1998AJ....116.1801D

Query : 1998AJ....116.1801D

1998AJ....116.1801D - Astron. J., 116, 1801-1809 (1998/October-0)

Pre-main-sequence stars in the young galactic cluster IC 4996: a CCD photometric study.

DELGADO A.J., ALFARO E.J., MOITINHO A. and FRANCO J.

Abstract (from CDS):

The results of a UBV CCD photometric study of the cluster IC 4996 are presented. We obtain new values for the cluster parameters: E(B-V) = 0.71±0.08, V0 - MV = 11.9±0.1, and age = (7.5±3)x106 yr. The combined evidence from the photometric diagrams suggests the presence of a number of pre-main-sequence (PMS) cluster members with spectral types ∼A0 to F5. The interpretation of these objects as PMS candidates is further supported by independent results from CCD uvby Hβ observations. If confirmed, these stars would bridge the existing gap in the sample of PMS stars, between the coolest Herbig AeBe stars (HAeBe), and the hottest T Tauri stars. These PMS candidates are located some 0.5 and 1 mag above the main sequence in the V-(B-V) diagram, around the location of spectral types AF. This feature, together with their locations in the (U-B)-(B-V) diagram and the interpretation that they are PMS members, suggest an additional reddening law with a slope α = E(U-B)/E(B-V) ≃ 0.55, probably caused by circumstellar material.

Abstract Copyright: ∼

Journal keyword(s): {em words:} open clusters and associations: individual (IC 4996) - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/AJ/116/1801): table2.dat>

Nomenclature: Table 2: Cl* IC 4996 DAM NNN (Nos 1-610).

