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Fotometría del cúmulo M6

Hemos obtenido las magnitudes aparentes de las estrellas del cúmulo M6 detectadas tomando dos estrellas de referencia, HD 318112 y HD 318118, y promediando las correcciones necesarias para convertir las magnitudes instrumentales en normalizadas. Hemos elegido estas dos componentes porque sus magnitudes publicadas en SIMBAD son medidas y no estimadas, y promediamos para disminuir el error de cálculo.

 

En la siguiente tabla aparecen reflejadas las magnitudes aparentes publicadas en SIMBAD, las magnitudes instrumentales calculadas a partir de los flujos medidos por la CCD del telescopio LCO y las magnitudes normalizadas tomando como referencia las magnitudes publicadas en SIMBAD para HD 31812 y HD 318118.

 
MAIN_ID B_Simbad V_Simbad B_inst V_inst B_nor V_nor
HD 318129 10.37 10.28 -13.72 -15.04 10.41 10.29
HD 160189 8.11 8.1 -16.11 -17.08 8.02 8.25
UCAC4 288-134576 14,333 13,583 -9.57 -11.65 14.55 13.69
UCAC4 288-134658 13.91 13,211 -9.95 -12.01 14.17 13.33
UCAC4 288-134753 12,258 11.72 -11.8 -13.58 12.32 11.75
CD-32 13079 11.1 10.6 -13.42 -14.79 10.7 10.55
UCAC4 289-128729 14,195 13,491 -9.67 -11.74 14.45 13.59
HD 318127 9.88 9.82 -14.25 -15.51 9.87 9.82
UCAC4 289-128776 13,752 13,093 -10.16 -12.16 13.96 13.18
CD-32 13118 10.9 10.8 -13.02 -14.48 11.1 10.86
NGC 6405 116 12.97 12.41 -11.0 -12.84 13.13 12.49
CPD-32 4688 11.44 11.14 -12.65 -14.16 11.48 11.18
HD 160167 8.69 8.68 -15.53 -16.54 8.6 8.8
UCAC4 289-128733 14,642 13,806 -9.08 -11.32 15.04 14.02
NGC 6405 119 12.69 12.08 -11.38 -13.18 12.75 12.16
CPD-32 4693 11.34 10.94 -12.7 -14.36 11.42 10.98
UCAC4 289-128844 14,691 13.92 -9.08 -11.24 15.04 14.09
Cl* NGC 6405 A 42087 12.83 12.26 -11.15 -13.05 12.97 12.29
HD 318120 10.18 10.01 -14.01 -15.38 10.12 9.95
UCAC4 289-129024 14,731 13,852 -9.02 -11.36 15.1 13.98
HD 318126 9.51 9.41 -14.68 -15.86 9.44 9.47
UCAC4 289-128738 12,714 12,209 -11.25 -13.06 12.87 12.28
HD 160222 8.52 8.46 -15.61 -16.58 8.52 8.75
Gaia EDR3 4054217031732486016 -10.08 -11.98 14.04 13.36
NGC 6405 98 12.77 12.2 -11.1 -12.98 13.02 12.36
HD 160298 8.8 8.77 -15.41 -16.42 8.71 8.91
HD 318110 9 8.96 -15.13 -16.2 8.99 9.14
NGC 6405 89 11.71 11.36 -12.41 -13.99 11.71 11.34
V* V994 Sco 7.13 7.16 -16.78 -17.81 7.35 7.53
HD 318112 9.51 9.48 -14.59 -15.77 9.54 9.56
NGC 6405 91 12.46 11.98 -11.59 -13.35 12.54 11.99
HD 318113 10.25 10.17 -13.85 -15.16 10.27 10.18
HD 318119 10.55 10.4 -13.6 -14.95 10.52 10.39
CPD-32 4689 11.56 10.97 -12.47 -14.02 11.66 11.32
CPD-32 4724 10.94 10.71 -13.16 -14.58 10.96 10.75
UCAC4 289-128875 -11.08 -12.91 13.04 12.43
