Properties of central stars of planetary nebulae with distances in Gaia DR2

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Table 1

Mean values of different parameters in three regions of the HR diagram, together with their dispersion values, in brackets.

Parameter	Region 1	Region 2	Region 3
Number of CSs	7	16	31
⟨M⟩ (M_⊙)	0.583 (0.054)	0.587 (0.061)	0.605 (0.064)
⟨R⟩ (pc)	0.093 (0.049)	0.298 (0.202)	0.804 (0.518)
⟨T_evo⟩ (Kyr)	14.2 (18.3)	20.5 (23.6)	33.8 (33.3)
(km s⁻¹)	6.4 (3.4)	14.3 (9.6)	23.2 (15.0)
(km s⁻¹)	20.3 (14.1)	27.4 (5.9)	24.6 (10.0)

Notes. Parameter mean expansion velocity from evolutionaryage and nebular size; mean expansion velocity from emission lines observations. Region 1: > 3.0 and log (T_eff) < 4.8. Region 2: > 3.0 and log (T_eff) > 4.8. Region 3: < 3.0 and log (T_eff) > 4.9.

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