Bibcode
Allende-Prieto, C.; Mészáros, Sz.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 430, Issue 4, p.3285-3291
Advertised on:
4
2013
Citations
16
Refereed citations
15
Description
We present tests carried out on optical and infrared stellar spectra to
evaluate the accuracy of different types of interpolation. Both model
atmospheres and continuum normalized fluxes were interpolated. In the
first case, we used linear interpolation, and in the second linear,
cubic spline, cubic Bezier and quadratic Bezier methods. We generated
400 ATLAS9 model atmospheres with random values of the atmospheric
parameters for these tests, spanning between -2.5 and +0.5 in [Fe/H],
from 4500 to 6250 K in effective temperature, and 1.5 to 4.5 dex in
surface gravity. Synthesized spectra were created from these model
atmospheres, and compared with spectra derived by interpolation. We
found that the most accurate interpolation algorithm among those
considered in flux space is cubic Bezier, closely followed by quadratic
Bezier and cubic splines. Linear interpolation of model atmospheres
results in errors about a factor of 2 larger than linear interpolation
of fluxes, and about a factor of 4 larger than high-order flux
interpolations.
Related projects
Chemical Abundances in Stars
Stellar spectroscopy allows us to determine the properties and chemical compositions of stars. From this information for stars of different ages in the Milky Way, it is possible to reconstruct the chemical evolution of the Galaxy, as well as the origin of the elements heavier than boron, created mainly in stellar interiors. It is also possible to
Carlos
Allende Prieto