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

Simbad objects: 141

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Number of rows : 141
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 IC 1590 OpC 00 52 49.2 +56 37 42           ~ 70 0
2 IC 1805 OpC 02 32 52.1 +61 28 36           ~ 542 1
3 IC 380 GiC 04 31 41.3099977320 -12 55 37.334616024   15   14.21   ~ 15 0
4 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
5 NAME CMa R1 As* 07 08 21.3 -11 04 50           ~ 89 1
6 NGC 6523 Cl* 18 03.2 -24 23           ~ 187 1
7 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
8 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
9 Cl* IC 4996 DAM 37 * 20 16 20.8663380456 +37 42 01.097008740 17.12 16.66 15.61     A5 4 0
10 Cl* IC 4996 DAM 34 * 20 16 21.3156402864 +37 37 17.883051780 16.77 16.31 15.47     A8 2 0
11 Cl* IC 4996 DAM 32 * 20 16 21.8835731736 +37 39 34.883356320 16.54 16.10 15.30     A5 7 0
12 IC 4996 18 * 20 16 22.4787043872 +37 39 58.959448416 14.10 13.05 11.70     ~ 1 0
13 Cl* IC 4996 DAM 319 * 20 16 22.52 +37 37 16.4   20.03 18.39     ~ 2 0
14 Cl* IC 4996 VBP 4 * 20 16 22.5263838672 +37 40 31.076613516 18.18 17.83 16.79     ~ 2 0
15 Cl* IC 4996 VBP 6 * 20 16 23.0082876648 +37 40 43.563667620 19.28 17.86 16.59     ~ 2 0
16 Cl* IC 4996 PUR 92 * 20 16 23.0638526856 +37 40 58.786367556 14.76 14.69 14.03     ~ 1 0
17 Cl* IC 4996 DAM 73 * 20 16 23.3197723800 +37 42 35.278386012 15.97 15.46 14.62     ~ 2 0
18 Cl* IC 4996 VBP 7 * 20 16 23.5000793616 +37 37 44.869365480 16.00 15.71 14.97     ~ 2 0
19 Cl* IC 4996 DAM 84 * 20 16 24.2228920608 +37 40 42.857739480 16.54 16.23 15.30     ~ 2 0
20 Cl* IC 4996 VBP 11 * 20 16 24.2942407632 +37 39 55.639965456 16.08 15.82 14.92     ~ 2 0
21 Cl* IC 4996 VBP 9 * 20 16 24.4235037048 +37 40 49.759994712   20.22 18.58     ~ 4 0
22 Cl* IC 4996 VBP 14 * 20 16 25.1102356344 +37 38 54.733384644 18.37 18.57 17.49     ~ 2 0
23 Cl* IC 4996 VBP 16 * 20 16 25.2163492944 +37 39 14.303517048 19.27 17.49 15.63     ~ 6 0
24 Cl* IC 4996 VBP 15 * 20 16 25.2265142832 +37 37 30.623732076 17.72 17.13 15.97     ~ 2 0
25 Cl* IC 4996 DAM 31 * 20 16 25.3147559208 +37 40 24.892500540 16.40 15.97 15.22     A5 4 0
26 Cl* IC 4996 VBP 17 * 20 16 25.37 +37 38 03.3 19.12 19.02 17.89     ~ 2 0
27 Cl* IC 4996 VBP 19 * 20 16 25.5152651160 +37 39 37.283998212 17.73 17.21 16.06     ~ 4 0
28 Cl* IC 4996 VBP 20 * 20 16 25.6705475256 +37 37 18.848175816 19.31 18.29 16.92     ~ 2 0
29 Cl* IC 4996 DAM 78 * 20 16 25.7464577928 +37 42 21.656839068 16.13 15.67 14.91     A4 2 0
30 Cl* IC 4996 VBP 21 * 20 16 26.0728207752 +37 39 25.556992920 19.82 19.38 17.96     ~ 2 0
31 Cl* IC 4996 VBP 22 * 20 16 26.13 +37 40 48.9 18.46 17.74 16.44     ~ 2 0
32 Cl* IC 4996 VBP 29 * 20 16 26.6780141640 +37 38 35.417779008 18.30 18.14 17.03     ~ 2 0
33 Cl* IC 4996 VBP 23 * 20 16 26.7394436589 +37 39 16.617743297 15.93 15.54 14.83     ~ 3 0
34 Cl* IC 4996 VBP 24 * 20 16 26.8622284968 +37 39 04.718097504 20.12 18.79 17.38     ~ 3 0
35 Cl* IC 4996 VBP 25 * 20 16 26.9773630776 +37 38 03.133641444 16.83 16.38 15.25     ~ 6 0
