Spectroscopic survey of faint planetary-nebula nuclei - VI. Seventeen hydrogen-rich central stars

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Table 3.

Spectral types, atmospheric parameters, and Kiel masses of our 17 H-rich CSPNe.

Name	Spectral type	T_eff [kK]	log g	log(He/H)	M [M_⊙]	Remarks
Abell 6	DAO	86.9 ± 6.8	6.90 ± 0.12	−1.35 ± 0.13	0.50 ± 0.04
Abell 16	DAO	83.4 ± 1.5	7.27 ± 0.06	−1.60 ± 0.06	0.54 ± 0.02
Abell 24	DA	109.2 ± 1.0	7.70 ± 0.03	…	0.66 ± 0.03	⁽¹⁾
Abell 28	DA	63.8 ± 0.4	7.76 ± 0.02	…	0.61 ± 0.02	⁽¹⁾
Abell 62	DAO	89.1 ± 1.7	7.46 ± 0.05	−1.75 ± 0.06	0.58 ± 0.03
Alv 1	O(H)	≈170.0	≈6.55	≈ − 0.71	≈0.62	⁽²⁾
Fe 4	O(H)	75.7 ± 2.2	5.25 ± 0.02	−1.37 ± 0.04	0.51 ± 0.02
Kn 2	O(H)	85.7 ± 2.4	5.33 ± 0.04	−1.03 ± 0.06	0.55 ± 0.04
Kn 40	O(H)	95.2 ± 2.1	5.71 ± 0.02	−1.36 ± 0.04	0.53 ± 0.05
Kn 45	DAO	90.2 ± 2.3	6.86 ± 0.06	−1.55 ± 0.07	0.50 ± 0.02
Pa 3	sdOB	37.2 ± 0.1	6.11 ± 0.01	−1.56 ± 0.02	≈0.48	⁽³⁾
Pa 12	O(H)	65.0 ± 5.8	5.12 ± 0.07	−1.44 ± 0.08	0.45 ± 0.04	⁽⁴⁾
Pa 15	O(H)	≈100.0	≈5.18	≈ − 1.05	≈0.67	⁽²,⁴⁾
Pa 26	O(H)	94.1 ± 3.6	5.16 ± 0.02	−1.01 ± 0.04	0.63 ± 0.04	⁽⁴⁾
Pa 41	O(H)	136.6 ± 6.6	5.95 ± 0.02	−0.78 ± 0.04	0.61 ± 0.04
Pa 157	O(H)	91.0 ± 0.9	5.44 ± 0.01	−1.07 ± 0.02	0.55 ± 0.02
Pre 8	O(H)	130.0 ± 9.6	6.44 ± 0.07	−0.80 ± 0.10	0.55 ± 0.05

Notes.

⁽¹⁾

Pure H atmosphere;

⁽²⁾

Parameters uncertain due to star lying near border of theoretical grid;

⁽³⁾

sdOstar2020 grid used for analysis (see text);

⁽⁴⁾

Hα not included in fit due to oversubtraction of PN emission (see text). The helium abundances are given as logarithmic number ratios relative to H.

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