2002MNRAS.335..291N

Query : 2002MNRAS.335..291N

2002MNRAS.335..291N - Mon. Not. R. Astron. Soc., 335, 291-310 (2002/September-2)

Optimal photometry for colour-magnitude diagrams and its application to NGC 2547.

NAYLOR T., TOTTEN E.J., JEFFRIES R.D., POZZO M., DEVEY C.R. and THOMPSON S.A.

Abstract (from CDS):

We have developed the techniques required to use Naylor's optimal photometry algorithm of to create colour-magnitude diagrams with well-defined completeness functions. To achieve this we first demonstrate that the optimal extraction is insensitive to uncertainties in the measured position of the star. We then show how to correct the optimally extracted fluxes such that they correspond to those measured in a large aperture, so aperture photometry of standard stars can be used to place the measurements on a standard system. The technique simultaneously removes the effects of a position-dependent point spread function. Finally, we develop a method called `ghosting', which calculates the completeness corrections in the absence of an accurate description of the point spread function.

We apply these techniques to the young cluster NGC 2547 (=C0809-491), and use an X-ray-selected sample to find an age of 20-35 Myr and an intrinsic distance modulus of 8.00-8.15 mag. We use these isochrones to select members from our photometric surveys. Our derived luminosity function shows a well-defined Wielen dip, making NGC 2547 the youngest cluster in which such a feature has been observed. Our derived mass function spans the range 0.1-6 M☉ and is similar to that for the field and the older, more massive clusters M35 and the Pleiades, supporting the idea of a universal initial mass function.


Abstract Copyright: RAS

Journal keyword(s): methods: data analysis - techniques: image processing - techniques: photometric - stars: formation - stars: pre-main-sequence - open clusters and associations: individual: NGC 2547

VizieR on-line data: <Available at CDS (J/MNRAS/335/291): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat>

Nomenclature: Tables 2-5: Cl* NGC 2547 NTJ NN-NNNN N=102+16649+25472+31880.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 107

