speclib

Tools for working with stellar spectral libraries.

speclib provides a lightweight Python interface for loading, manipulating, and analyzing stellar spectra and model grids. It includes utilities for photometric synthesis, spectral resampling, and SED construction using libraries such as PHOENIX.

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Installation

With Poetry (recommended):

git clone https://github.com/brackham/speclib.git
cd speclib
poetry install

Or with pip:

pip install git+https://github.com/brackham/speclib.git

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Requirements

• Python 3.11 to 3.13
• astropy
• specutils
• synphot

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Example

from speclib import Spectrum, Filter, apply_filter

spec = Spectrum.from_grid(teff=4000, logg=4.5, feh=0.0)
filt = Filter("2MASS J")
flux = apply_filter(spec, filt)

print(f"J-band flux: {flux:.2e}")

Custom library cache location

Downloaded spectral libraries are stored in ~/.speclib/libraries by default. Set the SPECLIB_LIBRARY_PATH environment variable or call speclib.utils.set_library_root("/path/to/cache") to use a different location.

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License

MIT © 2025 Benjamin V. Rackham