Quiescent and Active States of V1413 Aql I: Photometric Activity Criterion and the Detection of a Secondary Minimumстатья
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Дата последнего поиска статьи во внешних источниках: 22 февраля 2019 г.
Аннотация:We present the results of our photometric UBVJHKL observations for the symbiotic star V1413 Aql obtained in 2012 – 2018. An analysis of the data has shown that in May 2017 the system passed to a quiescent state with B−V≈0m.6 for the first time since 1993. It lasted no more than five months. The J−K color at the primary minimum of 2012 reached 1m.5, which, given the interstellar reddening, corresponds to spectral type M5-M6 III of the cool component. A secondary minimum has been detected at φ≈0.5 on the JK phase light curves constructed for the dates of observations with B≥13.