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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_ID D(pc) B V B-V (B-V)o log(T)
HD 318129 458.4422 10.41 10.29 0.12 -0.03 3.96
HD 160189 453.0627 8.02 8.25 -0.24 -0.39 4.05
UCAC4 288-134576 456.7253 14.55 13.69 0.86 0.71 3.76
UCAC4 288-134658 455.6431 14.17 13.33 0.85 0.7 3.76
UCAC4 288-134753 465.4627 12.32 11.75 0.57 0.42 3.84
CD-32 13079 470.2784 10.7 10.55 0.16 0.01 3.95
UCAC4 289-128729 459.1579 14.45 13.59 0.86 0.71 3.76
HD 318127 454.1326 9.87 9.82 0.05 -0.1 3.98
UCAC4 289-128776 447.7077 13.96 13.18 0.78 0.63 3.78
CD-32 13118 445.752 11.1 10.86 0.25 0.1 3.92
NGC 6405 116 454.6074 13.13 12.49 0.63 0.48 3.82
CPD-32 4688 464.8136 11.48 11.18 0.3 0.15 3.91
HD 160167 463.5424 8.6 8.8 -0.2 -0.35 4.05
UCAC4 289-128733 464.5545 15.04 14.02 1.02 0.87 3.71
NGC 6405 119 462.2567 12.75 12.16 0.59 0.44 3.83
CPD-32 4693 477.7831 11.42 10.98 0.44 0.29 3.87
UCAC4 289-128844 458.2741 15.04 14.09 0.95 0.8 3.73
Cl* NGC 6405 A 42087 458.0223 12.97 12.29 0.69 0.54 3.8
HD 318120 490.7012 10.12 9.95 0.16 0.01 3.95
UCAC4 289-129024 449.7616 15.1 13.98 1.12 0.97 3.69
HD 318126 466.7227 9.44 9.47 -0.03 -0.18 4.0
UCAC4 289-128738 464.6192 12.87 12.28 0.59 0.44 3.83
HD 160222 459.9181 8.52 8.75 -0.23 -0.38 4.05
Gaia EDR3 4054217031732486016 398.1526 14.04 13.36 0.69 0.54 3.8
NGC 6405 98 449.2565 13.02 12.36 0.66 0.51 3.81
HD 160298 479.2715 8.71 8.91 -0.2 -0.35 4.05
HD 318110 458.2741 8.99 9.14 -0.14 -0.29 4.03
NGC 6405 89 459.0525 11.71 11.34 0.37 0.22 3.89
V* V994 Sco 473.8214 7.35 7.53 -0.18 -0.33 4.04
HD 318112 465.6361 9.54 9.56 -0.03 -0.18 4.0
NGC 6405 91 454.4835 12.54 11.99 0.55 0.4 3.84
HD 318113 453.9883 10.27 10.18 0.1 -0.05 3.96
HD 318119 481.8348 10.52 10.39 0.14 -0.01 3.95
CPD-32 4689 471.3646 11.66 11.32 0.34 0.19 3.9
CPD-32 4724 452.5501 10.96 10.75 0.21 0.06 3.93
UCAC4 289-128875 452.6935 13.04 12.43 0.61 0.46 3.82
CPD-32 4687 457.1429 10.38 10.17 0.21 0.06 3.93
V* V970 Sco 464.5113 9.31 9.42 -0.11 -0.26 4.02
HD 318111 457.3519 9.53 9.57 -0.04 -0.19 4.0
Gaia EDR3 4054220673879115008 454.0707 15.6 14.46 1.14 0.99 3.68
CPD-32 4739 474.1134 11.67 11.3 0.37 0.22 3.89
HD 318108 490.8457 9.73 9.72 0.01 -0.14 3.99
HD 318118 462.0432 10.26 10.19 0.08 -0.07 3.97
HD 318114 459.897 10.31 10.22 0.09 -0.06 3.97
UCAC4 289-128705 458.1062 11.71 11.36 0.36 0.21 3.89
NGC 6405 68 459.6011 12.6 12.01 0.59 0.44 3.83
UCAC4 289-128768 461.9578 14.69 13.69 1.0 0.85 3.72
NGC 6405 69 485.9795 12.77 12.14 0.63 0.48 3.82
UCAC4 289-128885 458.0852 15.01 13.99 1.01 0.86 3.72
UCAC4 289-128675 447.1872 13.71 12.98 0.73 0.58 3.79
UCAC4 289-128826 465.376 14.81 13.82 0.99 0.84 3.72
CD-32 13106 481.8116 10.35 10.22 0.13 -0.02 3.96
HD 160260 472.1212 8.34 8.58 -0.24 -0.39 4.06
CD-32 13092 464.5113 10.15 10.05 0.09 -0.06 3.97
NGC 6405 65 623.6358 13.32 12.7 0.63 0.48 3.82
UCAC4 289-128642 456.0795 14.5 13.5 1.0 0.85 3.72
UCAC4 289-128706 443.892 14.89 13.77 1.12 0.97 3.69
HD 160221 469.0872 7.43 7.6 -0.17 -0.32 4.04
UCAC4 289-128968 456.4126 11.79 11.41 0.37 0.22 3.89
CPD-32 4718 444.6816 13.81 13.04 0.77 0.62 3.78
NGC 6405 66 454.1326 12.9 12.3 0.6 0.45 3.83
UCAC4 289-128697 463.3491 14.78 13.83 0.96 0.81 3.73
