Post on 19-Dec-2015
Observational techniquesmeeting #9
Spectroscopy
Spectral analysis provides:
• Redshift/distance• Composition• Velocity/dynamics
Redshift
z=0 - Stars
Plate spectra
Modern stellar spectra: O star
He II
Modern stellar spectra: O/B
He II
He I
Modern stellar spectra: B
He II
He I
Black body break
Modern stellar spectra: A
He II
He I
Black body break
Modern stellar spectra: F
Mg I
Na D
Black body break
Ca H+K
Modern stellar spectra: F
Mg I
Na D
Black body break
Ca H+K
G band
Modern stellar spectra: G
Mg I
Na DBlack body break
Ca H+K
G band
Ca IRtriplet
Modern stellar spectra: K
Mg I
Na D
Black body break
Ca H+K
Mollecular bands
Ca IRtriplet
Modern stellar spectra: M
Mg I
Na D
Mollecular bands
Ca IRtriplet
Modern stellar spectra: Brown dwarfs (L, T, Y)
Mollecular bands
Modern stellar spectra: Carbon stars (C,S stars)
Mg I
Na D
Modern stellar spectra: White dwarf stars DA
Modern stellar spectra: White dwarf stars DB
Modern stellar spectra: Wolf-Rayet stars: WN/WC/WO
End