Am and Ap star candidates from LAMOST DR10

Existing samples of Am and Ap stars, mostly obtained from spectral data with a signal-to-noise ratio in the g band (S/Ng) greater than 50, can benefit from expansion by exploring spectra with lower S/Ng. Therefore, this paper proposes an ensemble regression model applicable to spectra with a minimum S/Ng of 30.

Using the model, we identify 21361 Am candidates, of which 11614 are new, and 6182 Ap candidates, of which 4978 are new, from LAMOST DR10. The Am sample size has increased by 60% and the Ap sample size has increased by 180% compared to the previous sample. In terms of effective temperature (Teff), the Am candidates range mainly from 6000 to 8500K, while the Ap candidates range from 6000 to 11700K.