wiki.stibor.net

SIMBAD Astronomical Database

Comparison multiplot with Christian Buil's library of reference data.

2D-spectra image and inverted

Created artificial colored 2D-spectra image

Determination of the surface temperature

spc_ajustplanck alplyr--profil-1c_sel
# Le continuum vaut 0.303090909091
# Les limites non nulles sont 0 ; 321
# l2= 345.385, h1= 1.38461, len=322 ; # norm2= 690.77 ; # Calcul de l'ajustement...
# T=1000 ; # T=2000 ; # T=3000, RMS=0.37777840488 ; # T=4000 ; # RMS=0.142109035409 ; # T=5000 ; # RMS=0.109888603881 ; # T=6000 ; # RMS=0.0952562081394 ; # T=7000 ; # RMS=0.0887952608898 ; # T=8000 ; # RMS=0.086230311707 ; # T=9000 ; # RMS=0.0855422553528 ; # T=10000 ; # RMS=0.0857544683719 ; # 
# Température déterminée : 0.086230311707>RMS=0.0855422553528<0.0857544683719
# Calcul de la courbe de Planck de l'UV au rouge...
# Température trouvée : 9000 K
# 9000

The resolving power is defined as $R = \frac{\lambda}{\Delta \lambda}$, where $\lambda$ is the wavelength and $\Delta \lambda$ the wavelength interval defined as the spectral resolution. The spectral resolution is the smallest wavelength interval that can be distinguished and is expressed in wavelength units as Å or nanometers. In addition, it can be expressed as the $\Delta \lambda = \text{FWHM}_{\text{Instrument}} = \frac{\lambda}{R}$.

The FWHM values are measured with SpcAudace at

spc_fwhm alplyr--profil-1c_sel 3934 3990 a
# 44.722014838 6.52887092647

spc_fwhm alplyr--profil-1c_sel 4056 4143 a
# 47.6019613648 7.1041365302

spc_fwhm alplyr--profil-1c_sel 4304 4416 a
# 54.6684579023 4.66692282694

spc_fwhm alplyr--profil-1c_sel 4825 4905 a
# 65.4526604596 6.58084006378

and result in a mean FWHM value of $53.11127$ Å and a mean resolving power of $\frac{1}{4} (\frac{4860}{65.4526604596} + \frac{4340}{54.6684579023} + \frac{4101}{47.6019613648} + \frac{3966}{44.722014838}) = 82.11821$