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Stars Evening Classes Week Three The Sun and Stars Presented by Oisn Creaner Slide 2 Corona Convective Zone Radiative Zone Photosphere Core Interior of the Sun Slide 3 The Sun Slide 4 Sunspots Slide 5 The Sun Slide 6 Causes of sunspots Slide 7 Stellar Classes Slide 8 Emission & Absorption Spectra Slide 9 Binary Stars - the Doppler Effect! Slide 10 Doppler Effect Slide 11 Spectral Class of some well known stars Slide 12 MASS-LUMINOSITY RELATIONSHIP L = M 35 01 35 = 01 x 01 x 01 x 01 = 1/3,000 th 2 35 = 2 x 2 x 2 x 2 = 1131 100 35 = 100 x 100 x 100 x 100 = 10 million. Slide 13 Stars Evening Classes Week Three Presented by Oisn Creaner Slide 14 Hydrostatic Equilibrium Slide 15 Hydrostatic Equilibrium The collapsing nebulas core is squeezed by gravity Slide 16 Hydrostatic Equilibrium It reaches 10 million degrees. Slide 17 P P P Extent of electro- magnetic force (repulsive) Extent of strong nuclear force (attractive) Slide 18 Hydrostatic Equilibrium Balance between gravitation & thermal expansion Slide 19 Core Helium Enrichment Slide 20 Helium Core Hydrogen fusing shell Slide 21 Helium Core Hydrogen fusing shell Slide 22 Helium Core Hydrogen Envelope Slide 23 A Stars Life - Death After the main sequence Slide 24 Slide 25 Supernovae Slide 26 The Sun in 5 billion years Slide 27 Planetary Nebulae Slide 28 White Dwarfs Slide 29 Thank You www.astronomy.ie/handouts www.stellarium.org Useful websites