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Number of rows : 107
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 188 OpC 00 47 11.5 +85 14 38           ~ 922 0
2 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3435 0
3 NGC 2168 OpC 06 09 05.3 +24 20 10           ~ 558 0
4 NGC 2516 OpC 07 58 06.5 -60 48 00           ~ 713 0
5 V* KW Vel a2* 08 08 41.6077338984 -49 29 50.021182608   8.13 8.23     ApSi 56 0
6 CD-49 3371 * 08 08 45.7097505552 -49 23 47.410193724   10.78 10.64 10.67 10.29 ~ 30 0
7 HD 68114 * 08 08 49.8143090808 -49 13 43.670938044   9.45 9.41     A0V 31 0
8 NGC 2547 71 * 08 08 50.3685956016 -49 16 16.301801460   11.89 11.45 11.098 10.825 ~ 12 0
9 HD 68115 * 08 08 53.1025574160 -49 13 49.251464580   9.76 9.66     A0V 27 0
10 CD-48 3513 * 08 09 02.8339411800 -49 16 09.520301208   11.73 11.52     ~ 8 0
11 CD-48 3518 * 08 09 14.0187185136 -49 04 03.066564000   11.81 11.45   10.99 ~ 15 0
12 HD 68244 * 08 09 23.6836013352 -49 10 46.654405824   8.78 8.64     A2/3V 18 0
13 HD 68274 * 08 09 26.0289040656 -49 11 55.247695656   9.02 9.04     B9 24 0
14 CPD-48 1496 * 08 09 26.6857435584 -49 14 37.169068704   11.26 10.94     ~ 30 0
15 CD-49 3379 V* 08 09 28.1612977656 -49 25 57.947447100   10.60 9.47     K2 10 0
16 CD-48 3524 * 08 09 29.5861187448 -49 06 16.637911200   10.37 10.22     A2V 17 0
17 CD-48 3526 V* 08 09 30.5284696032 -49 20 44.364610572   11.41 11.04   10.65 ~ 29 0
18 HD 68275 * 08 09 30.5288505336 -49 21 56.287578636   10.25 10.04     A3(m) 27 0
19 CD-49 3381 * 08 09 35.6089726320 -49 27 01.633491252   11.28 10.83     ~ 15 0
20 HD 68305 ** 08 09 36.7078 -49 11 38.186   8.94 8.88     A1V 20 0
21 CD-48 3530 ** 08 09 38.185200 -49 18 40.35924   10.69 10.39 10.45 10.495 A9V 12 0
22 CD-48 3533 V* 08 09 46.0997949960 -49 14 26.981155536   11.03 10.73   10.336 ~ 19 0
23 NGC 2547 73 * 08 09 47.3089863576 -49 19 42.538869840   12.82 11.49     ~ 3 0
24 NGC 2547 97 * 08 09 47.3135342256 -49 13 05.167909056   13.02 12.39 11.931 11.603 ~ 17 0
25 CD-48 3536 * 08 09 48.9349188432 -49 09 37.045203516   11.33 10.93     ~ 13 0
26 CD-49 3384 V* 08 09 49.1709883128 -49 25 04.716038784   11.36 9.70     ~ 8 0
27 CD-48 3535 * 08 09 49.5496238688 -49 01 49.343737692   10.55 9.48     K0 12 0
28 CD-48 3539 * 08 09 50.5971925272 -49 13 19.412738544   10.84 10.59     A0 20 0
29 CD-48 3537 * 08 09 50.6616837264 -49 12 49.340231496   10.39 10.22     A3IV 21 0
30 CD-48 3540 * 08 09 51.3453010776 -49 11 15.268311888   9.403 9.291     ~ 23 0
31 CD-48 3538 * 08 09 51.9155220408 -49 00 25.080501744   10.90 10.75     ~ 7 0
32 CD-48 3541 * 08 09 52.2146090976 -49 11 02.317127496   9.73 9.67     A2VnkA0mA1 24 0
33 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 400 0
34 HD 68398 * 08 09 56.0015395224 -49 19 29.975884608   8.66 8.63     B9V 28 0
35 HD 68396 EB* 08 09 57.5328590400 -49 08 20.222536092   8.85 8.86 8.94   A0Vn 36 0
36 HD 68397 * 08 09 59.2156731840 -49 16 10.934990148   8.14 8.14     B7/9V 35 0
37 CPD-48 1515 * 08 10 00.8714622024 -49 08 32.437351716   11.57 11.10   10.403 ~ 13 0
