Surprising Variability of the Planetary Nebula IC 4997 = QV Sge

23 Feb 2020 Arkhipova V. P. Burlak M. A. Ikonnikova N. P. Komissarova G. V. Esipov V. F. Shenavrin V. I.

We present the results of a new epoch of a long-term photometric monitoring of the variable planetary nebula IC~4997. The integral $UBV$ light curves display a continuing brightening of 0.$^{m}15$ in $V$, a slight rise (<0.$^{m}1$) in $B$, and constancy in $U$... (read more)

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  • SOLAR AND STELLAR ASTROPHYSICS
  • ASTROPHYSICS OF GALAXIES