Photometric observations of SN 2017egm and peculiar transient AT 2018cowстатья
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Дата последнего поиска статьи во внешних источниках: 11 мая 2022 г.
Аннотация:We present 57 photometric epochs of superluminous SN2017egm in NGC3191, covering the period of 285 days, and 36 epochs of peculiar object AT2018cow, for which observations lasted 69 days. UBVRI photometry was carried out with 7 telescopes at 5 locations,including the 2.5-m telescope at the Caucasus Mountain Observatoryof the Sternberg Astronomical Institute. The light and color curvesof SN2017egm were compared to several well-studiedobjects of similar type.The light curves of SN2017egm show definite undulations:a shoulder at phase 114 days past maximum and a plateaulasting for a phase interval 155-235 days. We determined the basic parameters of the light curves forSN2017egm and AT2018cow: dates and magnitudes of maximum light, rates of decline at different stages of evolution in different bands.