Improving Synthetic Stellar Libraries with Gaia Benchmark Stars

• Grant number: 18/26381-4
• Support Opportunities: Scholarships abroad - Research
• Start date: August 01, 2019
• End date: January 31, 2020
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
• Principal Investigator: Lucimara Pires Martins
• Grantee: Lucimara Pires Martins
• Host Investigator: Philippe C Prugniel
• Host Institution: Pró-Reitoria de Pós-Graduação e Pesquisa. Universidade Cruzeiro do Sul (UNICSUL). São Paulo , SP, Brazil
• Institution abroad: Université Claude Bernard Lyon 1, France

Abstract

Libraries of stellar spectra are fundamental tools for the study of stellar popu-lations. Despite the significant improvement of recent libraries, there is still a lot tobe done in order to have libraries that are able to generate models that can reproducethe observed stellar population spectra of real galaxies. Theoretical stellar libraries areparticularly interesting for stellar population models, since it is impossible to reproducethe spectrum of galaxies with chemical histories that differ from our solar neighborhoodusing only the spectra of observed stars. On the other hand, theoretical stellar spectraare still very imprecise. One of the major difficulties of theoretical spectra is the atomicand molecular line list used to generate it. Very few of the atomic and molecularparameters of these lists were measured in laboratory, and because of that, most ofthem are very uncertain. We propose in this work an innovative method to calibrateatomic lines lists - ALiCCE (Atomic Lines Calibration using Cross-Entropy algorithm).This method allows the the calibration to be done in a robust and efficient way. Themethod will be applied on a set of fundamental stars from the Gaia Benchmark library.The improved line list can then be used to generate theoretical stellar models withunprecedented accuracy.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

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.; et al. The X-shooter Spectral Library (XSL): Data Release 3. Astronomy & Astrophysics, v. 660, p. 26-pg., 2022-04-05. (18/26381-4, 18/05392-8)

JAIN, RASHI; PRUGNIEL, PHILIPPE; MARTINS, LUCIMARA; LANCON, ARIANE. NGC 6397: The metallicity trend along the isochrone revisited. Astronomy & Astrophysics, v. 635, MAR 27 2020. (18/26381-4)

VERRO, K.; TRAGER, S. C.; PELETIER, R. F.; LANCON, A.; ARENTSEN, A.; CHEN, Y-P; COELHO, P. R. T.; DRIES, M.; FALCON-BARROSO, J.; GONNEAU, A.; et al. Modelling simple stellar populations in the near-ultraviolet to near-infrared with the X-shooter Spectral Library (XSL). Astronomy & Astrophysics, v. 661, p. 30-pg., 2022-05-02. (18/05392-8, 18/26381-4)