Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Coelho, P. R. T. [1, 2]
Total Authors: 1
Affiliation:
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
[2] Univ Cruzeiro Sul, Nucleo Astrofis Teor, BR-01506000 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 440, n. 2, p. 1027-1043, MAY 2014.
Web of Science Citations: 42
Abstract

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)

FAPESP's process: 13/17216-6 - International Workshop on Spectral Stellar Libraries
Grantee:Paula Rodrigues Teixeira Coelho
Support type: Research Grants - Meeting - Abroad
FAPESP's process: 09/09465-0 - The modeling of stellar populations and detailed abundance pattern
Grantee:Paula Rodrigues Teixeira Coelho
Support type: Scholarships in Brazil - Young Researchers
FAPESP's process: 08/58406-4 - The modeling of stellar populations and detailed abundance patterns
Grantee:Paula Rodrigues Teixeira Coelho
Support type: Research Grants - Young Investigators Grants