1998PASP..110.1318G

Query : 1998PASP..110.1318G

1998PASP..110.1318G - Publ. Astron. Soc. Pac., 110, 1318-1335 (1998/November-0)

The open cluster NGC 7789. II. CCD VI photometry.

GIM M., VANDENBERG D.A., STETSON P.B., HESSER J.E. and ZUREK D.R.

Abstract (from CDS):

A V, V-I-diagram for the intermediate-age open cluster NGC 7789 has been derived from CCD observations of more than 15,000 stars within ~18' of the cluster center. From the brightest giants and blue stragglers at V∼11 to the faintest lower main-sequence stars that were observed (at V∼21, MV∼9), the color-magnitude diagram is well defined. A prominent clump of core helium-burning stars is evident at V=13.0, and the upper end of the main sequence shows a fairly pronounced curvature to the red, which is indicative of significant convective core overshooting. Indeed, comparisons with up-to-date stellar models show that it is not possible to explain the observed morphology in the vicinity of the turnoff unless the overshooting is quite extensive. Interestingly, if sufficient overshooting is assumed in order to match the main-sequence data, it is not possible to reproduce the cluster's extended giant branch unless the cluster age is at least 1.6 Gyr (assuming a metallicity in the range -0.2≤[FeMH]≤0.0). This, in turn, requires that the cluster have an apparent distance modulus m-MV≤12.2. Thus, sometime within the past few hundred million years, the ignition of helium burning in NGC 7789 has switched from a quiescent to an explosive (``flash'') phenomenon, and the length of the cluster's red giant branch has been steadily increasing with the passage of time since then. From main-sequence fits to models that have been carefully normalized to the Sun, we infer a reddening 0.35≤EV-I≤0.38.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 7789 - Stars: Evolution

VizieR on-line data: <Available at CDS (J/PASP/110/1318): table.dat>

Nomenclature: Table 5, col(3): Cl* NGC 7789 G NNNN N=44. table.dat: [GVS98] NNNNN (Nos 1-15617).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 108

