Long- and short-term variability of the possible nascent planetary nebula IRAS 22568+6141: A late thermal pulse?

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Table 2

Electron temperature and electron density of the ionised gas in IRAS 22568 in the three epochs.

	1988.58^(a)	2021.58	2023.88
T_e [N II]](K)	13 600 ± 1000	l7 300±600	12400±300
T_e [OIII](K)	–^(b)	$38 400_{- 10 500}^{+ 17 000}$ $38\,400_{ - 10\,\,500}^{ + 17\,000}$	–^(c)
N_e [S II]](cm⁻³)	$12 100_{- 8500}^{+}$ $12\,100_{ - 8500}^ +$	10600±2100	$12 900_{- 2900}^{+ 4500}$ $12\,900_{ - 2900}^{ + 4500}$

Notes. ^(a) No reliable upper limit for the electron density could be obtained. ^(b) [O III] emission lines not detected. ^(c) [O III]14363 not detected.

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