The evolution of planetary nebulae - VI. On the chemical composition of the metal-poor PN G135.9+55.9

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Table 1:

Flux measurements of PN G135.9+55.9.
Emission line	$\lambda_0$ [Å]	PMAS $_{{\rm raw}}$		PMAS $_{{\rm corr.}}$		R02 (SPM1)		R02 (CFHT)		J02^a		T01	$I({\rm case~B})$
[O III]	5006.84	3.36	(0.33)	3.48	(0.35)	2.7	(1.3)	2.87	(0.85)	3	(1)	3.1
[O III]	4958.92	1.27	(0.29)	1.33	(0.30)
$\ensuremath{{\rm H}\beta}$	4861.32	100.00	(0.49)	100.00	(0.49)	100.0	(2.1)	100.0 $\ensuremath{\phantom{0}}$	(1.7)	100		100	100.0
He II	4685.65	78.72	(0.62)	82.11	(0.64)	76.1	(2.3)	78.6 $\ensuremath{\phantom{0}}$	(1.5)	77	(3)	92
He II	4541.59	2.96	(0.39)	3.09	(0.40)
H $\gamma$	4340.45	45.49	(0.60)	45.40	(0.63)	41.0	(1.6)	42.05	(0.98)	39	(3)	56	47.6
He II	4199.83	2.48	(0.59)	2.59	(0.61)
H $\delta$	4101.74	23.81	(0.64)	23.69	(0.66)	21.4	(2.8)	20.6 $\ensuremath{\phantom{0}}$	(1.2)	17	(2)	30	26.6
H7	3970.07	9.70	(0.73)	10.11	(0.76)	10.0	(2.5)	6.11	(0.64)	4	(1)	11	16.4
H8	3889.06	8.63	(0.89)	9.00	(0.93)			2.92	(0.73)				10.8
[Ne III]	3868.80	<1		<1				1.04	(0.52)	15	(7)
H9	3835.40	8.22	(0.99)	8.6 $\ensuremath{\phantom{0}}$	(1.0)								7.5
H10	3797.91	3.4 $\ensuremath{\phantom{0}}$	(1.2)	3.3 $\ensuremath{\phantom{0}}$	(1.2)								5.8
F( $\ensuremath{{\rm H}\beta}$ )^b		1.924	(0.009)			1.82	(0.03)	2.55	(0.03)	1.47		1.19

Notes. Errors are given in parentheses. The emission line names and the rest wavelength $\lambda_0$ , and Case B line ratios for the Balmer lines to $\ensuremath{{\rm H}\beta}$ , are given in Cols. 1, 2, and 9. We present our raw values in Col. 3 and values corrected for the contribution of He II Pickering lines to the Balmer lines in Col. 4. Columns 5-8 give the values presented by R02 (SPM1), R02 (CFHT), J02, and T01, respectively.
^(a) The line ratios are corrected for an extinction value of E(B-V) = 0.03 and for a ${\sim}5\%$ contribution of He II-lines to Balmer lines.
^(b) This is the total flux in emission measured for $\ensuremath{{\rm H}\beta}$ in units of 10^-14 $\ensuremath{{\rm erg}~{\rm cm}^{-2}~{\rm s}^{-1}}$ , systematic errors are not considered in the error estimate.

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