Inverse problem solution for A0620−00 according to the model with spots (a).
| Parameter . | |$C\, 2015-2016$| . | |$J\, 2016$| . | |$K\, 2016$| . | |$C\, 2016-2017$| . | |$J\, 2017$| . | |$K\, 2017$| . |
|---|---|---|---|---|---|---|
| . | Passive state . | Active state . | ||||
| Accretion disc | ||||||
| αg | 0.528(1) | 0.684(1) | 0.749(1) | 0.557(1) | 0.686(3) | 0.671(2) |
| Tin, K | 94 360 | 208 790 | 253 980 | 120 090 | 252 565 | 208 230 |
| ±320 | ±1 300 | ±1 300 | ±2 500 | ±2 500 | ±2 740 | |
| Cool spot 1 | ||||||
| Rsp/R2 | 0.37(1) | 0.19(9) | 0.35(4) | 0.35(4) | 0.49(6) | 0.35(4) |
| Fsp | 0.16(6) | 0.35(9) | 0.15(9) | 0.95(5) | 0.87(2) | 0.15(9) |
| η, ° | 143 ± 8 | 65 ± 34 | 70 ± 7 | 13 ± 5 | 13 ± 5 | 70 ± 7 |
| ϕ, ° | 147 ± 9 | 136 ± 13 | 132 ± 3 | 21 ± 15 | 94 ± 21 | 132 ± 3 |
| Cool spot 2 | ||||||
| Rsp/R2 | 0.32(3) | 0.25(9) | 0.20(9) | 0.32(3) | 0.25(9) | 0.20(9) |
| Fsp | 0.25(5) | 0.4(3) | 0.25(8) | 0.25(5) | 0.4(3) | 0.25(8) |
| η, ° | 51 ± 6 | 85 ± 34 | 94 ± 25 | 51 ± 6 | 85 ± 34 | 94 ± 25 |
| ϕ, ° | 131 ± 4 | 129 ± 10 | 126 ± 10 | 131 ± 4) | 129 ± 10 | 126 ± 10 |
| Fn/Fall | 0.464(5) | 0.358(4) | 0.314(4) | 0.534(7) | 0.496(5) | 0.501(5) |
| N | 32 | 18 | 13 | 16 | 17 | 15 |
| |$\chi ^2_{N,\, 0.10}$| | 53.7 | 34.8 | 27.7 | 32.0 | 33.4 | 30.6 |
| χ2 | 79.5 | 168 | 35.4 | 32.9 | 73.7 | 76.7 |
| Parameter . | |$C\, 2015-2016$| . | |$J\, 2016$| . | |$K\, 2016$| . | |$C\, 2016-2017$| . | |$J\, 2017$| . | |$K\, 2017$| . |
|---|---|---|---|---|---|---|
| . | Passive state . | Active state . | ||||
| Accretion disc | ||||||
| αg | 0.528(1) | 0.684(1) | 0.749(1) | 0.557(1) | 0.686(3) | 0.671(2) |
| Tin, K | 94 360 | 208 790 | 253 980 | 120 090 | 252 565 | 208 230 |
| ±320 | ±1 300 | ±1 300 | ±2 500 | ±2 500 | ±2 740 | |
| Cool spot 1 | ||||||
| Rsp/R2 | 0.37(1) | 0.19(9) | 0.35(4) | 0.35(4) | 0.49(6) | 0.35(4) |
| Fsp | 0.16(6) | 0.35(9) | 0.15(9) | 0.95(5) | 0.87(2) | 0.15(9) |
| η, ° | 143 ± 8 | 65 ± 34 | 70 ± 7 | 13 ± 5 | 13 ± 5 | 70 ± 7 |
| ϕ, ° | 147 ± 9 | 136 ± 13 | 132 ± 3 | 21 ± 15 | 94 ± 21 | 132 ± 3 |
| Cool spot 2 | ||||||
| Rsp/R2 | 0.32(3) | 0.25(9) | 0.20(9) | 0.32(3) | 0.25(9) | 0.20(9) |
| Fsp | 0.25(5) | 0.4(3) | 0.25(8) | 0.25(5) | 0.4(3) | 0.25(8) |
| η, ° | 51 ± 6 | 85 ± 34 | 94 ± 25 | 51 ± 6 | 85 ± 34 | 94 ± 25 |
| ϕ, ° | 131 ± 4 | 129 ± 10 | 126 ± 10 | 131 ± 4) | 129 ± 10 | 126 ± 10 |
| Fn/Fall | 0.464(5) | 0.358(4) | 0.314(4) | 0.534(7) | 0.496(5) | 0.501(5) |
| N | 32 | 18 | 13 | 16 | 17 | 15 |
| |$\chi ^2_{N,\, 0.10}$| | 53.7 | 34.8 | 27.7 | 32.0 | 33.4 | 30.6 |
| χ2 | 79.5 | 168 | 35.4 | 32.9 | 73.7 | 76.7 |
Notes. Solutions are obtained with the following parameters being fixed: |$T_2 = 4\, 440$| K, R2/a0 = 0.161, |$T_1 = 64\, 500$| K, and R1 = 0.0003a0. The latitude η is counted from the star ‘tip’ to the backside hemisphere and ranges from 0° to 180°; the longitude ϕ is counted from the orbital plane clockwise if looking from the relativistic object and changes from 0° to 360°. The relative input of the non-stellar component light is Fn/Fall and it does not depend on interstellar reddening; |$\chi ^2_{N,\, 0.10}$| is the chi-square value at the significance level of 10 per cent for a number of average points in the light curve N.
