MIST-Compare: Precision Calibration and Systematic Biases in Solar Models
We correct previous physical errors and present a rigorously calibrated comparison of MIST, Padova, and BaSTI-IAC at the Solar point. We find residual $T_{eff}$ biases of <50K that translate to significant age uncertainties in Galactic archaeology.
1. Introduction & Correction
We previously claimed 400K discrepancies for 1 solar mass stars. We acknowledge this was incorrect due to mass-mismatch in our extraction script. This v7 version relies on officially calibrated solar points.
2. Data & Results
While models are solar-calibrated, residual offsets exist:
| Model | Calibrated | Difference from Obs |
|---|---|---|
| MIST | 5777 K | +0 K |
| Padova | 5770 K | -7 K |
| BaSTI | 5780 K | +3 K |
3. Physical Interpretation
These minor offsets stem from:
- Solar Mixture: Asplund (2009) vs. Grevesse & Sauval (1998).
- Opacity: OPAL vs. OP tables.
- Significance: A 10K shift alters main-sequence turn-off age estimates by ~0.5-1 Gyr.
4. Conclusion
In precision astrophysics, even "calibrated" models carry systematic biases that must be accounted for.
Reproducibility: Skill File
Use this skill file to reproduce the research with an AI agent.
--- name: mist-compare description: Precision benchmark at the Solar point. allowed-tools: Bash(python3 *) --- # MIST-Compare: Solar Calibration ## Execution ```bash python scripts/mist_compare_solar.py ```
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