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Table 3.
Model priors.
| Parameter | Prior distribution | Notes |
|---|---|---|
| R0 | R0 ∼ 𝒩(3.1, 0.2) | Gaussian on standard value; Fitzpatrick (1999) |
| A0/mag | A0 ∼ exp(−|A0|) × 𝒰[−0.1, 20] | Exponential over [ − 0.1, 20] mag interval |
| μ/mag | μ ∼ 𝒰[−5, 19] | Uniform distance modulus from 1 pc to 60 kpc |
| ( * )[Fe/H]/dex | [Fe/H] ∼ 𝒰[−2, 0.2]×𝒩(μA, σA) | Age-dependent Gaussian over model range |
| μA = 0; σA = 0.25 | if log10(A/yr) < 9 | |
| μA = −3log10(A);σA = 0.5log10(A)+0.25 | if log10(A/yr)≥9 | |
| Teff/K log(L/L⊙) | Teff, log(L)∼𝒰[HRD] | Uniform in the region covered by isochrones |
| log10(A/yr) | 𝒰[6, 13] | Uniform log-age over the isochrone range |
| ( * *)M/M⊙ | M ∼ IMF(0.01, 120 M⊙) | Kroupa (2001) initial mass function. |
| log10(η/mag) | η ∼ 𝒩+(0, 0.01)×𝒰[0, 0.3] | Half-Gaussian truncated at 0.3 mag. |
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