The X-shooter Spectral Library (XSL): Data release 2

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Gonneau, A. ^{[1, 2, 3]} ; Lyubenova, M. ^{[2, 4]} ; Lancon, A. ^[3] ; Trager, S. C. ^[2] ; Peletier, R. F. ^[2] ; Arentsen, A. ^{[5, 2]} ; Chen, Y. -P. ^[6] ; Coelho, P. R. T. ^[7] ; Dries, M. ^[2] ; Falcon-Barroso, J. ^{[8, 9]} ; Prugniel, P. ^[10] ; Sanchez-Blazquez, P. ^[11] ; Vazdekis, A. ^{[8, 9]} ; Verro, K. ^[2]

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^[1] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA - England

^[2] Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen - Netherlands

^[3] Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, 11 Rue Univ, F-67000 Strasbourg - France

^[4] ESO, Karl Schwarzschild Str 2, D-85748 Garching - Germany

^[5] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam - Germany

^[6] New York Univ Abu Dhabi, POB 129188, Abu Dhabi - U Arab Emirates

^[7] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508090 Sao Paulo - Brazil

^[8] Univ La Laguna, Dept Astrofis, Tenerife 38205 - Spain

^[9] Inst Astrofis Canarias, Via Lactea S-N, Tenerife - Spain

^[10] Univ Lyon, Lyon 1, Observ Lyon, CRAL, CNRS, UMR 5574, Lyon - France

^[11] UCM, Dept Fis Tierra & Astrofis, Madrid 28040 - Spain

• Tipo de documento: Artigo Científico
• Fonte: Astronomy & Astrophysics; v. 634, FEB 25 2020.
• Citações Web of Science: 0

Resumo

We present the second data release (DR2) of the X-shooter Spectral Library (XSL), which contains all the spectra obtained over the six semesters of that program. This release supersedes our first data release from Chen et al. (2014, A\&A, 565, A117), with a larger number of spectra (813 observations of 666 stars) and with a more extended wavelength coverage as the data from the near-infrared arm of the X-shooter spectrograph are now included. The DR2 spectra then consist of three segments that were observed simultaneously and, if combined, cover the range between similar to 300 nm and similar to 2.45 mu m at a spectral resolving power close to R;=;10 \& x2006;000. The spectra were corrected for instrument transmission and telluric absorption, and they were also corrected for wavelength-dependent flux-losses in 85% of the cases. On average, synthesized broad-band colors agree with those of the MILES library and of the combined IRTF and Extended IRTF libraries to within similar to 1%. The scatter in these comparisons indicates typical errors on individual colors in the XSL of 2-4%. The comparison with 2MASS point source photometry shows systematics of up to 5% in some colors, which we attribute mostly to zero-point or transmission curve errors and a scatter that is consistent with the above uncertainty estimates. The final spectra were corrected for radial velocity and are provided in the rest-frame (with wavelengths in air). The spectra cover a large range of spectral types and chemical compositions (with an emphasis on the red giant branch), which makes this library an asset when creating stellar population synthesis models or for the validation of near-ultraviolet to near-infrared theoretical stellar spectra across the Hertzsprung-Russell diagram. (AU)

• Processo FAPESP: 18/05392-8 - Uma nova biblioteca de modelos de população estelar puramente teóricos
• Beneficiário: Paula Rodrigues Teixeira Coelho
• Modalidade de apoio: Auxílio à Pesquisa - Regular