Índice de color (B-V)o y temperatura en M6

A partir de los valores obtenidos para las magnitudes aparentes B y V de las estrellas del cúmulo M6, hemos calculado el índice de color B-V para cada una de ellas y le hemos aplicado un exceso de color  extraída del artículo de T. KılıçoĞlu, 2016. Hay una relación clara entre la temperatura superficial T y su índice de color B–V (ver Reed, C., 1998, Journal of the Royal Society of Canada, 92, 36-37) de manera que podemos encontrar la temperatura superficial de una estrella usando la expresión:

log10(T) = (14.551 – (B – V) )/ 3.684
 
MAIN_IDD(pc)BVB-V(B-V)olog(T)
HD 318129458.442210.4110.290.12-0.033.96
HD 160189453.06278.028.25-0.24-0.394.05
UCAC4 288-134576456.725314.5513.690.860.713.76
UCAC4 288-134658455.643114.1713.330.850.73.76
UCAC4 288-134753465.462712.3211.750.570.423.84
CD-32 13079470.278410.710.550.160.013.95
UCAC4 289-128729459.157914.4513.590.860.713.76
HD 318127454.13269.879.820.05-0.13.98
UCAC4 289-128776447.707713.9613.180.780.633.78
CD-32 13118445.75211.110.860.250.13.92
NGC 6405 116454.607413.1312.490.630.483.82
CPD-32 4688464.813611.4811.180.30.153.91
HD 160167463.54248.68.8-0.2-0.354.05
UCAC4 289-128733464.554515.0414.021.020.873.71
NGC 6405 119462.256712.7512.160.590.443.83
CPD-32 4693477.783111.4210.980.440.293.87
UCAC4 289-128844458.274115.0414.090.950.83.73
Cl* NGC 6405 A 42087458.022312.9712.290.690.543.8
HD 318120490.701210.129.950.160.013.95
UCAC4 289-129024449.761615.113.981.120.973.69
HD 318126466.72279.449.47-0.03-0.184.0
UCAC4 289-128738464.619212.8712.280.590.443.83
HD 160222459.91818.528.75-0.23-0.384.05
Gaia EDR3 4054217031732486016398.152614.0413.360.690.543.8
NGC 6405 98449.256513.0212.360.660.513.81
HD 160298479.27158.718.91-0.2-0.354.05
HD 318110458.27418.999.14-0.14-0.294.03
NGC 6405 89459.052511.7111.340.370.223.89
V* V994 Sco473.82147.357.53-0.18-0.334.04
HD 318112465.63619.549.56-0.03-0.184.0
NGC 6405 91454.483512.5411.990.550.43.84
HD 318113453.988310.2710.180.1-0.053.96
HD 318119481.834810.5210.390.14-0.013.95
CPD-32 4689471.364611.6611.320.340.193.9
CPD-32 4724452.550110.9610.750.210.063.93
UCAC4 289-128875452.693513.0412.430.610.463.82
CPD-32 4687457.142910.3810.170.210.063.93
V* V970 Sco464.51139.319.42-0.11-0.264.02
HD 318111457.35199.539.57-0.04-0.194.0
Gaia EDR3 4054220673879115008454.070715.614.461.140.993.68
CPD-32 4739474.113411.6711.30.370.223.89
HD 318108490.84579.739.720.01-0.143.99
HD 318118462.043210.2610.190.08-0.073.97
HD 318114459.89710.3110.220.09-0.063.97
UCAC4 289-128705458.106211.7111.360.360.213.89
NGC 6405 68459.601112.612.010.590.443.83
UCAC4 289-128768461.957814.6913.691.00.853.72
NGC 6405 69485.979512.7712.140.630.483.82
UCAC4 289-128885458.085215.0113.991.010.863.72
UCAC4 289-128675447.187213.7112.980.730.583.79
UCAC4 289-128826465.37614.8113.820.990.843.72
CD-32 13106481.811610.3510.220.13-0.023.96
HD 160260472.12128.348.58-0.24-0.394.06
CD-32 13092464.511310.1510.050.09-0.063.97
NGC 6405 65623.635813.3212.70.630.483.82
UCAC4 289-128642456.079514.513.51.00.853.72
UCAC4 289-128706443.89214.8913.771.120.973.69
HD 160221469.08727.437.6-0.17-0.324.04
UCAC4 289-128968456.412611.7911.410.370.223.89
CPD-32 4718444.681613.8113.040.770.623.78
NGC 6405 66454.132612.912.30.60.453.83
UCAC4 289-128697463.349114.7813.830.960.813.73
NGC 6405 131468.955212.5412.010.520.373.85