NGC 6405 131 468.9552 12.54 12.01 0.52 0.37 3.85
UCAC4 289-128633 437.6368 13.61 12.88 0.73 0.58 3.79
UCAC4 289-128770 479.5473 15.51 14.45 1.06 0.91 3.7
UCAC4 289-128654 462.2781 14.01 13.08 0.92 0.77 3.74
CD-32 13097 468.9992 10.12 10.02 0.1 -0.05 3.96
NGC 6405 45 457.8964 15.17 14.13 1.03 0.88 3.71
CD-32 13126 463.8864 10.86 10.64 0.22 0.07 3.93
NGC 6405 50 568.6341 14.91 14.02 0.89 0.74 3.75
NGC 6405 40 456.8296 13.77 13.01 0.77 0.62 3.78
HD 318115 463.0702 9.14 9.28 -0.14 -0.29 4.03
CD-32 13093 467.0933 10.35 10.24 0.11 -0.04 3.96
NGC 6405 43 472.2996 12.1 11.61 0.49 0.34 3.86
HD 318116 452.0387 10.26 10.07 0.19 0.04 3.94
HD 318117 459.3688 8.75 8.96 -0.21 -0.36 4.05
CD-32 13089 507.3052 10.07 9.88 0.19 0.04 3.94
CPD-32 4713 456.1836 10.87 10.63 0.25 0.1 3.92
CD-32 13109 464.6624 10.65 10.51 0.14 -0.01 3.95
V* BM Sco 491.5454 7.82 6.55 1.27 1.12 3.65
NGC 6405 39 453.7205 15.37 14.29 1.08 0.93 3.7
Cl* NGC 6405 E 32c 459.2001 13.44 12.75 0.69 0.54 3.8
HD 318094 454.3183 10.79 10.61 0.19 0.04 3.94
HD 160202 543.2421 6.95 7.1 -0.16 -0.31 4.03
HD 160297 468.8672 8.95 9.08 -0.13 -0.28 4.03
NGC 6405 38 761.9628 14.11 13.39 0.72 0.57 3.8
Cl* NGC 6405 E 31e 462.6203 15.65 14.58 1.08 0.93 3.7
Cl* NGC 6405 E 31c 451.3043 15.61 14.36 1.25 1.1 3.65
NGC 6405 24 580.5852 13.56 12.62 0.93 0.78 3.74
HD 318093B 377.7291 9.16 9.22 -0.06 -0.21 4.01
HD 318093A 530.2508 9.16 9.22 -0.06 -0.21 4.01
HD 318099 472.2773 9.91 9.87 0.04 -0.11 3.98
HD 160259 469.8365 8.78 8.89 -0.11 -0.26 4.02
HD 160259A 469.8365 8.78 8.89 -0.11 -0.26 4.02
HD 160259B 463.9295 8.78 8.89 -0.11 -0.26 4.02
NGC 6405 26 377.6435 12.32 11.81 0.51 0.36 3.85
UCAC4 290-133870 459.0736 14.84 13.91 0.94 0.79 3.74
HD 318092 458.4212 9.51 9.5 0.02 -0.13 3.99
HD 160166 441.0338 9.09 9.21 -0.12 -0.27 4.02
NGC 6405 27 463.9941 13.32 12.61 0.71 0.56 3.8
UCAC4 290-133461 454.9798 13.16 12.52 0.64 0.49 3.82
NGC 6405 18 460.8932 12.93 12.29 0.64 0.49 3.82
HD 318101 473.4176 8.23 8.49 -0.25 -0.4 4.06
UCAC4 290-133574 449.317 13.93 13.16 0.77 0.62 3.78
HD 160392 456.5168 9.03 9.1 -0.07 -0.22 4.01
V* V971 Sco 471.7426 9.79 9.78 0.01 -0.14 3.99
UCAC4 290-133807 460.1933 15.2 14.22 0.98 0.83 3.72
HD 160335 489.0454 7.36 7.53 -0.17 -0.32 4.04
UCAC4 290-133485 452.8575 14.07 13.25 0.83 0.68 3.77
UCAC4 290-133778 458.7366 14.43 13.56 0.87 0.72 3.75
NGC 6405 14 458.6525 12.26 11.78 0.48 0.33 3.86
NGC 6405 12 700.3292 12.47 11.98 0.49 0.34 3.86
Gaia EDR3 4054974934504146048 481.0236 15.94 14.76 1.19 1.04 3.67
HD 318095 469.9027 10.7 10.54 0.16 0.01 3.95
UCAC4 290-133500 447.5875 14.23 13.41 0.83 0.68 3.77
UCAC4 290-133511 456.3709 14.76 13.83 0.93 0.78 3.74
UCAC4 290-133568 462.9415 13.3 12.64 0.66 0.51 3.81
NGC 6405 6 457.1847 13.55 12.85 0.7 0.55 3.8
CD-32 13119 458.884 11.12 10.85 0.27 0.12 3.92
HD 318091 453.8853 10.67 10.51 0.17 0.02 3.95
HD 318102 447.4874 10.27 10.17 0.1 -0.05 3.96
NGC 6405 322 324.7597 11.74 11.19 0.56 0.41 3.84
UCAC4 290-133868 452.4477 15.48 14.47 1.01 0.86 3.72
Gaia EDR3 4055069428083885952 459.0736 15.76 14.58 1.18 1.03 3.67
HD 160188 392.3107 9.27 9.27 0.0 -0.15 3.99

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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