Fitting Code

Grids of model atmospheres were obtained from Robert Kurucz's web page (http://cfaku5.harvard.edu/) and spectra were produced from these using Kurucz's fortran code SYNTHECD with the linelist from CD ROM 23. Two sets of model spectra were made where was either 1.0 or 2.0 kms^-1. All spectra span the parameters T_eff, and [Fe/H] as shown in Table 3. Each model spectrum was convolved to the instrument resolution and resampled in flux corresponding to the wavelengths in the GRO J1655-40 spectrum. They were then rotationally broadened to the grid values (Table 3). Our program interpolates between these models and performs a minimum- fit over 6480-6600 Å, determining the best model fit to our data.

Table 3: Kurucz model spectra parameters.

Parameter Range Step Teff (K) 5500 - 7000 500 3.0 - 4.5 0.5 [Fe/H] -1.0 - 1.0 1.0 (kms-1) 0 - 150 50

© Copyright Astronomical Society of Australia 1997