The physical association of planetary nebula NGC 2818 with open cluster NGC 2818A

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Volume 696 (April 2025)

A&A, 696 (2025) A146

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Table 3.

Properties of the identified OC-PNe.

	PN in AL1 ⁽¹⁾		PN in NGC 6067 ⁽²⁾		PN in M37 ⁽³⁾		PN in NGC 2818A

Parameter	PN	Cluster	PN	Cluster	PN	Cluster	PN	Cluster
RA (J2000)	13:15:19	13:15:16	16:13:02	16:13:11	05:52:26.2	05:52:18	09:16:02	09:16:11
Dec (J2000)	−65:55:01	−65:55:16	−54:06:32	−54:13:06	32:37:25	32:33:12	−36:37:39	−36:38:02
Morphology	Bipolar	OC	Bipolar	OC	Bipolar	OC	Bipolar	OC
Physical radius (pc)	0.42		1.27	8.10	1.60	6.72	2.24×0.88 ⁽⁴⁾	3.6
Chemistry	Type I	0.006 ⁽⁵⁾	Type I	0.024 ⁽⁵⁾	Type I	0.016 ⁽⁵⁾	Type I	0.014 ⁽⁵⁾
Age	11 kyr	0.66 Gyr	31 kyr	90 Myr	78 kyr	470 Myr	11 kyr	955 Myr
Ionised mass (M_⊙)	0.23		0.56		0.32		< 0.47
N_e (cm⁻³)	160		< 5		5		< 100
CSPN T_eff (kK)	113		125–190		100		130
CSPN M_init (M_⊙)	2.25 ± 0.13		5.58 $_{- 0.43}^{+ 0.62}$ $_{-0.43}^{+0.62}$		2.78 $_{- 0.10}^{+ 0.12}$ $_{-0.10}^{+0.12}$		2.33 ± 0.10
CSPN M_fin (M_⊙)	0.58 $_{- 0.08}^{+ 0.14}$ $_{-0.08}^{+0.14}$		0.94±0.11		0.63 $_{- 0.04}^{+ 0.03}$ $_{-0.04}^{+0.03}$		0.58 ± 0.01

Notes. (1) From Parker et al. (2011) and Fragkou et al. (2019a). (2) From Fragkou et al. (2019b). (3) From Fragkou et al. (2022). (4) major × minor axis. (5) metallicity Z for Z_⊙ = 0.0152.

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