36 Cl* IC 4996 VBP 28 * 20 16 27.1457247000 +37 37 35.103631980 15.32 15.10 14.47     ~ 4 0
37 Cl* IC 4996 VBP 30 * 20 16 27.18 +37 39 31.1 20.51 19.35 17.97     ~ 2 0
38 Cl* IC 4996 VBP 31 * 20 16 27.3636189384 +37 40 22.283582088 18.75 18.30 17.19     ~ 2 0
39 Cl* IC 4996 VBP 32 * 20 16 27.5370409152 +37 39 46.035930780 18.97 18.41 17.29     ~ 2 0
40 Cl* IC 4996 ZW 80 * 20 16 28.16 +37 37 42.5 14.77 14.62 14.04     ~ 3 0
41 Cl* IC 4996 VBP 34 * 20 16 28.2052590456 +37 40 46.207445340 19.22 18.66 17.48     ~ 2 0
42 Cl* IC 4996 VBP 35 * 20 16 28.3152628056 +37 39 53.898427404 19.12 18.14 16.99     ~ 2 0
43 Cl* IC 4996 VBP 38 * 20 16 28.56 +37 39 28.0 18.94 18.42 17.33     ~ 2 0
44 Cl* IC 4996 VBP 39 * 20 16 28.65 +37 40 54.1 16.62 16.30 15.46     ~ 2 0
45 Cl* IC 4996 VBP 40 * 20 16 28.8263276952 +37 38 02.448334824 14.91 14.75 14.16     ~ 4 0
46 Cl* IC 4996 VBP 43 * 20 16 28.98 +37 41 22.3 19.71 19.29 18.11     ~ 2 0
47 IC 4996 23 Be* 20 16 29.0778948768 +37 38 52.146900996 12.13 11.36 11.03     B3e 10 0
48 Cl* IC 4996 VBP 42 * 20 16 29.2423184520 +37 39 33.650748144 17.42 16.91 15.79     ~ 2 0
49 Cl* IC 4996 DAM 26 * 20 16 29.3132812584 +37 37 27.172811208 15.91 15.55 14.86     ~ 4 0
50 Cl* IC 4996 DAM 28 * 20 16 29.34 +37 39 09.9 16.06 15.72 14.98     A7 2 0
51 Cl* IC 4996 VBP 46 * 20 16 29.6832961320 +37 38 03.631361748 17.03 16.45 15.66     ~ 5 0
52 Cl* IC 4996 ZW 81 * 20 16 29.6999636758 +37 37 25.838708851 14.30 14.19 13.60     ~ 3 0
53 BD+37 3859 * 20 16 29.8484251008 +37 38 35.274839280 9.68 9.94 9.69     B1IV 47 0
54 Cl* IC 4996 DAM 30 * 20 16 29.8503581400 +37 39 30.277562220 16.21 15.78 15.03     A4 4 0
55 Cl* IC 4996 VBP 50 * 20 16 29.95 +37 40 22.4 18.37 18.32 17.34     ~ 2 0
56 Cl* IC 4996 VBP 49 * 20 16 30.5719440978 +37 39 26.244606422 15.82 15.49 14.83     ~ 4 0
57 IC 4996 27 * 20 16 30.9067660872 +37 37 23.269175904 12.37 12.67 12.16     ~ 4 0
58 Cl* IC 4996 VBP 55 * 20 16 30.9880033112 +37 40 26.842280635 17.26 16.87 15.81     ~ 4 0
59 Cl* IC 4996 DAM 16 * 20 16 31.1628136320 +37 39 09.830503476 14.45 14.39 13.83     B7 3 0
60 Cl* IC 4996 DAM 64 * 20 16 31.1644737672 +37 42 04.449682440 16.32 15.36 14.16     ~ 1 0
61 IC 4996 30 * 20 16 31.2057765240 +37 40 02.304043248 10.35 9.82 9.44     B3 10 0
62 Cl* IC 4996 DAM 20 * 20 16 31.2574201344 +37 37 29.660976048 14.94 14.80 14.19     ~ 4 0
63 HD 193007 * 20 16 31.3886986440 +37 38 31.219483236 7.95 8.40 7.95     B0.5II 60 0
64 IC 4996 31 * 20 16 31.4202444911 +37 38 51.113478191 13.01 13.17 12.68     ~ 5 0
65 Cl* IC 4996 VBP 59 * 20 16 31.4565541776 +37 39 32.616546624 18.26 17.63 16.59     ~ 4 0
66 Cl* IC 4996 DAM 33 * 20 16 31.91 +37 39 09.1 16.59 16.19 15.31     A7 2 0
67 Cl* IC 4996 VBP 62 * 20 16 32.0010984154 +37 38 04.287814703 14.70 14.64 14.12     ~ 4 0
68 Cl* IC 4996 DAM 160 * 20 16 32.1197920560 +37 39 41.825986956 19.27 18.50 17.20     ~ 4 0
69 Cl* IC 4996 VBP 65 * 20 16 32.2680312816 +37 39 56.586939588   17.80 16.38     ~ 2 0
70 BD+37 3862 * 20 16 32.4567217421 +37 38 42.224670180 8.93 9.09 8.78 9.09   B0IVp 36 0
