The 1996-1997 Fading of V651 Mon, the Binary Central Star of the Planetary Nebula NGC 2346

Details The 1996-1997 Fading of V651 Mon, the Binary Central Star of the Planetary Nebula NGC 2346 The 1996-1997 Fading of V651 Mon, the Binary Central Star of the Planetary Nebula NGC 2346

2001-12-13

arxiv.org/abs/astro-ph/0112304v1

PASJ 53, 901-903 (2001)

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures (using a non-standard style file)

Scientific paper

V651 Mon is the binary central star of the bipolar planetary nebula NGC 2346. The star showed the second-ever deep fading in 1996-1997, which was presumably caused by obscuration by a dust cloud in the planetary nebula, as was proposed to explain the 1981-1985 event. The entire duration of the 1996-1997 event was \~400 d, remarkably shorter than the 1981-1985 event, suggesting that the obscuring body was smaller or had a larger tangential velocity. The most remarkable feature in this event was the presence of a sharply defined transient clearing (brightening). From the time-scale of the variation, we propose an upper limit of the projected scale of several times ~10^11 cm of the structure responsible for the brightening. This observation provides the first evidence for a sharply defined, small lucent structure within the obscuring body around the central star of NGC 2346

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