Table 2.
Predicted and measured gap parameters for NGC 6397.
| Model | g | w | D | R |
|---|---|---|---|---|
| Nominal | 21.06 | 0.03 | 0.44 | 1.34 |
| [M/H]= − 2.1 | 20.97 | 0.03 | 0.45 | 1.34 |
| [M/H]= − 1.7 | 21.17 | 0.02 | 0.49 | 1.37 |
| [O/M] = 0.0 | 21.07 | 0.03 | 0.44 | 1.34 |
| [O/M] = 0.6 | 21.07 | 0.03 | 0.45 | 1.34 |
| Y = 0.23 | 21.04 | 0.03 | 0.49 | 1.38 |
| Y = 0.27 | 21.10 | 0.03 | 0.43 | 1.32 |
| T = 11.6 Gyr | 21.07 | 0.02 | 0.48 | 1.36 |
| T = 13.6 Gyr | 21.06 | 0.03 | 0.43 | 1.31 |
| αMLT = 1.62 | 21.06 | 0.03 | 0.46 | 1.34 |
| αMLT = 2.02 | 21.06 | 0.03 | 0.44 | 1.34 |
| dist = 2.338 kpc | 20.95 | 0.03 | 0.44 | 1.34 |
| dist = 2.578 kpc | 21.17 | 0.03 | 0.44 | 1.34 |
| E(B − V) = 0.19 | 21.00 | 0.03 | 0.45 | 1.33 |
| E(B − V) = 0.25 | 21.13 | 0.03 | 0.44 | 1.33 |
| α = −2 | 21.06 | 0.03 | 0.44 | 1.31 |
| α = +2 | 21.06 | 0.03 | 0.44 | 1.37 |
| Measured | 21.060 | 0.0486 | 0.682 | 1.327 |
| ±0.018 | ±0.0060 | ±0.044 | ±0.055 | |
Notes. g is the predicted magnitude, w is the width, D is the depth of the gap, and R is the size of the associated step in star counts. The nominal model assumes [M/H]= − 1.9, [O/M] = 0.3, Y = 0.25, T = 12.6 Gyr, αMLT = 1.82, E(B − V) = 0.22, d = 2.458 kpc, and α = 0. The remaining rows show the effect of varying one parameter at a time. Measured values at the bottom are taken from Table 1.
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