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Table A.1.

Astrometry and photometry of Achernar B relative to Achernar A. The data points marked with a “•” flag were excluded from the orbital and spectral energy distribution fits.

Date MJD Instrument Δα Δδ λ fB/fA Flag
(mas) (mas) (μm) (%)
2006-10-04 54012.1328 VISIR 11.25 2.14 ± 0.57
2006-10-04 54012.1328 VISIR −184.00 ± 25.0 211.00 ± 25.0 8.59 1.95 ± 0.57
2007-06-27 54278.3673 NACO −85.77 ± 3.69 175.95 ± 3.74 2.17 2.17 ± 0.63
2007-06-27 54278.3677 NACO −84.82 ± 3.10 192.64 ± 3.09 2.17 2.94 ± 0.77
2007-07-08 54289.3243 NACO −78.48 ± 6.87 178.79 ± 7.08 2.17 2.02 ± 0.72 •
2007-07-08 54289.3246 NACO −83.69 ± 3.30 184.24 ± 3.29 2.17 2.28 ± 0.71
2007-08-01 54313.4218 NACO −61.87 ± 5.91 157.48 ± 5.63 2.17 3.38 ± 0.84 •
2007-08-01 54313.4221 NACO −65.57 ± 4.06 166.72 ± 3.75 2.17 3.27 ± 1.44
2007-08-09 54321.3553 NACO −80.18 ± 5.18 184.03 ± 5.61 2.17 2.61 ± 0.77 •
2007-08-09 54321.3558 NACO −86.02 ± 6.55 179.24 ± 6.59 2.17 2.21 ± 0.68 •
2007-08-09 54321.4110 NACO −55.21 ± 4.33 160.10 ± 3.81 2.17 4.55 ± 1.28 •
2007-08-09 54321.4115 NACO −54.51 ± 5.70 161.14 ± 4.56 2.17 2.66 ± 1.11 •
2007-10-27 54400.1953 NACO −18.75 ± 19.2 141.43 ± 13.0 2.17 3.52 ± 1.69 •
2007-10-27 54400.1962 NACO −17.47 ± 17.1 133.81 ± 13.5 2.17 4.27 ± 1.74 •
2007-10-27 54400.1989 NACO −48.36 ± 4.31 156.05 ± 4.26 1.64 3.09 ± 1.52
2007-10-27 54400.1996 NACO −35.32 ± 7.17 133.61 ± 8.40 1.64 4.00 ± 1.52 •
2007-10-27 54400.2015 NACO −54.25 ± 3.38 147.05 ± 3.58 1.09 4.06 ± 2.17 •
2007-10-27 54400.2021 NACO −64.08 ± 4.60 146.15 ± 4.72 1.09 3.52 ± 2.52 •
2007-10-28 54401.1258 NACO −49.93 ± 4.18 176.24 ± 4.91 2.17 1.62 ± 0.98 •
2007-10-28 54401.1267 NACO −48.02 ± 4.40 174.89 ± 4.94 2.17 1.89 ± 0.79 •
2007-10-28 54401.1280 NACO −50.59 ± 5.20 169.46 ± 5.60 1.64 2.03 ± 0.93 •
2007-10-28 54401.1287 NACO −51.59 ± 4.36 165.43 ± 4.45 1.64 2.60 ± 1.06
2007-10-28 54401.1301 NACO −52.22 ± 5.41 173.39 ± 6.63 1.09 1.59 ± 1.44 •
2007-10-28 54401.1307 NACO −41.49 ± 5.05 166.23 ± 4.82 1.09 2.54 ± 1.73 •
2007-11-01 54405.0067 NACO −52.22 ± 3.52 174.34 ± 4.00 2.17 1.24 ± 0.93 •
2007-11-01 54405.0076 NACO −53.44 ± 3.50 164.66 ± 3.54 2.17 1.70 ± 6.05 •
2007-11-01 54405.0088 NACO −63.94 ± 3.81 169.62 ± 3.79 1.64 2.20 ± 1.12 •
2007-11-01 54405.0095 NACO −55.48 ± 3.14 164.39 ± 3.17 1.64 3.20 ± 1.27
