Implement [Fe/H] scaling for abundances, closes #272

[tiwariar7]

📝 Description

Type: 🪲 bugfix | 🚀 feature | ☣️ breaking change | 🚦 testing | 📝 documentation | 🎢 infrastructure

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[andrewfullard]

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[tiwariar7]

Pull Request: [Fe/H] Scaling for Abundances

Description

This pull request implements a way to easily scale solar abundances using the [Fe/H] (metallicity) parameter.

Key changes:

• Added a feh parameter to create_scaled_solar_profile in stardis/io/model/util.py to scale heavy metal mass fractions by $10^{\text{[Fe/H]}}$.
• Updated MARCSModel and MESAModel to support passing the feh parameter through their to_stellar_model and composition methods.
• Updated the input_model schema in stardis/io/schemas/input_model.yml to include composition_feh.
• Updated the configuration parser in stardis/io/base.py to pass the new composition_feh setting to the model converters.

This allows users to specify metallicity in the configuration file like so:

input_model:
  composition_source: asplund_2020
  composition_feh: -0.5

closes #272

📌Resources

• Asplund et al. 2009
• Asplund et al. 2021

🚦 Testing

How did you test these changes?

• By Testing pipeline

Specifically, added test_marcs_with_feh_scaling to stardis/io/model/tests/test_model_io.py to verify that feh: -1.0 correctly scales the total metallicity $Z$ by a factor of 0.1.