71 IC 4996 OpC 20 16 32.7 +37 38 46           ~ 187 0
72 IC 4996 37 * 20 16 32.8734485280 +37 40 20.991036792 14.13 14.04 13.49     ~ 6 0
73 Cl* IC 4996 VBP 69 * 20 16 33.0506475264 +37 37 58.874963052 14.21 14.19 13.66     ~ 5 0
74 IC 4996 36 * 20 16 33.1580536704 +37 39 38.808678024 13.80 13.86 13.34     ~ 6 0
75 IC 4996 38 * 20 16 33.4511602464 +37 38 38.100913764 11.81 12.17 11.63     ~ 6 0
76 Cl* IC 4996 ZW 51 * 20 16 33.5312759448 +37 39 21.091825548 14.30 14.25 13.66     ~ 6 0
77 IC 4996 39 * 20 16 33.9982313016 +37 38 33.295950420 11.30 11.70 11.30     ~ 7 0
78 Cl* IC 4996 VBP 74 * 20 16 34.1568236952 +37 39 10.596305520 18.05 17.96 16.89     ~ 4 0
79 IC 4996 40 * 20 16 34.2270220080 +37 38 07.233008820 13.34 13.34 12.82     ~ 3 0
80 IC 4996 33 * 20 16 34.4466527688 +37 39 54.971883972 13.53 13.65 13.16     B5 8 0
81 Cl* IC 4996 VBP 79 * 20 16 34.85 +37 37 58.3   19.03 18.19     ~ 2 0
82 Cl* IC 4996 PUR G * 20 16 34.8688847952 +37 37 42.207946572 16.18 14.13 12.24     ~ 2 0
83 Cl* IC 4996 DAM 29 * 20 16 34.9802019498 +37 40 57.941973727 16.02 15.70 15.02     ~ 3 0
84 Cl* IC 4996 VBP 80 * 20 16 35.1623774880 +37 39 45.584143776 20.38 19.39 17.94     ~ 2 0
85 IC 4996 41 * 20 16 35.2194658368 +37 40 10.595694252 13.75 12.81 11.53     ~ 2 0
86 IC 4996 42 * 20 16 35.5950340920 +37 38 32.847244332 13.39 13.48 13.06     ~ 5 0
87 Cl* IC 4996 VBP 84 * 20 16 35.7325218864 +37 37 40.583726904 16.85 16.50 15.53     ~ 4 0
88 Cl* IC 4996 DAM 70 * 20 16 35.8258888368 +37 38 52.560631428 15.28 15.00 14.42     ~ 4 0
89 Cl* IC 4996 VBP 86 * 20 16 35.9734086744 +37 38 20.767952616 17.50 17.15 16.23     ~ 2 0
90 Cl* IC 4996 VBP 87 * 20 16 36.53 +37 37 39.4 19.30 18.79 17.73     ~ 2 0
91 Cl* IC 4996 DAM 80 * 20 16 36.5569586592 +37 39 36.163648512 16.15 15.74 14.97     A9 6 0
92 Cl* IC 4996 VBP 90 * 20 16 36.6679784256 +37 40 12.066253356 19.28 18.67 17.47     ~ 2 0
93 Cl* IC 4996 VBP 89 * 20 16 36.6732128623 +37 39 12.406876931 13.70 13.73 13.25     ~ 3 0
94 HD 228699 bC* 20 16 36.7316802456 +37 41 12.794872416 9.40 9.86 9.46     B0.5III 25 0
95 Cl* IC 4996 VBP 91 * 20 16 36.7618205880 +37 40 39.801711108 19.39 19.02 17.98     ~ 2 0
96 Cl* IC 4996 VBP 93 * 20 16 37.1049636984 +37 38 55.158351000 18.34 18.40 17.15     ~ 2 0
97 Cl* IC 4996 VBP 94 * 20 16 37.2756352992 +37 37 53.109915276 15.21 14.98 14.43     ~ 4 0
98 Cl* IC 4996 VBP 95 * 20 16 37.2906579000 +37 39 48.010595796   20.20 18.64     ~ 2 0
99 Cl* IC 4996 VBP 97 * 20 16 37.4829599976 +37 38 16.283842656 15.55 15.24 14.34     ~ 2 0
100 Cl* IC 4996 VBP 99 * 20 16 37.7854428912 +37 40 21.041821848 18.25 17.55 16.37     ~ 2 0
101 Cl* IC 4996 VBP 100 * 20 16 37.9861403280 +37 40 41.984036400 18.58 18.20 17.16     ~ 2 0
102 Cl* IC 4996 VBP 102 * 20 16 38.0533979064 +37 39 20.878297704 19.11 18.44 17.15     ~ 3 0
103 Cl* IC 4996 VBP 101 * 20 16 38.0964002112 +37 37 41.701289628 16.90 16.59 15.89     ~ 2 0
104 Cl* IC 4996 DAM 108 * 20 16 38.1805218792 +37 40 32.399175324 17.51 17.10 16.13     ~ 2 0
105 Cl* IC 4996 VBP 105 * 20 16 38.8660048680 +37 37 56.290830780 14.42 14.34 14.55     ~ 6 0
