The X-shooter Spectral Library (XSL): Data Release 3

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Verro, K. ; Trager, S. C. ; Peletier, R. F. ; Lancon, A. ; Gonneau, A. ; Vazdekis, A. ; Prugniel, P. ; Chen, Y-P ; Coelho, P. R. T. ; Sanchez-Blazquez, P. ; Martins, L. ; Arentsen, A. ; Lyubenova, M. ; Falcon-Barroso, J. ; Dries, M.

• Document type: Journal article
• Source: Astronomy & Astrophysics; v. 660, p. 26-pg., 2022-04-05.

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 (350-2480 nm, R similar to 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 350-2480 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 D = 0.05 or 5% for the majority of spectra in common between MILES (144 spectra of 180), NGSL (112/116), and (E-)IRTF (55/77) libraries. Comparing synthetic colours of those spectra reveals only negligible offsets and small rms scatter, such as the median offset(rms) 0.001 +/- 0.040 mag in the (box1 - box2) colour of the UVB arm, -0.004 +/- 0.028 mag in (box3 - box4) of the VIS arm, and -0.001 +/- 0.045 mag in (box2 - box3) colour between the UVB and VIS arms, when comparing stars in common with MILES. We also find an excellent agreement between the Gaia published (BP - RP) colours and those measured from the XSL DR3 spectra, with a zero median offset and an rms scatter of 0.037 mag for 449 non-variable stars. The unmatched characteristics of this library, which combine a relatively high resolution, a large number of stars, and an extended wavelength coverage, will help us to bridge the gap between the optical and the near-IR studies of intermediate and old stellar populations, and to probe low-mass stellar systems. (AU)

• FAPESP's process: 18/26381-4 - Improving Synthetic Stellar Libraries with Gaia Benchmark Stars
• Grantee: Lucimara Pires Martins
• Support Opportunities: Scholarships abroad - Research
• FAPESP's process: 18/05392-8 - A new library of fully theoretical stellar population models
• Grantee: Paula Rodrigues Teixeira Coelho
• Support Opportunities: Regular Research Grants