In addition to the primary SDSS photometry and spectroscopy, there are a few extra catalogs created by our collaborators that are distributed through the SAS. These Value-Added Catalogs (VACs) are listed below, and include catalogs that were released in earlier data releases.
APOGEE Net: a unified spectral model
Predicted stellar parameters for APOGEE spectra derived with a convolutional neural network.
This catalog contains the predicted stellar parameters (effective temperature, surface gravity, metallicity) for the APOGEE spectra. The parameters are derived using APOGEE Net (Olney et al. 2020, Sprague et al., in prep). APOGEE Net is a convolutional neural network, which has been calibrated to operate on all stars, including those for which the parameters have been challenging to derive by other means (e.g., M dwarfs, pre-main sequence stars, and OB stars). The catalog contains a unique entry for each APOGEE ID; in cases where multiple observations of the same source exist in several apStar files, only the one with the highest signal-to-noise ratio (SNR) is reported.
Catalog last modified: 2021-12-06 07:47:05