The X-Shooter Spectral Library

The X-Shooter Spectral Library is a stellar spectral library covering the wavelength range 3000–25000 Å, at a resolution R ~ 10 000. The library was built using the medium-resolution spectrograph X-Shooter (ESO, VLT).

The first data release 1 (DR1) contains UVB and VIS spectra for more than 200 stars, while the second data release (DR2) covers the full X-shooter range (UVB to NIR) and contains 813 observations of 666 stars. It also covers most of the HR diagram with spectral types between O and M, as well as AGB stars. Stellar parameters for 754 DR2 spectra are available.

Overview of DR2: 813 observations of 666 stars (from UVB to NIR) [Gonneau et al. (2020), Arentsen et al. (2019)]
Quick access to DR2 data


Figure 1: Distribution of the spectral types present in XSL, as retrieved from SIMBAD. We highlight the number of stars known as long period variable (LPV) objects in purple. The stars in the ‘LPV’ bin have no given spectral type but have object types labelling them as LPV objects. The stars in the blue bin ‘other’ do not have spectral types in SIMBAD, nor have object types which label them as LPV objects.


Figure 2: Stellar atmospheric parameters, calculated by Arentsen et al. (2019) (open symbols) and Gonneau et al. (2017) (star symbols), for 769 XSL spectra.

Overview of DR1: 246 observations of 237 stars (UVB and VIS) [Chen et al. (2014)]
Quick access to DR1 data


Figure 1: Distribution of the spectral types in XSL observed in Periods 84 and 85 (excluding telluric calibrators). Spectral types were retrieved from SIMBAD or based on educated guesses from the source libraries or atmospheric parameters.


Figure 2: HR diagram of the 219 XSL stars (O–M, LPV, S) with calculated Teff, logg, and [Fe/H], where [Fe/H] is presented in different colors.