Investigation of stellar magnetic activity using variational autoencoder based on low-resolution spectroscopic survey. (arXiv:2206.07257v2 [astro-ph.SR] CROSS LISTED)

We apply the variational autoencoder (VAE) to the LAMOST-K2 low-resolution
spectra to detect the magnetic activity of the stars in the K2 field. After the
training on the spectra of the selected inactive stars, the VAE model can
efficiently generate the synthetic reference templates needed by the spectral
subtraction procedure, without knowing any stellar parameters. Then we detect
the peculiar spectral features, such as chromospheric emissions, strong nebular
emissions and lithium absorptions, in our sample. We measure the emissions of …

arxiv astro autoencoder investigation survey