2007-11-01 54405.0108 NACO −80.13 ± 14.3 162.74 ± 6.57 1.09 4.09 ± 2.17 •
2007-11-01 54405.0114 NACO −79.43 ± 10.1 160.13 ± 5.72 1.09 4.19 ± 2.18 •
2007-11-07 54411.0984 NACO −36.77 ± 4.83 168.43 ± 5.30 2.17 1.17 ± 1.53 •
2007-11-07 54411.0992 NACO −43.58 ± 3.68 167.54 ± 3.92 2.17 1.69 ± 1.97 •
2007-11-07 54411.1008 NACO −37.98 ± 4.57 166.69 ± 4.75 1.64 2.54 ± 1.54 •
2007-11-07 54411.1015 NACO −47.98 ± 5.69 165.64 ± 5.60 1.64 2.98 ± 1.78 •
2007-11-07 54411.1028 NACO −40.58 ± 5.99 174.98 ± 7.47 1.09 1.01 ± 1.66 •
2007-11-07 54411.1034 NACO −46.33 ± 4.02 180.09 ± 5.30 1.09 0.92 ± 3.07 •
2007-12-22 54456.0693 NACO −29.90 ± 3.88 156.23 ± 4.12 2.17 1.38 ± 1.27 •
2007-12-22 54456.0701 NACO −25.76 ± 3.56 152.19 ± 3.65 2.17 1.90 ± 1.14 •
2007-12-22 54456.0725 NACO −27.71 ± 4.43 156.61 ± 4.90 1.64 1.88 ± 2.05 •
2007-12-22 54456.0731 NACO −28.40 ± 3.66 154.56 ± 3.80 1.64 2.48 ± 2.04 •
2007-12-22 54456.0742 NACO −34.64 ± 6.67 144.28 ± 6.21 1.09 3.00 ± 1.93 •
2007-12-22 54456.0748 NACO −32.06 ± 3.30 137.53 ± 3.34 1.09 3.90 ± 1.63
2008-11-04 54779.0000 AMBER 1.64 2.26 ± 0.09
2008-11-04 54779.0000 AMBER 2.17 2.29 ± 0.09
2008-11-04 54774.1213 AMBER 20.23 ± 0.50 −46.54 ± 0.95 HK
2008-11-08 54778.1213 AMBER 16.99 ± 0.55 −48.42 ± 0.97 HK
2008-11-10 54780.1213 AMBER 15.37 ± 0.61 −49.36 ± 1.00 HK
2008-11-14 54784.1213 AMBER 12.13 ± 0.76 −51.24 ± 1.08 HK
2009-01-04 54835.0214 NACO −44.45 ± 3.51 −56.62 ± 3.10 1.75 1.36 ± 1.14 •
2009-01-04 54835.0254 NACO −38.65 ± 3.59 −58.26 ± 3.31 1.64 1.79 ± 0.79 •
2009-01-04 54835.0290 NACO −44.27 ± 3.33 −81.38 ± 3.51 2.12 2.12 ± 0.96 •
2009-01-04 54835.0319 NACO −46.44 ± 3.81 −86.91 ± 4.36 2.17 1.35 ± 0.80 •
2009-01-07 54838.0356 NACO −34.91 ± 2.99 −44.26 ± 3.19 2.17 2.12 ± 1.46 •
2009-01-07 54838.0381 NACO −38.88 ± 2.94 −43.46 ± 3.05 2.12 1.68 ± 1.37 •
2009-01-07 54838.0451 NACO −33.65 ± 12.8 −87.41 ± 30.0 1.28 −0.80 ± 2.30 •
2009-01-07 54838.0475 NACO −37.68 ± 2.87 −69.06 ± 2.87 1.26 −0.57 ± 2.50 •
2009-01-07 54838.0500 NACO −37.00 ± 11.1 −67.25 ± 11.3 1.09 −1.69 ± 2.00 •
2009-01-07 54838.0945 NACO SAM −33.14 ± 1.74 −61.91 ± 1.66 1.64 2.67 ± 0.19
2009-01-07 54838.0945 NACO SAM −30.63 ± 1.54 −58.14 ± 1.68 2.18 2.55 ± 0.13
2009-01-07 54838.0945 NACO SAM −29.60 ± 1.06 −62.76 ± 1.16 2.12 2.60 ± 0.10
2009-10-06 55110.2083 NACO −159.79 ± 2.69 −13.17 ± 2.68 2.12 2.91 ± 0.73
2009-10-06 55110.2095 NACO −165.91 ± 2.68 −12.74 ± 2.68 1.75 2.77 ± 0.61