Inverse problem solution for A0620−00 according to the model with spots (a).
| Parameter . | |$C\, 2015-2016$| . | |$J\, 2016$| . | |$K\, 2016$| . | |$C\, 2016-2017$| . | |$J\, 2017$| . | |$K\, 2017$| . |
|---|---|---|---|---|---|---|
| . | Passive state . | Active state . | ||||
| Accretion disc | ||||||
| αg | 0.528(1) | 0.684(1) | 0.749(1) | 0.557(1) | 0.686(3) | 0.671(2) |
| Tin, K | 94 360 | 208 790 | 253 980 | 120 090 | 252 565 | 208 230 |
| ±320 | ±1 300 | ±1 300 | ±2 500 | ±2 500 | ±2 740 | |
| Cool spot 1 | ||||||
| Rsp/R2 | 0.37(1) | 0.19(9) | 0.35(4) | 0.35(4) | 0.49(6) | 0.35(4) |
| Fsp | 0.16(6) | 0.35(9) | 0.15(9) | 0.95(5) | 0.87(2) | 0.15(9) |
| η, ° | 143 ± 8 | 65 ± 34 | 70 ± 7 | 13 ± 5 | 13 ± 5 | 70 ± 7 |
| ϕ, ° | 147 ± 9 | 136 ± 13 | 132 ± 3 | 21 ± 15 | 94 ± 21 | 132 ± 3 |
| Cool spot 2 | ||||||
| Rsp/R2 | 0.32(3) | 0.25(9) | 0.20(9) | 0.32(3) | 0.25(9) | 0.20(9) |
| Fsp | 0.25(5) | 0.4(3) | 0.25(8) | 0.25(5) | 0.4(3) | 0.25(8) |
| η, ° | 51 ± 6 | 85 ± 34 | 94 ± 25 | 51 ± 6 | 85 ± 34 | 94 ± 25 |
| ϕ, ° | 131 ± 4 | 129 ± 10 | 126 ± 10 | 131 ± 4) | 129 ± 10 | 126 ± 10 |
| Fn/Fall | 0.464(5) | 0.358(4) | 0.314(4) | 0.534(7) | 0.496(5) | 0.501(5) |
| N | 32 | 18 | 13 | 16 | 17 | 15 |
| |$\chi ^2_{N,\, 0.10}$| | 53.7 | 34.8 | 27.7 | 32.0 | 33.4 | 30.6 |
| χ2 | 79.5 | 168 | 35.4 | 32.9 | 73.7 | 76.7 |
| Parameter . | |$C\, 2015-2016$| . | |$J\, 2016$| . | |$K\, 2016$| . | |$C\, 2016-2017$| . | |$J\, 2017$| . | |$K\, 2017$| . |
|---|---|---|---|---|---|---|
| . | Passive state . | Active state . | ||||
| Accretion disc | ||||||
| αg | 0.528(1) | 0.684(1) | 0.749(1) | 0.557(1) | 0.686(3) | 0.671(2) |
| Tin, K | 94 360 | 208 790 | 253 980 | 120 090 | 252 565 | 208 230 |
| ±320 | ±1 300 | ±1 300 | ±2 500 | ±2 500 | ±2 740 | |
| Cool spot 1 | ||||||
| Rsp/R2 | 0.37(1) | 0.19(9) | 0.35(4) | 0.35(4) | 0.49(6) | 0.35(4) |
| Fsp | 0.16(6) | 0.35(9) | 0.15(9) | 0.95(5) | 0.87(2) | 0.15(9) |
| η, ° | 143 ± 8 | 65 ± 34 | 70 ± 7 | 13 ± 5 | 13 ± 5 | 70 ± 7 |
| ϕ, ° | 147 ± 9 | 136 ± 13 | 132 ± 3 | 21 ± 15 | 94 ± 21 | 132 ± 3 |
| Cool spot 2 | ||||||
| Rsp/R2 | 0.32(3) | 0.25(9) | 0.20(9) | 0.32(3) | 0.25(9) | 0.20(9) |
| Fsp | 0.25(5) | 0.4(3) | 0.25(8) | 0.25(5) | 0.4(3) | 0.25(8) |
| η, ° | 51 ± 6 | 85 ± 34 | 94 ± 25 | 51 ± 6 | 85 ± 34 | 94 ± 25 |
| ϕ, ° | 131 ± 4 | 129 ± 10 | 126 ± 10 | 131 ± 4) | 129 ± 10 | 126 ± 10 |
| Fn/Fall | 0.464(5) | 0.358(4) | 0.314(4) | 0.534(7) | 0.496(5) | 0.501(5) |
| N | 32 | 18 | 13 | 16 | 17 | 15 |
| |$\chi ^2_{N,\, 0.10}$| | 53.7 | 34.8 | 27.7 | 32.0 | 33.4 | 30.6 |
| χ2 | 79.5 | 168 | 35.4 | 32.9 | 73.7 | 76.7 |
Notes. Solutions are obtained with the following parameters being fixed: |$T_2 = 4\, 440$| K, R2/a0 = 0.161, |$T_1 = 64\, 500$| K, and R1 = 0.0003a0. The latitude η is counted from the star ‘tip’ to the backside hemisphere and ranges from 0° to 180°; the longitude ϕ is counted from the orbital plane clockwise if looking from the relativistic object and changes from 0° to 360°. The relative input of the non-stellar component light is Fn/Fall and it does not depend on interstellar reddening; |$\chi ^2_{N,\, 0.10}$| is the chi-square value at the significance level of 10 per cent for a number of average points in the light curve N.
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