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Stars as Laboratories for Fundamental Physics - MPP Theory Group

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64 Chapter 2<br />

convert to an absolute bolometric brightness difference ∆M tip<br />

HB rather<br />

than using the visual brightness difference ∆VHB.<br />

tip<br />

Fig. 2.18. Evolutionary speed on the RGB <strong>for</strong> a model with M = 0.8 M ⊙ ,<br />

metallicity Z = 10 −4 , and initial helium abundance Y = 0.240 (Raffelt and<br />

Weiss 1992). The d<strong>as</strong>hed line is the tangent near the bright end.<br />

Fig. 2.19. Luminosity function of the RGB of the globular cluster NGC 2808<br />

which h<strong>as</strong> [Fe/H] = −1.37 (Fusi Pecci et al. 1990).

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