2009-10-06 55110.2105 NACO −164.29 ± 2.66 −11.06 ± 2.66 1.64 2.53 ± 0.58
2009-10-06 55110.2117 NACO −164.48 ± 2.68 −11.50 ± 2.68 1.28 2.75 ± 0.60
2009-10-06 55110.2128 NACO −163.19 ± 2.67 −12.63 ± 2.67 1.26 3.14 ± 0.69
2009-10-06 55110.2140 NACO −165.83 ± 2.66 −12.80 ± 2.66 1.24 2.86 ± 0.58
2009-10-06 55110.2151 NACO −163.10 ± 2.67 −14.96 ± 2.67 1.09 2.95 ± 0.74
2009-10-06 55110.2163 NACO −164.89 ± 2.69 −11.66 ± 2.70 1.08 3.09 ± 0.74
2009-10-06 55110.2174 NACO −162.66 ± 2.68 −13.22 ± 2.68 1.04 3.05 ± 0.78
2009-10-06 55110.2189 NACO −161.11 ± 2.69 −13.91 ± 2.69 2.17 2.81 ± 0.74
2009-10-08 55112.2239 NACO −159.84 ± 2.69 −12.44 ± 2.68 2.17 2.78 ± 0.66
2009-10-08 55112.2252 NACO −158.77 ± 2.69 −12.97 ± 2.69 2.12 2.81 ± 0.65
2009-10-08 55112.2264 NACO −163.43 ± 2.72 −11.67 ± 2.72 1.75 3.08 ± 0.63
2009-10-08 55112.2275 NACO −164.53 ± 2.66 −10.73 ± 2.66 1.64 2.43 ± 0.51
2009-10-08 55112.2287 NACO −164.23 ± 2.67 −11.16 ± 2.67 1.28 2.62 ± 0.60
2009-10-08 55112.2299 NACO −163.31 ± 2.67 −10.94 ± 2.67 1.26 3.01 ± 0.69
2009-10-08 55112.2311 NACO −162.73 ± 2.69 −10.67 ± 2.69 1.24 3.13 ± 0.71
2009-10-08 55112.2323 NACO −161.88 ± 2.75 −11.26 ± 2.75 1.09 3.25 ± 0.75
2009-10-08 55112.2335 NACO −161.11 ± 2.74 −11.14 ± 2.74 1.08 3.28 ± 0.76
2009-10-08 55112.2346 NACO −164.22 ± 2.70 −11.93 ± 2.70 1.04 3.25 ± 0.79
2010-10-23 55492.1995 NACO −240.63 ± 2.67 71.28 ± 2.67 2.17 2.35 ± 0.43
2010-10-23 55492.2007 NACO −242.28 ± 2.66 73.93 ± 2.66 1.75 2.43 ± 0.47
2010-10-23 55492.2018 NACO −241.42 ± 2.68 72.63 ± 2.68 1.28 2.08 ± 0.38
2010-10-23 55492.2030 NACO −238.56 ± 2.67 72.60 ± 2.67 1.24 2.30 ± 0.36
2010-10-23 55492.2041 NACO −241.21 ± 2.69 71.52 ± 2.69 1.08 2.22 ± 0.41
2010-10-23 55492.2053 NACO −241.31 ± 2.67 73.44 ± 2.67 1.04 1.90 ± 0.42
2010-11-18 55518.0295 NACO −245.01 ± 2.65 77.03 ± 2.65 1.64 2.55 ± 0.52
2010-11-18 55518.0307 NACO −244.59 ± 2.66 77.67 ± 2.66 2.17 2.75 ± 0.55
2010-11-18 55518.0318 NACO −243.77 ± 2.65 77.39 ± 2.65 1.64 2.34 ± 0.44
2010-11-18 55518.0330 NACO −244.83 ± 2.66 75.80 ± 2.66 1.26 2.17 ± 0.39
2010-11-18 55518.0341 NACO −246.35 ± 2.67 76.18 ± 2.67 1.09 1.99 ± 0.39
2010-11-18 55518.0353 NACO −244.28 ± 2.67 75.08 ± 2.67 1.04 1.91 ± 0.37
2011-09-23 55827.2460 NACO −255.57 ± 2.66 138.45 ± 2.66 2.17 2.31 ± 0.45
2011-09-23 55827.2487 NACO −255.39 ± 2.67 135.12 ± 2.67 2.17 2.17 ± 0.44
2011-09-23 55827.2501 NACO −253.92 ± 2.66 136.54 ± 2.66 2.17 2.37 ± 0.47