CPD-32 4687 10.41 10.17 -13.75 -15.17 10.38 10.17
V* V970 Sco 9.38 9.34 -14.81 -15.92 9.31 9.42
HD 318111 9,538 9,431 -14.6 -15.77 9.53 9.57
Gaia EDR3 4054220673879115008 -8.52 -10.87 15.6 14.46
CPD-32 4739 11.58 11.26 -12.46 -14.04 11.67 11.3
HD 318108 9.73 9.66 -14.4 -15.61 9.73 9.72
HD 318118 10.29 10.27 -13.86 -15.15 10.26 10.19
HD 318114 10.33 10.23 -13.82 -15.12 10.31 10.22
UCAC4 289-128705 -12.41 -13.98 11.71 11.36
NGC 6405 68 12.42 11.97 -11.53 -13.33 12.6 12.01
UCAC4 289-128768 14,317 13,579 -9.43 -11.64 14.69 13.69
NGC 6405 69 12.52 11.99 -11.36 -13.2 12.77 12.14
UCAC4 289-128885 14,504 13,773 -9.12 -11.34 15.01 13.99
UCAC4 289-128675 13,535 12,905 -10.42 -12.36 13.71 12.98
UCAC4 289-128826 -9.31 -11.52 14.81 13.82
CD-32 13106 10.32 10.2 -13.77 -15.12 10.35 10.22
HD 160260 8.41 8.36 -15.78 -16.75 8.34 8.58
CD-32 13092 10.11 10.01 -13.98 -15.28 10.15 10.05
NGC 6405 65 13.21 12.62 -10.8 -12.64 13.32 12.7
UCAC4 289-128642 14,217 13,377 -9.63 -11.84 14.5 13.5
UCAC4 289-128706 14,464 13,604 -9.24 -11.57 14.89 13.77
HD 160221 7.22 7.24 -16.69 -17.73 7.43 7.6
UCAC4 289-128968 11,742 11,403 -12.34 -13.92 11.79 11.41
CPD-32 4718 12.3 -10.32 -12.3 13.81 13.04
NGC 6405 66 12.75 12.29 -11.22 -13.03 12.9 12.3
UCAC4 289-128697 14,464 13.75 -9.34 -11.51 14.78 13.83
NGC 6405 131 12.51 11.96 -11.59 -13.32 12.54 12.01
UCAC4 289-128633 13,468 12,845 -10.52 -12.45 13.61 12.88
UCAC4 289-128770 15,227 14,289 -8.61 -10.88 15.51 14.45
UCAC4 289-128654 13,781 12,925 -10.12 -12.25 14.01 13.08
CD-32 13097 10.18 10.05 -14.01 -15.32 10.12 10.02
NGC 6405 45 14.98 14.07 -8.96 -11.2 15.17 14.13
CD-32 13126 10.81 10.62 -13.26 -14.7 10.86 10.64
NGC 6405 50 14.67 13.93 -9.22 -11.32 14.91 14.02
NGC 6405 40 13.35 12.8 -10.35 -12.33 13.77 13.01
HD 318115 9.17 9.08 -14.99 -16.06 9.14 9.28
CD-32 13093 10.38 10.25 -13.77 -15.09 10.35 10.24
NGC 6405 43 12.03 11.55 -12.02 -13.72 12.1 11.61
HD 318116 10.1 -13.86 -15.26 10.26 10.07
HD 318117 8.85 8.87 -15.38 -16.38 8.75 8.96
CD-32 13089 10.15 9.87 -14.05 -15.46 10.07 9.88
CPD-32 4713 10.85 10.62 -13.25 -14.71 10.87 10.63
CD-32 13109 10.63 10.53 -13.47 -14.83 10.65 10.51
V* BM Sco 7.2 5.6 -16.3 -18.78 7.82 6.55
NGC 6405 39 14.55 13.85 -8.75 -11.05 15.37 14.29
Cl* NGC 6405 E 32c 13.32 12.69 -10.68 -12.59 13.44 12.75
HD 318094 10.79 10.6 -13.33 -14.73 10.79 10.61
HD 160202 6.79 6.75 -17.18 -18.23 6.95 7.1
HD 160297 9.07 9.02 -15.18 -16.26 8.95 9.08
NGC 6405 38 13.89 13.21 -10.02 -11.95 14.11 13.39
Cl* NGC 6405 E 31e 15.38 14.45 -8.47 -10.76 15.65 14.58
Cl* NGC 6405 E 31c 15.26 14.21 -8.52 -10.97 15.61 14.36
NGC 6405 24 13.53 12.56 -10.57 -12.71 13.56 12.62