106 Cl* IC 4996 VBP 106 * 20 16 38.8781255040 +37 40 49.252745460 19.13 18.85 17.58     ~ 2 0
107 Cl* IC 4996 VBP 108 * 20 16 39.06 +37 40 02.8 20.18 19.35 18.20     ~ 2 0
108 Cl* IC 4996 VBP 107 * 20 16 39.1071366384 +37 38 36.895798932 17.53 17.17 16.06     ~ 2 0
109 Cl* IC 4996 DAM 40 * 20 16 39.21 +37 39 21.7 17.22 16.77 15.90     F0 3 0
110 Cl* IC 4996 VBP 109 * 20 16 39.5901428160 +37 39 29.285740044 15.32 15.08 14.52     ~ 5 0
111 Cl* IC 4996 VBP 110 * 20 16 39.6507255432 +37 39 50.854212756 19.13 17.78 16.20     ~ 2 0
112 Cl* IC 4996 VBP 111 * 20 16 39.7461943512 +37 40 28.128316296 18.06 17.63 16.66     ~ 2 0
113 Cl* IC 4996 DAM 36 * 20 16 40.0936887480 +37 40 06.642604920 16.92 16.385 15.456     A9 3 0
114 IC 4996 46 EB* 20 16 40.3693007664 +37 41 21.763285260 13.09 13.32 12.93     ~ 7 0
115 Cl* IC 4996 VBP 114 * 20 16 40.4335505976 +37 40 54.437641140 18.39 16.32 14.52     ~ 2 0
116 Cl* IC 4996 VBP 117 * 20 16 40.5343911888 +37 38 09.630768300 15.33 15.00 14.33     ~ 5 0
117 Cl* IC 4996 VBP 116 * 20 16 40.55 +37 37 59.0 18.20 17.76 16.72     ~ 2 0
118 Cl* IC 4996 VBP 118 * 20 16 40.5792676224 +37 39 54.786455172 14.75 14.67 14.18     ~ 4 0
119 Cl* IC 4996 DAM 68 * 20 16 41.2379245800 +37 41 41.239298508 15.34 15.17 14.37     ~ 1 0
120 Cl* IC 4996 VBP 119 * 20 16 41.47 +37 39 58.8 16.69 16.35 15.38     F4 3 0
121 Cl* IC 4996 DAM 42 * 20 16 41.5034364528 +37 40 37.218249552 17.61 17.19 16.18     ~ 2 0
122 V* V2243 Cyg EB* 20 16 41.5714503864 +37 38 04.757804232 19.22 18.75 17.42     ~ 7 0
123 Cl* IC 4996 DAM 43 * 20 16 42.1883058504 +37 40 07.652329752 18.19 17.54 16.36     ~ 4 0
124 Cl* IC 4996 HOAG 19 * 20 16 42.2630450112 +37 39 36.596297412 15.37 15.11 14.55     ~ 4 0
125 Cl* IC 4996 VBP 125 * 20 16 42.56 +37 40 30.6 18.07 17.59 16.66     ~ 2 0
126 IC 4996 49 * 20 16 42.6240046488 +37 39 12.601855296 12.52 12.80 12.40     B3 9 0
127 Cl* IC 4996 VBP 126 * 20 16 42.7871823336 +37 40 07.150524600 18.79 18.22 17.07     ~ 2 0
128 Cl* IC 4996 ZW 46 * 20 16 43.9675391484 +37 39 33.993407605 16.38 16.02 15.30     ~ 5 0
129 Cl* IC 4996 DAM 38 * 20 16 44.84 +37 42 01.0 17.02 16.64 15.69     ~ 1 0
130 V* V1922 Cyg bC* 20 16 45.0728476776 +37 40 43.172316480 10.83 11.07 10.84     B5 12 0
131 EM* VES 191 Em* 20 16 46.4755457808 +37 41 35.138501700 13.15 13.02 12.36     ~ 3 0
132 IC 4996 53 * 20 16 47.1718203480 +37 38 23.724827088 13.55 13.69 13.31     ~ 4 0
133 Cl* IC 4996 DAM 96 * 20 16 48.0079609176 +37 41 40.197035400 16.94 16.60 15.71     ~ 3 0
134 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 270 1
135 Cl Berkeley 86 OpC 20 20 20.6 +38 42 15           ~ 130 0
136 Cl Berkeley 87 OpC 20 21 35.0 +37 25 14           ~ 141 0
137 NGC 6910 OpC 20 23 12.2 +40 46 16           ~ 202 0
138 M 29 OpC 20 23 42.9 +38 29 25   7.30 6.6     ~ 256 0
139 NGC 7067 OpC 21 24 14.0 +48 00 55   10.64 9.7     ~ 63 0
140 NGC 7128 OpC 21 43 58.0 +53 43 00   10.54 9.7     ~ 82 0
141 NGC 7380 OpC 22 47 23.4 +58 06 55           ~ 198 0

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