2011-09-23 55827.2513 NACO −255.68 ± 2.68 136.75 ± 2.68 2.12 2.55 ± 0.50
2011-09-23 55827.2524 NACO −255.20 ± 2.67 135.85 ± 2.67 1.75 2.16 ± 0.42
2011-09-23 55827.2535 NACO −255.44 ± 2.74 136.65 ± 2.74 1.64 2.30 ± 0.46
2011-10-04 55838.2645 NACO −254.59 ± 2.66 137.88 ± 2.66 2.17 2.68 ± 0.51
2011-10-04 55838.2660 NACO −254.27 ± 2.66 138.04 ± 2.66 2.12 2.79 ± 0.53
2011-10-04 55838.2673 NACO −253.79 ± 2.66 136.67 ± 2.66 1.75 3.15 ± 0.56
2011-10-04 55838.2684 NACO −253.80 ± 2.67 137.26 ± 2.67 1.64 2.58 ± 0.47
2011-10-04 55838.2697 NACO −253.07 ± 2.70 135.40 ± 2.70 1.28 2.71 ± 0.50
2011-10-04 55838.2709 NACO −254.43 ± 2.74 135.72 ± 2.75 1.26 2.47 ± 0.48
2011-10-04 55838.2721 NACO −253.74 ± 2.68 136.47 ± 2.68 1.24 2.71 ± 0.46
2011-10-04 55838.2733 NACO −252.47 ± 2.76 136.15 ± 2.76 1.09 2.25 ± 0.41
2011-10-04 55838.2746 NACO −253.35 ± 2.88 137.56 ± 2.88 1.08 2.23 ± 0.44
2011-10-04 55838.2758 NACO −251.65 ± 2.81 137.89 ± 2.81 1.04 2.37 ± 0.45
2011-11-20 55885.0603 NACO −252.09 ± 2.66 143.42 ± 2.66 2.17 2.58 ± 0.49
2011-11-20 55885.0631 NACO −251.86 ± 2.66 144.27 ± 2.66 2.17 2.56 ± 0.48
2012-08-12 56151.3938 NACO −234.42 ± 2.66 179.37 ± 2.66 2.17 2.50 ± 0.52
2012-08-12 56151.3958 NACO −234.15 ± 2.66 179.13 ± 2.66 2.12 2.52 ± 0.52
2012-08-12 56151.3971 NACO −234.27 ± 2.66 179.21 ± 2.66 1.75 2.29 ± 0.43
2012-08-12 56151.3991 NACO −233.24 ± 2.66 180.07 ± 2.66 1.28 2.13 ± 0.67
2012-08-12 56151.4013 NACO −233.47 ± 2.68 175.71 ± 2.68 1.26 2.20 ± 0.74
2012-08-12 56151.4033 NACO −234.24 ± 2.73 178.45 ± 2.73 1.09 1.86 ± 0.78
2012-08-12 56151.4045 NACO −234.85 ± 2.71 175.90 ± 2.72 1.08 1.87 ± 0.51
2012-08-12 56151.4056 NACO −232.32 ± 2.71 177.83 ± 2.71 1.04 1.91 ± 0.67
2012-08-25 56164.3359 NACO −232.59 ± 2.66 180.17 ± 2.66 2.17 2.56 ± 0.49
2012-08-25 56164.3371 NACO −235.44 ± 2.70 196.32 ± 2.78 2.12 2.95 ± 0.76 •
2012-08-25 56164.3382 NACO −232.24 ± 2.65 180.53 ± 2.65 1.75 2.68 ± 0.50
2012-08-25 56164.3392 NACO −231.06 ± 2.67 180.82 ± 2.67 1.64 2.52 ± 0.42
2012-08-25 56164.3402 NACO −230.96 ± 2.68 182.47 ± 2.68 1.28 2.26 ± 0.45
2012-08-25 56164.3412 NACO −230.13 ± 2.72 183.38 ± 2.72 1.26 2.39 ± 0.47
2012-08-25 56164.3432 NACO −232.20 ± 2.74 182.86 ± 2.74 1.09 2.56 ± 0.59
2012-08-25 56164.3444 NACO −230.06 ± 2.71 182.51 ± 2.71 1.08 2.78 ± 0.51
2012-12-07 56268.0620 NACO −219.09 ± 2.65 189.35 ± 2.65 2.17 2.44 ± 0.45
