**Table 2:** Optical emission line fluxes in units of $\rm 10^{-13}~ erg~s^{-1}~cm^{-2}$ , [TiO]₁ molecular index and $V_{\rm sp}$ magnitudes.
JD¹	-55	590	1065/70	1325	1422/4	1755/7	1791	1826/8	2018	2060	2133/5	2390	2528/32
$\phi$	0.428	0.563	0.402	0.856	0.029	0.614	0.677	0.738	0.075	0.150	0.279	0.730	0.976
H $\gamma$ 4340	9.5	18.5	14.3		1.9	10.5	13.0	18.9	4.1		7.2		3.3
[O III] 4363	0.4	2.2	0.1		1.8	3.8	4.7	3.7	2.3		2.6		1.1
He I 4388	1.0	2.1	1.2		0.1	1.0	1.9	1.0	0.2		0.6
He I 4471	1.0	4.5	2.6		...	1.2	1.7	1.2	0.5		0.4		0.5
He II 4541	0.6	...	...		...	0.6	1.5	0.9	0.5		0.5		0.4
Fe II 4584	0.4		...	...	0.8	0.3	0.6	0.3	...		0.2	...	...
Fe II 4629	...		0.6	0.1	0.2	0.2	0.5	0.3	...		0.1	...	...
N III 4634	0.3	...	...	0.2	0.7	1.6	0.8	...	...		...	...	...
N III 4641	0.6	...	...	...	...	2.1	4.4	1.7	0.3		0.4		0.2
He II 4686	14.0	0.9	0.1	8.5	3.4	18.3	31.7	21.3	11.5		17.1		7.1
H $\beta$ 4861	25.1	42.7	41.4	25.0	5.5	29.7	36.5	39.2	9.4		22.7	19.0	7.2
He I 4922	3.2	2.9	1.6	2.2	0.3	3.0	3.8	2.5	0.5		1.7	1.0	0.2
Fe II 4924	0.3		1.1	0.1	...	0.3	0.7	0.2	0.1		...	...
[O III] 4959	...		...	3.2	1.4	2.4	2.2	1.1	0.6		0.8	0.2	0.4
[O III] 5007	0.2	3.3	1.4	9.7	3.7	7.5	5.0	3.7	1.9		2.3	0.9	1.0
He I 5016	1.7	3.6	2.8	2.2	0.4	1.6	2.0	1.2	0.5		0.8	0.4	0.3
Fe II 5018	0.7		1.1	0.2	0.2	0.6	1.1	0.6	0.1		0.2	0.2	...
He I 5047	0.6	...	0.8	9.6	...	0.3	1.4	1.1	...		...	0.3	...
He II 5411	1.3	...	...	0.3	0.2	1.6	3.9	1.8	1.0		1.4	1.3	0.7
[Fe VII] 5720	0.6	...	...	...	...	0.4	0.6	0.8	1.2	1.2	1.3	1.8	1.4
He I 5876	6.1	10.7	9.4	10.3	2.4	6.1	8.2	8.7	2.6	1.7	4.0	2.2	2.8
[Fe VII] 6087	0.9	...	...	...	0.3	0.7	1.1	1.1	2.0	2.3	2.8	2.9	2.2
H $\alpha$ 6563	127	207	180	192	43.0	118	208	187	51.0	58.7	105	84	44.9
H $\alpha$ CA³	...		64	38	42	25	38	51	11	7.1	5.3	...	6.2
He I 6678	13.1	5.4	4.2	6.1	1.5	8.7	9.0	8.7	2.4	1.7	3.2	2.5	0.7
O VI 6825	2.7	...	...	...	...	...	...	2.5:	...	0.5:	2.3:	2.4	1.1
He I 7065	6.6	5.5	4.9	10.2	2.3	6.6	8.5	10.1	3.8	1.9	3.9	2.2	2.7
He I 7281	2.5	1.3	0.8	1.8	0.3	1.5	2.3	1.6		0.6	0.6	0.9	0.2
[TiO]₁	0.27	0.075	0.21	0.30	0.71	0.45		0.46	0.64	0.35	0.35	0.35	0.34
$V_{\rm sp}$ [mag]	12.5	11.4	11.3²	12.1	13.4	11.7	11.6	12.5	13.2	12.6	12.7	12.7	13.4

¹ Julian Date = 2 450 000 + JD listed in table; ² scaled to $V_{\rm sp} = m_{\rm vis}$ ; ³ central absorption.

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Analysis and discussion
	4 Reddening and distance
	5 The nebula
	6 Hot component
	7 Conclusions
	References
	Online Material