Fig. 10.
Same as Fig. 9 but for (B − V) and (U − B) of HD 179821 between 1990 and 2010. The bluest value reached during the blue loop evolution is (B − V) = 1.25, thus, (B − V)0 = 0.55 (extinctions in Table 1) happened at JD 24 53000 (2004). The mean spectroscopic temperature T(Sp) at the time according to Arkhipova et al. (2009) is 6800 K ± 50 K. After 2004 the star moved back on a red loop, see text.
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