38 NGC 2547 84 * 08 10 01.4319087864 -48 58 25.176192564   12.26 12.03     ~ 3 0
39 NGC 2547 105 * 08 10 01.67 -49 22 06.2   14.01 12.84     ~ 2 0
40 CD-48 3547 CV* 08 10 06.0739176720 -49 14 18.083781384   9.97 9.88 9.83   A1V 32 0
41 HD 68432 * 08 10 07.8599431008 -49 16 35.879719908 7.99 8.33 8.42     B8/9III/IV 30 0
42 HD 68420 * 08 10 08.4167952600 -49 00 43.434903816   9.93 9.84 9.94   A3V 28 0
43 NGC 2547 100 * 08 10 09.2777978256 -49 20 53.927500884   13.13 12.52   11.68 ~ 10 0
44 NGC 2547 76 * 08 10 11.6497530912 -49 22 27.464992500   12.19 11.64   10.966 ~ 12 0
45 2MASS J08101223-4913056 Y*O 08 10 12.2262943584 -49 13 05.656971324   13.116 12.542 12.176 11.866 ~ 26 0
46 CD-48 3550 * 08 10 13.5188127000 -49 20 43.824972516   11.48 11.05   10.364 ~ 12 0
47 CD-48 3551 * 08 10 13.5448420896 -49 19 13.052335692   10.685 10.288 10.277   F0 20 0
48 NGC 2547 110 * 08 10 15.4139690760 -49 11 09.544291656   14.04 13.25   12.32 ~ 10 0
49 HD 68451 * 08 10 16.0818194232 -49 02 05.711778132 6.56 7.19 7.32 7.36   B5II 50 0
50 NGC 2547 77 * 08 10 16.6274012880 -49 21 32.521467528   13.42 11.66     ~ 2 0
51 CPD-48 1523 * 08 10 16.7320268160 -49 15 17.302422384   11.35 11.02     ~ 18 0
52 NGC 2547 80 * 08 10 18.3625080432 -49 06 46.193950728   12.48 11.90   11.21 ~ 11 0
53 NGC 2547 91 * 08 10 20.1286141176 -49 09 38.471537412   13.58 12.25     ~ 2 0
54 HD 68478 * 08 10 20.5684356576 -49 14 14.494042104 5.65 6.300 6.447     B3III/IV 51 0
55 HD 68452 * 08 10 20.8176670392 -49 03 36.714635604   9.34 9.29     A1V 37 0
56 CD-48 3553 * 08 10 23.0409305064 -49 00 30.075204456   12.50 12.27     ~ 3 0
57 CD-49 3390 * 08 10 24.3978952608 -49 23 17.284596108   11.19 10.93     ~ 13 0
58 NGC 2547 108 * 08 10 24.5390678760 -49 08 48.670739124   13.79 13.21     ~ 3 0
59 2MASS J08102486-4901495 Y*O 08 10 24.8681124264 -49 01 49.531938348   13.47 12.66 12.305 11.933 ~ 25 0
60 NGC 2547 85 * 08 10 25.2403095120 -49 18 58.586420124   12.66 12.04     ~ 4 0
61 2MASS J08102576-4908124 Y*? 08 10 25.7659417272 -49 08 12.496964892   14.31 13.37 12.957 12.373 ~ 10 0
62 CD-48 3558 * 08 10 26.6718346320 -49 06 53.320385700   10.69 10.55   10.234 A7V 23 0
63 2MASS J08102704-4908487 Y*O 08 10 27.0453548256 -49 08 48.807005532   14.09 13.24 12.73 12.373 ~ 27 0
64 NGC 2547 95 * 08 10 27.1207049352 -49 11 50.307821700   13.363 12.281     ~ 7 0
65 NGC 2547 69 * 08 10 27.1571966832 -49 10 28.989398496   12.27 11.16     ~ 2 0
66 HD 68496 * 08 10 27.2436784248 -49 09 50.928876288   7.81 7.88 7.92   B5/7V 47 0
67 CD-48 3559 * 08 10 27.7407576480 -49 12 09.580785660   11.48 11.00     ~ 10 0
68 NGC 2547 112 * 08 10 29.3603188536 -49 08 02.364422280   13.72 13.31     ~ 3 0
69 NGC 2547 90 * 08 10 29.5223516880 -49 09 00.497839644   13.508 12.135     ~ 6 0
70 HD 68495 * 08 10 31.4497407456 -49 06 30.186840024   9.55 9.45     B9 38 0
71 CD-48 3563 ** 08 10 31.530936 -49 16 43.73220   11.18 10.72 11.05   ~ 14 0
72 NGC 2547 115 * 08 10 33.2338463064 -49 07 38.521380972   14.80 13.42     ~ 2 0
