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• W2023342065 endingPage "107" @default.
• W2023342065 startingPage "107" @default.
• W2023342065 abstract "The dwarf nova Z Camelopardalis is surrounded by the largest known classical nova shell. This shell demonstrates that at least some dwarf novae must have undergone classical nova eruptions in the past, and that at least some classical novae become dwarf novae long after their nova thermonuclear outbursts. The current size of the shell, its known distance, and the largest observed nova ejection velocity set a lower limit to the time since Z Cam's last outburst of 220 years. The radius of the brightest part of Z Cam's shell is currently ∼880 arcsec. No expansion of the radius of the brightest part of the ejecta was detected, with an upper limit of ⩽0.17 arcsec yr−1. This suggests that the last Z Cam eruption occurred ⩾5000 years ago. However, including the important effect of deceleration as the ejecta sweeps up interstellar matter in its snowplow phase reduces the lower limit to 1300 years. This is the first strong test of the prediction of nova thermonuclear runaway theory that the interoutburst times of classical novae are longer than 1000 years. The intriguing suggestion that Z Cam was a bright nova, recorded by Chinese imperial astrologers in October–November 77 b.c.e., is consistent with our measurements. If Z Cam was indeed the nova of 77 b.c.e. we predict that its ejecta are currently expanding at 85 km s−1, or 0.11 arcsec yr−1. Detection and measurement of this rate of expansion should be possible in just a few years." @default.
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• W2023342065 date "2012-08-21" @default.
• W2023342065 modified "2023-10-18" @default.
• W2023342065 title "THE INTER-ERUPTION TIMESCALE OF CLASSICAL NOVAE FROM EXPANSION OF THE Z CAMELOPARDALIS SHELL" @default.
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• W2023342065 doi "https://doi.org/10.1088/0004-637x/756/2/107" @default.
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