Table 7
O-isotopic abundance ratio, initial stellar mass estimation compared with the central total stellar mass and the total nebula mass.
| Source | 17O/18O | Mi [M⊙] | Mtc [M⊙] | Mneb [M⊙] |
|---|---|---|---|---|
| Red Rectangle | 0.8 | 1.5 | 1.7 | 1.4 × 10−2 |
| 89 Herculis | 0.3 | 1.2 | 1.7 | 1.4 × 10−2 |
Notes. Mi represents the initial stellar mass of the post-AGB component, MTc is of the total central stellar mass, and Mneb is the total mass of the nebula (Keplerian disk and outflow). Values of Mneb, for the Red Rectangle and 89 Her, are taken from Bujarrabal et al. (2016); Gallardo Cava et al. (2021).
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