Spectral Evolution of the Unusual Slow Nova V5558 Sgr
作者： Daisaku Nogami , Seiichiro Kiyota , Kazuya Ayani , Kazuhiro Nakajima , Hiroyuki Maehara
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摘要: We report on the spectral evolution of enigmatic, very slow nova V5558 Sgr, based low-resolution spectra obtained at Fujii-Bisei Observatory and Bisei Astronomical Observatory, Japan during a period 2007 April 6 to 2008 May 3. Sgr shows pre-maximum halt then several flare-like rebrightenings, which is similar another V723 Cas. In our observations, type evolved from He/N toward Fe II halt, again. This course transition was observed for first time in long history research. rebrightening stage after initial brightness maximum, we could identify many emission lines accompanied by stronger absorption component P-Cygni profile maxima. found that velocity measured peak decreased Furthermore, compared with Cas, other novae exhibited rebrightenings early phase.
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