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Sirius A and B

0. Sirius A and B. 0. I l ( t l ) = I l (0) e -h n /kT + B l (T) (1 – e -h n /kT ). 0. Limb Darkening. 0. Structure of Spectral Lines. 0. Equivalent Width. W. 1. 0.8. 0.6. F l /F cont. 0.4. 0.2. l. l 0. 0. Doppler Broadening. Red shifted abs. Blue shifted abs. v r.

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Sirius A and B

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  1. 0 Sirius A and B

  2. 0 Il (tl) = Il (0) e-hn/kT + Bl(T) (1 – e-hn/kT)

  3. 0 Limb Darkening

  4. 0 Structure of Spectral Lines

  5. 0 Equivalent Width W 1 0.8 0.6 Fl/Fcont 0.4 0.2 l l0

  6. 0 Doppler Broadening Red shifted abs. Blue shifted abs. vr Observer vr Atoms in random thermal motion

  7. 0 Line Profiles Gauss Profile 1 0.8 Lorentz Profile 0.6 Fl/Fcont 0.4 0.2 l l0

  8. 0 Line Profiles Increasing number of absorbing atoms 1 0.8 0.6 Fl/Fcont 0.4 0.2 l l0

  9. 0 Curve of Growth Log(W/l0) ~ √Nfl -4 ~ √log(Nfl) -4.5 -5 ~ Nfl -5.5 11 12 13 14 15 16 Log(Nfl)

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