Table 3
Spectral type variability among CSGs observed on multiple epochs.
| Galaxy | CSGs observed | Variable CSGs found |
|
||
| (and epochs) | in all these epochs | Number | Fraction | ± Δf | (subtypes) |
|
|
|||||
| SMC (all three epochs) | 108 | 88 | 0.84 | 0.10 | 3.0 |
| SMC (2010−2012) | 102 | 48 | 0.47 | 0.10 | 2.9 |
| LMC (2010−2013) | 79 | 26 | 0.33 | 0.11 | 2.3 |
Notes. The number of CSGs tagged as variable, the fraction with respect to the total number n, and the 2σ confidence intervals for the fractions (Δf), which are equal to 
. Cool supergiants are tagged as variable if their SpT changed between any two of the epochs indicated by more than 1 subtype. The SMC sample is showed twice, one using all three available epochs to check its variability, and the other using only the 2010 and 2012 epochs. We also show the mean SpT change among the CSGs tagged as variables (in the case of three epochs, we only show the largest change measured for each star.)
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