Comparison of the empirical data of MILES spectral library against stellar theoret...
| 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 |