2012-12-07 56268.0634 NACO −219.87 ± 2.65 189.78 ± 2.65 2.12 2.50 ± 0.47
2012-12-07 56268.0649 NACO −219.55 ± 2.65 189.85 ± 2.65 1.75 2.43 ± 0.43
2012-12-07 56268.0663 NACO −219.50 ± 2.66 189.73 ± 2.66 1.64 2.39 ± 0.45
2012-12-07 56268.0679 NACO −218.80 ± 2.67 190.21 ± 2.67 1.28 2.39 ± 0.53
2012-12-07 56268.0695 NACO −219.19 ± 2.69 189.99 ± 2.69 1.26 2.59 ± 0.54
2012-12-07 56268.0711 NACO −219.34 ± 2.67 188.59 ± 2.67 1.24 2.68 ± 0.55
2012-12-07 56268.0726 NACO −221.12 ± 2.76 189.33 ± 2.76 1.09 2.17 ± 0.57
2012-12-07 56268.0742 NACO −219.69 ± 2.69 188.77 ± 2.69 1.08 2.15 ± 0.43
2012-12-07 56268.0757 NACO −222.43 ± 2.69 185.43 ± 2.69 1.04 2.56 ± 0.90
2015-10-09 57304.1001 SPHERE 44.61 ± 1.22 −12.91 ± 2.34 0.8168 1.48 ± 0.68
2015-10-09 57304.1001 SPHERE 48.01 ± 2.26 −15.39 ± 2.15 0.554 0.10 ± 0.44 •
2015-10-09 57304.1090 SPHERE 47.90 ± 4.28 −12.41 ± 4.12 0.6556 0.33 ± 0.50 •
2015-10-09 57304.1090 SPHERE 47.55 ± 1.86 −14.65 ± 1.86 0.6449 0.61 ± 0.50 •
2015-11-10 57336.1727 SPHERE 27.94 ± 0.92 −42.77 ± 1.06 0.8168 1.31 ± 0.41
2015-11-10 57336.1727 SPHERE 29.20 ± 1.16 −41.21 ± 1.13 0.554 1.47 ± 0.41
2015-11-10 57336.1855 SPHERE 31.90 ± 2.68 −46.81 ± 4.09 0.6556 0.97 ± 0.23 •
2015-11-10 57336.1855 SPHERE 30.12 ± 1.53 −43.52 ± 1.63 0.6449 1.12 ± 0.34
2015-11-17 57343.0441 SPHERE 23.48 ± 1.03 −49.88 ± 1.06 0.8168 0.19 ± 0.44 •
2015-11-17 57343.0441 SPHERE 26.20 ± 1.31 −45.97 ± 1.17 0.554 0.88 ± 0.66 •
2015-11-17 57343.0591 SPHERE 24.42 ± 1.59 −47.29 ± 1.22 0.6449 0.68 ± 0.42 •
2015-11-17 57343.0591 SPHERE 24.33 ± 1.38 −47.86 ± 1.28 0.6556 0.46 ± 0.38 •
2015-11-18 57344.0226 SPHERE 19.83 ± 0.98 −50.16 ± 0.84 0.8168 0.52 ± 0.43 •
2015-11-18 57344.0226 SPHERE 22.94 ± 0.91 −46.02 ± 0.82 0.554 0.47 ± 0.42 •
2015-11-27 57353.1197 SPHERE 12.32 ± 1.47 −51.64 ± 1.43 0.8168 1.45 ± 0.57
2015-11-27 57353.1197 SPHERE 16.30 ± 1.70 −48.72 ± 1.20 0.554 1.33 ± 0.47
2015-11-27 57353.1330 SPHERE 14.04 ± 1.65 −48.10 ± 1.92 0.6556 1.09 ± 0.51
2015-11-27 57353.1330 SPHERE 14.03 ± 1.11 −50.37 ± 1.11 0.6449 1.31 ± 0.44
2016-10-12 57674.7517 PIONIER −162.70 ± 1.60 −13.90 ± 1.40 1.64 1.23 ± 0.27
2016-11-11 57705.5752 PIONIER −174.60 ± 1.60 −6.60 ± 1.50 1.64 0.71 ± 0.32
2016-11-21 57713.4683 GRAVITY −174.24 ± 0.02 −4.79 ± 0.05 2.17 1.61 ± 0.76
2019-11-22 58749.0833 MATISSE −227.70 ± 2.00 184.39 ± 2.00 3.50

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