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