Fig. 1.
![Evolutionary tracks of post-AGB phases taken from Miller Bertolami (2016) for initial masses of 1.0 M⊙ (solid lines) and 2.0 M⊙ (dotted lines) with Z = 0.02 (red) and Z = 0.001 (black). The evolutionary track of a post-horizontal-branch star with a core mass of 0.52 M⊙ with [Fe$/$H] = −1.48 taken from Dorman, Rood, and O’Connell (1993) is shown by the dotted (blue) line. The six objects studied in the present work are shown by open circles. (Color online)](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/pasj/72/6/10.1093_pasj_psaa097/3/psaa097fig1.jpeg?Expires=1749724739&Signature=nwdKqWse~4992cKeJvC4bZB38O8ZqIn~LCBHh7HnT-TDiFts5Ra9apCBfjJasNne2L9hqdCagKRptg-vXEiYrXp1RwUcFac7huvYDWzXogJI4yR2b~2TJGrynrECjpBdXIXWFX5X7IbZnUy0Ur7TAYNqqNyPsQt3zqL9Oj43u1OqNiw4ezC3eVQBIlAjz15vcYAKYNCmKZAwDdvm71DxQu3RG6zPdPzw0CZ4qtAC7pweXOexH7rDJBrPNoumqygCTHNMjThl1~kfyBx9n5zPQVLO-wUC3JGvkfs6~1dJ9NnpbLslV6RxZdRFKtQGSIkY3Ip5maex1gLXUZZTHp3ekQ__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Evolutionary tracks of post-AGB phases taken from Miller Bertolami (2016) for initial masses of 1.0 M⊙ (solid lines) and 2.0 M⊙ (dotted lines) with Z = 0.02 (red) and Z = 0.001 (black). The evolutionary track of a post-horizontal-branch star with a core mass of 0.52 M⊙ with [Fe|$/$|H] = −1.48 taken from Dorman, Rood, and O’Connell (1993) is shown by the dotted (blue) line. The six objects studied in the present work are shown by open circles. (Color online)
