rm hot}=800$\,L$_\odot$, $R_{\rm hot}=28$\,R$_\odot$ during minimum; $L_{\rm hot}=7000$\,L$_\odot$, $R_{\rm hot}=64$\,R$_\odot$ at the 2025 maximum. The significant increase in the luminosity of the hot component during the 2025 outburst deviates from the typical behavior observed in classical symbiotic stars, where outbursts are generally attributed to a redistribution of spectral energy rather than intrinsic changes in luminosity.