rationalskepticism.org

newolder wrote:

Metallicity [Fe/H] +0.05 dex

- wiki on Betelgeuse

Where:

In physics and astrophysics, the number of orders of magnitude between two numbers is sometimes referred to as "dex", a contraction of "decimal exponent" (see f.e. Chemical abundance ratios). For instance, if two numbers are within 1 dex of each other, then the ratio of the larger to the smaller number is less than 10. Fractional values can be used, so if within 0.5 dex, the ratio is less than 100.5, and so on.

- wiki definition

Since 100.05 ~ 1, does that mean Betelgeuse's ratio [Fe/H] is close to 1? If so, then Betelgeuse is indeed ironic and/or doesn't have much hydrogen left...