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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A new library of theoretical stellar spectra with scaled-solar and alpha-enhanced mixtures

Texto completo
Autor(es):
Coelho, P. R. T. [1, 2]
Número total de Autores: 1
Afiliação do(s) autor(es):
[1] Univ Cruzeiro Sul, Nucleo Astrofis Teor, BR-01506000 Sao Paulo - Brazil
[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 440, n. 2, p. 1027-1043, MAY 2014.
Citações Web of Science: 37
Resumo

Theoretical stellar libraries have been increasingly used to overcome limitations of empirical libraries, e. g. by exploring atmospheric parameter spaces not well represented in the latter. This work presents a new theoretical library which covers 3000 <= T-eff <= 25 000 K, -0.5 <= log g <= 5.5 and 12 chemical mixtures covering 0.0017 <= Z <= 0.049 at both scaled-solar and a-enhanced compositions. This library complements previous ones by providing: (i) homogeneous computations of opacity distribution functions, models atmospheres, statistical surface fluxes and high-resolution spectra; (ii) high-resolution spectra with continua slopes corrected by the effect of predicted lines and (iii) two families of alpha-enhanced mixtures for each scaled-solar iron abundance, to allow studies of the alpha-enhancement both at `fixed iron' and `fixed Z' cases. Comparisons to observed spectra were performed and confirm that the synthetic spectra reproduce well the observations, although there are wavelength regions which should be still improved. The atmospheric parameter scale of the model library was compared to one derived from a widely used empirical library, and no systematic difference between the scales was found. This is particularly reassuring for methods which use synthetic spectra for deriving atmospheric parameters of stars in spectroscopic surveys. (AU)

Processo FAPESP: 13/17216-6 - International Workshop on Spectral Stellar Libraries
Beneficiário:Paula Rodrigues Teixeira Coelho
Linha de fomento: Auxílio à Pesquisa - Reunião - Exterior
Processo FAPESP: 09/09465-0 - O modelamento de populações estelares e padrões de abundância detalhados
Beneficiário:Paula Rodrigues Teixeira Coelho
Linha de fomento: Bolsas no Brasil - Apoio a Jovens Pesquisadores
Processo FAPESP: 08/58406-4 - A modelagem de populações estelares e padrões de abundância detalhados
Beneficiário:Paula Rodrigues Teixeira Coelho
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores