Fig. 3. Conditional chemical abundances of carbon, nitrogen, and oxygen in the atmosphere of Betelgeuse at four different epochs: 31-01-2020, 19-03-2020, 04-04-2020, and 06-04-2020.
Chemical abundances of carbon, nitrogen, and oxygen are calculated under three scenarios. First scenario is effective temperature Teff = var, the chemical abundances are obtained at parameters according to Table 1 (blue filled circles). Second scenario is the chemical abundances are obtained at the assumption of constant effective temperature Teff = 3646 K and log g = 0.2 (green open squares). Third scenario is the chemical abundances are obtained at the assumption of constant effective temperature Teff = 3476 K and log g = 0.2 (pink open diamonds). a Carbon abundances calculated under three scenarios. b Nitrogen abundances calculated under three scenarios. c Oxygen abundances calculated under three scenarios. The dashed lines show solar abundances obtained in this study. Error bars represent standard deviation. Source data are provided as a Source Data file.