________________________________________________________________________________________________ Table: Cosmic Composition ________________________________________________________________________________________________ Substance Primordial Cosmic Composition Solar Composition Solar Composition Cosmic Fiducial Values Asplund et al. (2009) Rounded Composition (Approx. Modern Fiducial Values Cosmic Composition) (mass fraction) (mass fraction) (mass fraction) (mass fraction) ________________________________________________________________________________________________ Hydrogen (H,X) 0.75 0.75-Z 0.7381 0.74 = 74 % Helium (He,Y) 0.25 0.25 0.2485 0.25 = 25 % Metalliticity (Z) 0.001 Z 0.0134 0.01 = 1 % Deuterium (D, H-2) 10**(-3) Helium-3 (He,Y) 10**(-4) Lithium-7 (L-7) 10**(-9) ________________________________________________________________________________________________Notes:
Credit/Permission: ©
David Jeffery,
2016 / Own work.
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Table: Stellar Population Metallicity for the Milky Way
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Population I Population II Population III
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Age young disk <∼ 1 Gyr ∼ 12--13 Gyr >∼ 13 Gyr
(lookback time old disk ∼ 1--9 Gyr
to formation)
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Metallicity [Fe/H] ∼ -0.5--0.3 bulge ∼ -0.5--0.5 ∼ -∞
(abundance halo ∼ -8--(-1)
ratio)
Metallicity 0.006--0.04 2*10**(-10)--0.002 0 for Fe, but
(mass fraction 10**(-9) for Li-7.
very approx.)
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Notes:
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