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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 $\text{FWHM}_{\text{Instrument}} = \frac{\lambda}{R}$.

The FWHM values are measured with SpcAudace at

spc_fwhm alplyr--profil-1c_sel 3934 3990 a
# Type de raie à ajuster : absorption
# Gaussienne ajustée : Imax=1.208854 ADU, Xc=3965.4946564 A, FWHM=44.722014838 A, Icont=-1.805338 ADU
# Le continuum à 3799.83395549 vaut 0.970143
# Le continuum à 4124.16604451 vaut 1.919091
# Continuum autour de la raie : 1.444617
# Courbe gaussienne sauvée sous alplyr--profil-1c_sel_gauss
# 
La gausienne ajustée est définie par :
 Intensité=1.208854 +/- 0.003081 ADU
 Centre=3965.4946564 +/- 3.67599553195 A
 FWHM=44.722014838 +/- 6.52887092647 A
# 
FWHM mesurée : 3.04149001606 pixels
# La FWHM de la raie est : 44.722014838 +/- 6.52887092647 A (ie +/- 14.6 %)
# 44.722014838 6.52887092647