73 NGC 2547 106 * 08 10 33.8050284840 -49 11 24.685208664   13.99 12.86     ~ 3 0
74 NGC 2547 89 * 08 10 34.3197518232 -49 00 49.634969256   12.63 12.17   11.42 ~ 11 0
75 2MASS J08103470-4908399 Y*O 08 10 34.7071349760 -49 08 40.033783140   12.931 12.390 12.092 11.703 ~ 26 0
76 NGC 2547 116 * 08 10 34.8350603736 -49 08 17.428257528   14.00 13.51     ~ 3 0
77 NGC 2547 81 * 08 10 35.2939203744 -49 06 28.081495944   12.20 11.96     ~ 2 0
78 CD-48 3564 * 08 10 35.9305604856 -49 18 21.285338328   10.36 10.05     A5IV 22 0
79 CD-48 3565 * 08 10 38.9942726472 -49 01 48.875088864   10.22 10.32     B9 7 0
80 NGC 2547 79 * 08 10 39.8299836120 -49 04 37.764065460   12.26 11.77   10.99 ~ 11 0
81 NGC 2547 75 * 08 10 40.0540283400 -49 17 47.067061776   12.81 11.63     ~ 3 0
82 NGC 2547 118 * 08 10 40.3645991904 -49 21 50.850531108   14.66 13.98     ~ 2 0
83 HD 68558 * 08 10 42.3317758392 -48 57 25.302576960   9.89 9.80     A0V 32 0
84 2MASS J08104546-4901068 Y*O 08 10 45.4575224376 -49 01 06.821384592   12.85 12.11   11.506 ~ 25 0
85 CD-48 3569 * 08 10 46.6158979752 -49 17 31.318941012   11.29 10.83   10.220 ~ 23 0
86 NGC 2547 109 * 08 10 48.1581528384 -49 23 38.510783520   13.94 13.22     ~ 3 0
87 HD 68559 * 08 10 48.7265598864 -49 06 51.517978560   10.51 10.15     F0/2IV/V 14 0
88 2MASS J08104984-4911258 Y*O 08 10 49.8496128120 -49 11 25.861858188   12.238 11.769   11.165 ~ 20 0
89 NGC 2547 101 * 08 10 56.5757478480 -49 09 00.419244336   12.98 12.55     ~ 4 0
90 NGC 2547 96 * 08 10 57.8987968512 -49 18 15.630096384   13.89 12.33     ~ 3 0
91 NGC 2547 103 * 08 10 58.5484746552 -49 08 25.883833740   13.83 12.78     ~ 3 0
92 HD 68608 * 08 10 59.5499675112 -49 17 03.870082212 7.25 7.77 7.88     B7III 52 0
93 2MASS J08110009-4906442 Y*O 08 11 00.0968303568 -49 06 44.269894692   14.03 13.29 12.87 12.48 ~ 22 0
94 NGC 2547 98 * 08 11 00.6743801424 -49 15 14.689023336   13.840 12.343     ~ 7 0
95 CD-48 3575 * 08 11 03.2334284232 -49 00 37.445033088   11.24 10.92     ~ 29 0
96 NGC 2547 117 * 08 11 03.4681869384 -49 13 26.316030720   14.20 13.59     ~ 2 0
97 NGC 2547 107 * 08 11 05.2269317856 -49 13 40.221970716   13.46 13.00     ~ 3 0
98 NGC 2547 78 * 08 11 05.6163505512 -49 03 19.153495044   12.73 11.72     ~ 3 0
99 HD 68631 * 08 11 08.6023793928 -49 00 16.116822000   10.08 9.96     A1/2IV/V 30 0
100 CD-48 3578 * 08 11 11.3426703216 -49 04 44.292598536   11.44 11.09   10.60 ~ 29 0
101 NGC 2547 93 * 08 11 11.5833961608 -49 05 21.036056460   14.02 12.28     ~ 3 0
102 NGC 2547 86 * 08 11 17.4287674608 -49 06 15.079286808   13.08 12.06     ~ 3 0
103 2MASS J08112074-4913100 Y*O 08 11 20.7374704248 -49 13 10.012706148   12.64 12.02 11.75 11.37 ~ 11 0
104 NGC 2547 70 * 08 11 22.3263928608 -49 09 14.554361808   12.515 11.134     ~ 7 0
105 HD 68698 EB* 08 11 25.8583913304 -49 12 28.862441280   9.90 9.86     A1V 32 0
106 NGC 2547 88 * 08 11 28.8511788432 -49 10 52.429788480   12.61 12.15     ~ 3 0
107 CD-49 3401 ** 08 11 37.8338782440 -49 29 36.602787408   11.297 10.857 10.820   ~ 8 0

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