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Find information, examples, FAQs and extensive descriptions of the data, curated by the survey teams.

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The Galactic Archaeology with HERMES survey is collecting stellar parameters and abundances for one million stars in the Milky Way. GALAH yields a comprehensive view of the formation & evolution of the Galaxy.
April 18, 2018 by S. Martell
Oct. 11, 2020, 2:52 p.m. J. Simpson

Value-Added Catalogues


Median spectra

In GALAH, we determine radial velocity in two ways: through cross-correlation against a grid of synthetic spectra, and through cross-correlation against median GALAH spectra constructed for small well-populated regions in Teff - log(g) - [Fe/H] space.

The median spectra are a high-quality empirical spectral library for stars in well-populated regions of the H-R diagram, in bins with width 50 K in Teff, 0.2 dex in log(g) and 0.1 dex in [Fe/H]. There are 1277 such median spectra, composed of between 103 and 2276 individual GALAH spectra. A file containing all of the median spectra can be downloaded from this link.

A paper describing the median spectra and the RV determination is available on arXiv.

April 18, 2018 by S. Martell
Oct. 11, 2020, 2:52 p.m. J. Simpson