Spectroscopic survey of faint planetary-nebula nuclei - III. A [WC] central star and two new PG1159 nuclei

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Volume 686 (June 2024)

A&A, 686 (2024) A29

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Table 3

Parameters of the central stars of Abell 25, StDr 138, and RaMul 2.

Parameter	Abell 25	StDr 138	RaMul 2
Spectral type	PG1159/E	PG1159/E	[WC4-5]
T_eff (K)	140 000 ± 10 000	130000 ± 10000	112000 ± 10000
log 𝑔 (cm s⁻²)	6.8 ± 0.3	7.2±0.4	5.8 ± 0.16^(a)
H	≤0.05	≤0.05	≤0.03
He	0.46 ± 0.10	0.50 ± 0.10	0.40 ± 0.10
C	0.46 ± 0.10	0.50 ± 0.10	0.50 ± 0.10
N	≤0.01	≤0.02	${0.02}_{- 0.01}^{+ 0.03}$ ${0.02_{ - 0.01}^{ + 0.03}}$
O	0.08 ± 0.05	≤0.08	${0.05}_{- 0.02}^{+ 0.05}$ ${0.05_{ - 0.02}^{ + 0.05}}$
M (M_⊙)	${0.53}_{- 0.01}^{+ 0.03}$ ${0.53_{ - 0.01}^{ + 0.03}}$	${0.54}_{- 0.02}^{+ 0.09}$ ${0.54_{ - 0.02}^{ + 0.09}}$	0.53 ^(b)
R (R_⊙)	${0.048}_{- 0.014}^{+ 0.022}$ ${0.048_{ - 0.014}^{ + 0.022}}$	${0.031}_{- 0.012}^{+ 0.021}$ ${0.031_{ - 0.012}^{ + 0.021}}$	0.149 ± 0.026
L (L_⊙)	$797_{- 500}^{+ 1438}$ ${797_{ - 500}^{ + 1438}}$	$247_{- 180}^{+ 698}$ ${247_{ - 180}^{ + 698}}$	$3150_{- 1020}^{+ 1200}$ ${3150_{ - 1020}^{ + 1200}}$
R_t (R_⊙)	–	–	${1.45}_{- 0.19}^{+ 3.55}$ ${1.45_{ - 0.19}^{ + 3.55}}$
Ṁ(M_⊙ yr⁻¹)	–	–	(4.2 ± 1.1) × 10⁻⁷
υ_∞ (km s⁻¹)	–	–	1000 ± 100
d_spec (pc)	$4592_{- 1345}^{+ 2109}$ ${4592_{ - 1345}^{ + 2109}}$	$1528_{- 595}^{+ 1038}$ ${1528_{ - 595}^{ + 1038}}$	$8850_{- 780}^{+ 530}$ ${8850_{ - 780}^{ + 530}}$ ^(c)
d_Gaia (pc)	$2423_{- 513}^{+ 983}$ ${2423_{ - 513}^{ + 983}}$	$1056_{- 152}^{+ 237}$ ${1056_{ - 152}^{ + 237}}$	$6386_{- 996}^{+ 1073}$ ${6386_{ - 996}^{ + 1073}}$
E(B − V) (mag)	${0.05}_{- 0.02}^{+ 0.03}$ ${0.05_{ - 0.02}^{ + 0.03}}$	${0.33}_{- 0.02}^{+ 0.03}$ ${0.33_{ - 0.02}^{ + 0.03}}$	${0.46}_{- 0.12}^{+ 0.10}$ ${0.46_{ - 0.12}^{ + 0.10}}$

Notes. Element abundances given in mass fractions. Stellar masses of the PG1159 stars derived from VLTP tracks (Fig. 4). T_eff and R for RaMul 2 defined at τ_Ross = 20. The Gaia distances were taken from Bailer-Jones et al. (2021). ^(a)Computed from R and M. ^(b)From Fig. 6, adopted value for the PoWR model is 0.6 M_⊙. ^(c)Computed from an assumed value for the luminosity of L = 6000 L_⊙.

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