The spectrum of FG Sagittae during the dimming episode in 1992статья
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Аннотация:During the first profound dimming of the star FG Sge in 1992, its low-resolution (2.7 Angstrom pixel(-1)) spectrum showed broad emission components of Na I D and, probably, He I lambda 5876. It may be that the absorption spectrum experienced a short-term self-reversal on the descent to minimum light. The spectrophotometric temperature of the star was estimated to be 6300 K on September 27, 1992. In September 1994, when FG Sge dimmed for the second time, its spectrum again exhibited the Na I and lambda 5876 emission components.