The X-shooter Spectral Library (XSL): Data Release 3
Kristiina Verro, S. C. Trager, R. F. Peletier, A. Lan\c{c}on, A., Gonneau, A. Vazdekis, P. Prugniel, Y.-P. Chen, P. R. T. Coelho, P., S\'anchez-Bl\'azquez, L. Martins, A. Arentsen, M. Lyubenova, J., Falc\'on-Barroso, M. Dries

TL;DR
The X-shooter Spectral Library (XSL) Data Release 3 provides a comprehensive, high-resolution spectral collection of 830 stars across a broad wavelength range, improving data quality and coverage for stellar population studies.
Contribution
This release offers combined de-reddened spectra over 350-2480 nm for 830 stars, including new M-dwarf spectra, with detailed comparisons to existing libraries demonstrating high accuracy and consistency.
Findings
Normalized rms deviation below 5% for common spectra
Negligible offsets in synthetic colours compared to other libraries
Excellent agreement with Gaia (BP-RP) colours
Abstract
We present the third data release (DR3) of the X-shooter Spectral Library (XSL). This moderate-to-high resolution, near-ultraviolet-to-near-infrared ( nm, R 10 000) spectral library is composed of 830 stellar spectra of 683 stars. DR3 improves upon the previous data release by providing the combined de-reddened spectra of the three X-shooter segments over the full nm wavelength range. It also includes additional 20 M-dwarf spectra from the ESO archive. We provide detailed comparisons between this library and Gaia EDR3, MILES, NGSL, CaT library, and (E-)IRTF. The normalised rms deviation is better than or 5 for the majority of spectra in common between MILES (144 spectra of 180), NGSL (112116), and (E-)IRTF (5577) libraries. Comparing synthetic colours of those spectra reveals only negligible offsets and small rms scatter, such as the median…
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