Stellar Spectra
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Stellar Spectra

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    Stellar Spectra Stellar Spectra Presentation Transcript

    • Stars And Their Spectra
    • Gemini North 8 m Orion Observing Stars
    • Spectra of Atoms: Emission and Absorption Electron Energy Level
    • Spectra of Atoms: Emission and Absorption Absorption
    • Spectra of Atoms: Emission and Absorption Absorption
    • Spectra of Atoms: Emission and Absorption Higher energy photon Absorption
    • Spectra of Atoms: Emission and Absorption Absorption
    • Spectra of Atoms: Emission and Absorption
    • Spectra of Atoms: Emission and Absorption
    • Gemini North 8 m Light reflects from primary onto secondary and enters the slit hitting the diffraction grating. Spectrographs
    • Spectrum of the Sun Fraunhofer Lines
    • Spectra of Atoms Star
    • Spectra of Atoms Star
    • Spectrum of the Sun From terrestrial telescope From space telescope
    • Spectrum of the Sun From terrestrial telescope From space telescope Atmospheric absorption lines
    • The Electromagnetic Spectrum and the Atmosphere
    • Spectrum of the Sun Blackbody Curve 500 nm
    • Spectrum of the Sun Blackbody Curve 500 nm Wien’s Law:  peak T = 0.0029 T = 5800 K
    • Blackbody Curves in Orion
    • Classification of Stars O O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 Blue-violet B B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 Blue-white A A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 White F F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 Yellow-white G G0 G1 G2 G3 G4 G5 G6 G7 G8 G9 Yellow K K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 Orange M M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 Red-orange Spectral Colour Type
    • Classification of Stars O O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 Blue-violet B B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 Blue-white A A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 White F F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 Yellow-white G G0 G1 G2 G3 G4 G5 G6 G7 G8 G9 Yellow K K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 Orange M M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 Red-orange Sun Spectral Colour Type
    • Classification of Stars O Blue-violet 28000-50000 B Blue-white 10000-28000 A White 7500-10000 F Yellow-white 6000-7500 G Yellow 5000-6000 K Orange 3500-5000 M Red-orange 2500-3500 Spectral Colour Temperature (K) Type
    • Classification of Stars O Blue-violet 28000-50000 Ionised atoms - He B Blue-white 10000-28000 Neutral He, some H A White 7500-10000 Strong H, some ionised metals F Yellow-white 6000-7500 H and ionised Ca, Fe G Yellow 5000-6000 Neutral and ionised metals K Orange 3500-5000 Neutral metals M Red-orange 2500-3500 Strong TiO and neutral Ca Spectral Colour Temperature (K) Spectral Lines Type
    • The Orion Nebula - a stellar nursery containing O and B-type stars
    • Doppler Effect Towards us Away from us
    • Measuring the Rotation of the Sun
    • Measuring the Rotation of the Sun Doppler Effect: (  -  0 )/  0 = v/c  = Doppler shifted wavelength  0 = stationary wavelength v = velocity of rotation c = speed of light
    • Spectroscopic Binary Systems A B A A A A B B B B A B No Doppler shift No Doppler shift 1 2 3 4