Table 3
Model sensitivity of Strömgren photometric indices.
| Phase | Teff | log g | [A/H] | Δu | Δv | Δb | Δy | ΔCa II | Δm1 | Δc1 | Δcy | Δδ4 | C-normal, N-poor minus |
|
|
|||||||||||||
| SGB | 5578 | 3.44 | –2.23 | –0.056 | 0.002 | 0.000 | 0.000 | 0.003 | 0.002 | –0.061 | –0.061 | –0.059 | C–normal, N-rich |
| RGB–bump | 5018 | 2.00 | –2.23 | –0.082 | 0.003 | 0.001 | 0.000 | 0.003 | 0.001 | –0.088 | –0.089 | –0.086 | C–normal, N-rich |
| MV = − 1 | 4857 | 1.60 | –2.23 | –0.087 | 0.001 | 0.000 | 0.000 | 0.003 | 0.001 | –0.090 | –0.090 | –0.089 | C–normal, N-rich |
| .... | .... | .... | .... | –0.062 | –0.003 | 0.000 | 0.000 | 0.003 | –0.003 | –0.056 | –0.056 | –0.059 | (a) |
| SGB | 5537 | 3.53 | –1.63 | –0.099 | –0.007 | 0.000 | 0.000 | –0.002 | –0.007 | –0.086 | –0.086 | –0.092 | C–normal, N-rich |
| RGB–bump | 5001 | 2.19 | –1.63 | –0.144 | –0.043 | 0.000 | 0.000 | –0.005 | –0.043 | –0.059 | –0.059 | –0.102 | C–normal, N-rich |
| MV = − 1 | 4683 | 1.51 | –1.63 | –0.175 | –0.102 | –0.002 | 0.000 | –0.007 | –0.101 | 0.027 | 0.028 | –0.071 | C–normal, N-rich |
| .... | .... | .... | .... | –0.096 | –0.043 | 0.000 | 0.000 | –0.005 | –0.043 | –0.009 | –0.009 | –0.052 | (a) |
| SGB | 5369 | 3.44 | –1.23 | –0.138 | –0.022 | 0.001 | 0.001 | 0.000 | –0.023 | –0.093 | –0.093 | –0.116 | C–normal, N-rich |
| RGB–bump | 4948 | 2.42 | –1.23 | –0.176 | –0.076 | 0.001 | 0.000 | –0.002 | –0.078 | –0.023 | –0.024 | –0.101 | C–normal, N-rich |
| .... | .... | .... | .... | –0.221 | –0.163 | –0.010 | –0.002 | –0.012 | –0.161 | 0.096 | 0.103 | –0.050 | C–rich, N-rich |
| MV = − 1 | 4478 | 1.40 | –1.23 | –0.189 | –0.149 | –0.002 | 0.000 | –0.006 | –0.145 | 0.107 | 0.109 | –0.038 | C–normal, N-rich |
| .... | .... | .... | .... | –0.014 | –0.025 | –0.006 | –0.002 | –0.021 | –0.015 | 0.030 | 0.034 | 0.015 | C–rich, N-poor |
| .... | .... | .... | .... | –0.251 | –0.274 | –0.027 | –0.006 | –0.021 | –0.226 | 0.270 | 0.291 | 0.044 | C–rich, N-rich |
| .... | .... | .... | .... | –0.162 | –0.103 | –0.001 | 0.000 | –0.006 | –0.101 | 0.042 | 0.043 | –0.058 | (a) |
| SGB | 5229 | 3.71 | –0.63 | –0.190 | –0.110 | –0.001 | 0.000 | –0.003 | –0.109 | 0.029 | 0.030 | –0.080 | C–normal, N-rich |
| RGB–bump | 4765 | 2.53 | –0.63 | –0.211 | –0.180 | –0.003 | 0.000 | –0.007 | –0.175 | 0.146 | 0.149 | –0.029 | C–normal, N-rich |
| MV = − 1 | 4016 | 1.08 | –0.63 | –0.153 | –0.176 | –0.005 | –0.001 | –0.011 | –0.166 | 0.193 | 0.197 | 0.027 | C–normal, N-rich |
| .... | .... | .... | .... | –0.097 | –0.123 | –0.002 | 0.000 | –0.011 | –0.118 | 0.146 | 0.148 | 0.028 | (a) |
Notes. (a) Δ computed as C-normal, N-poor minus C-normal, N-rich, but with a composition changed after the RGB bump for C,N. C-normal, N-poor stars have: [C/Fe] = [N/Fe] = 0, [O/Fe] = [Mg/Fe] = [Ca/Fe] = +0.4, [Ti/Fe] = 0.2; C-normal, N-rich stars have [C/Fe] = −0.2, [N/Fe] = +1.3, [O/Fe] = −0.1 (and the same abundances for Mg, Ca, and Ti); C-rich, N-poor stars have [C/Fe] = +0.2, [N/Fe] = 0.0, O and other elements as in first case; C-rich, N-rich stars have [C/Fe] = +0.2, [N/Fe] = +1.3, [O/Fe] = −0.1 and other elements as in the first case.
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