UCAC4 289-128633437.636813.6112.880.730.583.79
UCAC4 289-128770479.547315.5114.451.060.913.7
UCAC4 289-128654462.278114.0113.080.920.773.74
CD-32 13097468.999210.1210.020.1-0.053.96
NGC 6405 45457.896415.1714.131.030.883.71
CD-32 13126463.886410.8610.640.220.073.93
NGC 6405 50568.634114.9114.020.890.743.75
NGC 6405 40456.829613.7713.010.770.623.78
HD 318115463.07029.149.28-0.14-0.294.03
CD-32 13093467.093310.3510.240.11-0.043.96
NGC 6405 43472.299612.111.610.490.343.86
HD 318116452.038710.2610.070.190.043.94
HD 318117459.36888.758.96-0.21-0.364.05
CD-32 13089507.305210.079.880.190.043.94
CPD-32 4713456.183610.8710.630.250.13.92
CD-32 13109464.662410.6510.510.14-0.013.95
V* BM Sco491.54547.826.551.271.123.65
NGC 6405 39453.720515.3714.291.080.933.7
Cl* NGC 6405 E 32c459.200113.4412.750.690.543.8
HD 318094454.318310.7910.610.190.043.94
HD 160202543.24216.957.1-0.16-0.314.03
HD 160297468.86728.959.08-0.13-0.284.03
NGC 6405 38761.962814.1113.390.720.573.8
Cl* NGC 6405 E 31e462.620315.6514.581.080.933.7
Cl* NGC 6405 E 31c451.304315.6114.361.251.13.65
NGC 6405 24580.585213.5612.620.930.783.74
HD 318093B377.72919.169.22-0.06-0.214.01
HD 318093A530.25089.169.22-0.06-0.214.01
HD 318099472.27739.919.870.04-0.113.98
HD 160259469.83658.788.89-0.11-0.264.02
HD 160259A469.83658.788.89-0.11-0.264.02
HD 160259B463.92958.788.89-0.11-0.264.02
NGC 6405 26377.643512.3211.810.510.363.85
UCAC4 290-133870459.073614.8413.910.940.793.74
HD 318092458.42129.519.50.02-0.133.99
HD 160166441.03389.099.21-0.12-0.274.02
NGC 6405 27463.994113.3212.610.710.563.8
UCAC4 290-133461454.979813.1612.520.640.493.82
NGC 6405 18460.893212.9312.290.640.493.82
HD 318101473.41768.238.49-0.25-0.44.06
UCAC4 290-133574449.31713.9313.160.770.623.78
HD 160392456.51689.039.1-0.07-0.224.01
V* V971 Sco471.74269.799.780.01-0.143.99
UCAC4 290-133807460.193315.214.220.980.833.72
HD 160335489.04547.367.53-0.17-0.324.04
UCAC4 290-133485452.857514.0713.250.830.683.77
UCAC4 290-133778458.736614.4313.560.870.723.75
NGC 6405 14458.652512.2611.780.480.333.86
NGC 6405 12700.329212.4711.980.490.343.86
Gaia EDR3 4054974934504146048481.023615.9414.761.191.043.67
HD 318095469.902710.710.540.160.013.95
UCAC4 290-133500447.587514.2313.410.830.683.77
UCAC4 290-133511456.370914.7613.830.930.783.74
UCAC4 290-133568462.941513.312.640.660.513.81
NGC 6405 6457.184713.5512.850.70.553.8
CD-32 13119458.88411.1210.850.270.123.92
HD 318091453.885310.6710.510.170.023.95
HD 318102447.487410.2710.170.1-0.053.96
NGC 6405 322324.759711.7411.190.560.413.84
UCAC4 290-133868452.447715.4814.471.010.863.72
Gaia EDR3 4055069428083885952459.073615.7614.581.181.033.67
HD 160188392.31079.279.270.0-0.153.99

Tabla 1: Índices de color en M6. (B-V)o representa el índice corregido de acuerdo con la bibliografía.

Fig 1: Índice de color en M6.
Fig 2: Índice de color con una corrección de 0.15 en M6.

Veamos ahora la distribución de temperaturas y su relación con el índice de color:

Fig 3: Distribución de temperaturas superficiales en M6.
Fig 4: Relación temperatura superficial-índice de color en M6.

 

 

REFERENCIAS:

T. KılıçoĞlu, R. Monier,  et al. 2016.CHEMICAL COMPOSITION OF INTERMEDIATE-MASS STAR MEMBERS OF THE M6 (NGC 6405) OPEN CLUSTER. The Astronomical Journal, 151:49.

 

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