HD 318093B 10.79 10.46 -14.96 -16.11 9.16 9.22
HD 318093A 9.04 8.9 -14.96 -16.11 9.16 9.22
HD 318099 9.92 9.86 -14.22 -15.47 9.91 9.87
HD 160259 9.11 9.48 -15.35 -16.45 8.78 8.89
HD 160259A -15.35 -16.45 8.78 8.89
HD 160259B 10.33 10.27 -15.35 -16.45 8.78 8.89
NGC 6405 26 12.26 11.8 -11.81 -13.53 12.32 11.81
UCAC4 290-133870 -9.28 -11.43 14.84 13.91
HD 318092 9.54 9.39 -14.61 -15.84 9.51 9.5
HD 160166 9.21 9.13 -15.04 -16.13 9.09 9.21
NGC 6405 27 13.17 12.56 -10.8 -12.73 13.32 12.61
UCAC4 290-133461 13,036 12,474 -10.97 -12.82 13.16 12.52
NGC 6405 18 12.81 12.27 -11.2 -13.04 12.93 12.29
HD 318101 8.24 8.3 -15.89 -16.85 8.23 8.49
UCAC4 290-133574 13,941 13,251 -10.19 -12.17 13.93 13.16
HD 160392 9.15 9.11 -15.09 -16.23 9.03 9.1
V* V971 Sco 9.88 9.81 -14.34 -15.56 9.79 9.78
UCAC4 290-133807 14,882 13,977 -8.93 -11.12 15.2 14.22
HD 160335 7.21 7.24 -16.77 -17.81 7.36 7.53
UCAC4 290-133485 13,854 13,194 -10.05 -12.09 14.07 13.25
UCAC4 290-133778 14,231 13,538 -9.69 -11.77 14.43 13.56
NGC 6405 14 12.2 11.76 -11.86 -13.55 12.26 11.78
NGC 6405 12 12.41 11.9 -11.65 -13.35 12.47 11.98
Gaia EDR3 4054974934504146048 -8.18 -10.58 15.94 14.76
HD 318095 10.68 10.55 -13.42 -14.79 10.7 10.54
UCAC4 290-133500 14,011 13,276 -9.89 -11.93 14.23 13.41
UCAC4 290-133511 14,507 13,697 -9.37 -11.51 14.76 13.83
UCAC4 290-133568 13,168 12,602 -10.82 -12.69 13.3 12.64
NGC 6405 6 13.43 12.81 -10.57 -12.49 13.55 12.85
CD-32 13119 11.18 10.94 -13.0 -14.48 11.12 10.85
HD 318091 10.8 10.5 -13.45 -14.83 10.67 10.51
HD 318102 8.87 8.77 -13.85 -15.16 10.27 10.17
NGC 6405 322 11.8 11.25 -12.38 -14.15 11.74 11.19
UCAC4 290-133868 15,251 14,342 -8.65 -10.86 15.48 14.47
Gaia EDR3 4055069428083885952 -8.37 -10.76 15.76 14.58
HD 160188 9.31 9.3 -14.85 -16.06 9.27 9.27

Tabla 1: Magnitudes aparentes publicadas en SIMBAD, instrumentales y normalizadas de las estrellas de M6.

 

 

B_Simbad V_Simbad B_LCO V_LCO ΔB ΔV

HD 318112

9,51

9,48

-14,59

-15,77

24,10

25,25

HD 318118

10,29

10,27

-13,86

-15,15

24,15

25,42

Media

24,12

25,34
Tabla 2: Factores de normalización para las magnitudes B y V de las estrellas de M6. Se toman dos estrellas de referencia para la fotometría diferencial y se promedian las correcciones.

 

La distribución de magnitudes B y V en M6, así como su relación, aparecen reflejadas gráficamente en las siguientes figuras.

 

Fig 1: Distribución de magnitudes V normalizadas en M6.

 

Fig 2: Distribución de magnitudes B normalizadas en M6.

 

Fig 3: Relación de magnitudes V y B normalizadas en M6.

 

 

 

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