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Number of rows : 108
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 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
2 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 562 0
3 Cl* NGC 7789 M 99 * 23 55 08.8143085008 +56 47 27.044450340   12.61 12.16     ~ 9 0
4 Cl* NGC 7789 M 144 Pu* 23 55 24.7228659947 +57 01 47.713683078   13.98 13.56     ~ 4 0
5 Cl* NGC 7789 M 172 ** 23 55 35.61696 +56 30 16.7832   12.573 12.053 11.935   ~ 8 0
6 Cl* NGC 7789 M 210 * 23 55 48.4019164176 +56 58 39.601982532   13.28 12.91     ~ 4 0
7 Cl* NGC 7789 M 238 * 23 55 57.0068692992 +56 40 54.907373892   12.53 13.28     ~ 9 0
8 NGC 7789 2 * 23 56 03.1660173312 +56 35 12.970201128   13.84 13.34     ~ 9 0
9 HD 224234 * 23 56 12.7033669728 +56 43 55.714158768   10.21 8.45     M2 7 0
10 NGC 7789 68 * 23 56 17.7903034008 +56 33 24.423642576   13.93 13.66     ~ 5 0
11 NGC 7789 72 RG* 23 56 17.8342066080 +56 40 07.714509600   12.79 11.0536   9.089 ~ 20 0
12 NGC 7789 88 SB* 23 56 20.1939677904 +56 48 04.661709444   13.48 13.0376   12.517 ~ 13 0
13 NGC 7789 144 * 23 56 30.6965549784 +56 44 23.887345380           B8 8 0
14 NGC 7789 160 SB* 23 56 33.0337096968 +56 44 33.182001744   14.29 13.0343   11.686 ~ 12 0
15 NGC 7789 168 * 23 56 34.5699377376 +56 44 22.454756052   14.16 13.7693   13.292 B9 8 0
16 NGC 7789 169 * 23 56 34.7270484600 +56 42 13.172707512   14.86 14.1794   13.254 ~ 9 0
17 NGC 7789 192 * 23 56 38.0646747840 +56 42 38.108266308   13.96 13.5680   13.083 ~ 6 0
18 NGC 7789 193 RG* 23 56 38.0698216200 +56 49 40.462407624   14.03 12.6063   11.092 ~ 13 0
19 NGC 7789 197 * 23 56 39.2370215328 +56 41 56.524710948   13.75 13.2948   12.707 A3 12 0
20 NGC 7789 213 * 23 56 41.0746748304 +56 46 36.423648696   15.11 13.6577   12.014 ~ 3 0
21 NGC 7789 234 * 23 56 43.3669884504 +56 50 57.675867252   13.94 13.4730   12.900 A3 7 0
22 NGC 7789 244 * 23 56 44.5168872720 +56 42 53.552723796   14.39 13.1599   11.811 ~ 13 0
23 NGC 7789 246 * 23 56 44.7296165256 +56 44 05.862578676   10.48 10.2678   10.000 ~ 11 0
24 NGC 7789 256 * 23 56 45.7220463936 +56 48 09.216367488   14.63 13.9910   13.101 ~ 3 0
25 NGC 7789 253 * 23 56 45.7339285392 +56 42 01.945204488   14.47 13.7420   12.793 ~ 9 0
26 NGC 7789 282 BS* 23 56 49.0212781200 +56 38 18.760515648   12.27 12.0100   11.601 ~ 20 0
27 Cl* NGC 7789 M 459 SB* 23 56 50.2973903904 +56 59 02.074481448   11.64 11.48     ~ 8 0
28 NGC 7789 296 * 23 56 50.7118748784 +56 40 47.940474936   13.09 12.7674   12.025 ~ 4 0
29 NGC 7789 301 RG* 23 56 52.2278331240 +56 33 38.840428440   13.61 12.2728   10.734 ~ 26 0
30 NGC 7789 304 * 23 56 52.5172127304 +56 43 29.756819784   12.76 11.0646   9.169 ~ 17 0
31 NGC 7789 311 SB* 23 56 53.5341913224 +56 42 15.432650244   15.43 14.8168   14.005 ~ 8 0
32 NGC 7789 316 BS* 23 56 54.2384834544 +56 40 46.790111712   14.15 13.7518   13.270 ~ 18 0
33 NGC 7789 321 RG* 23 56 54.7365207024 +56 48 16.263428616   14.13 12.9420   11.607 ~ 19 0
34 NGC 7789 325 * 23 56 55.1547213120 +56 41 57.015617892     14.6682   13.871 ~ 7 0
35 NGC 7789 329 RG* 23 56 55.4629828752 +56 45 08.976525300   13.68 12.3050   10.765 K2III 37 0
36 NGC 7789 338 SB* 23 56 56.4702653424 +56 44 38.273919504   12.93 11.8015   10.515 G8III 27 0
37 NGC 7789 342 BS* 23 56 56.7409401672 +56 41 11.200911828   12.59 12.3745   12.025 B9 30 0
38 NGC 7789 349 * 23 56 57.1530879456 +56 49 51.560401224   13.83 13.3698   12.783 A3 5 0
39 NGC 7789 347 * 23 56 57.1610482032 +56 41 49.555836924   12.982 12.9817   11.638 ~ 11 0
40 NGC 7789 351 * 23 56 57.4799974776 +56 35 20.969576412   14.03 13.53   12.873 ~ 4 0
41 Cl* NGC 7789 M 511 * 23 56 58.4801409936 +56 55 09.115268376   11.05 10.80     ~ 14 0
42 NGC 7789 371 BS* 23 56 59.0233671600 +56 47 33.118292724   13.27 12.9070   12.419 A3V 24 0
43 NGC 7789 409 * 23 57 02.5906117152 +56 47 02.160563064   13.29 12.9210   12.520 A1 15 0
44 NGC 7789 415 SB* 23 57 03.2501165215 +56 45 57.912486452   12.55 10.6648   8.481 M1.0III 44 0
45 NGC 7789 416 * 23 57 03.5671178064 +56 43 20.900650656   14.35 13.1109   11.783 ~ 16 0
46 NGC 7789 430 * 23 57 04.5451404720 +56 48 40.468850640   13.58 12.9461   12.160 ~ 3 0
47 NGC 7789 444 * 23 57 05.8245915096 +56 44 48.292397736   14.13 12.9226   11.583 ~ 13 0
48 NGC 7789 453 * 23 57 06.4107002616 +56 46 50.133397080   12.85 12.6123   12.232 B9 17 0
49 NGC 7789 462 SB* 23 57 07.3778708160 +56 50 29.266235088   13.47 12.95     ~ 5 0
50 NGC 7789 461 RG* 23 57 07.4408657311 +56 41 41.634837558   12.994 11.375 10.813 9.56 ~ 33 0
51 NGC 7789 466 * 23 57 07.7678740032 +56 40 50.178705384   13.63 12.1934   10.654 ~ 5 0
52 NGC 7789 468 * 23 57 08.0503461336 +56 43 21.602897040   12.75 11.6115   9.722 K4III 46 0
53 NGC 7789 476 RG* 23 57 08.9526221314 +56 48 50.332490009   14.38 13.1774   11.831 ~ 32 0
54 NGC 7789 489 SB* 23 57 10.0569020256 +56 40 56.571370896   12.82 11.3165   9.658 K2II 21 0
55 NGC 7789 494 RG* 23 57 10.4044757640 +56 42 49.333771908   12.42 10.7373   8.592 K4III 22 0
56 NGC 7789 501 RG* 23 57 11.1348067512 +56 44 29.273305596   12.97 11.26 10.66 9.365 K5III 46 0
57 NGC 7789 521 SB* 23 57 12.0426323904 +56 51 10.975056444   14.17 13.5262   12.615 ~ 10 0
58 NGC 7789 526 * 23 57 12.4104031176 +56 50 00.735142704   14.08 12.8517   11.516 ~ 21 0
59 NGC 7789 549 RG* 23 57 14.0025494832 +56 40 58.646633376   13.7 12.2895   10.776 K2III 35 0
60 NGC 7789 555 * 23 57 14.4383868528 +56 39 25.381787256   14.29 13.0712   11.737 ~ 13 0
61 NGC 7789 558 * 23 57 14.6682469296 +56 49 05.318193216   15.21 14.6131   13.788 ~ 8 0
62 NGC 7789 575 RG* 23 57 16.9215760032 +56 46 19.916182380   13.51 12.1003   10.591 K2III 34 0
63 NGC 7789 605 * 23 57 19.2105258408 +56 40 51.426837948   14.05 12.8171   11.482 K0III 30 0
64 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0
65 NGC 7789 635 * 23 57 22.291 +56 53 03.99   13.45 12.9356   12.247 ~ 3 0
66 NGC 7789 669 RG* 23 57 24.4766316792 +56 48 30.495586788   13.04 11.4563   9.74 K4III 41 0
67 NGC 7789 671 * 23 57 24.6229512696 +56 49 52.033277532   13.98 13.3573   12.553 ~ 4 0
68 NGC 7789 676 HB* 23 57 25.0030206310 +56 38 36.273112092   14.07 12.8386   11.555 G8III 26 0
69 NGC 7789 677 * 23 57 25.1842322040 +56 38 00.644665596   11.24 11.0805   10.785 ~ 17 0
70 NGC 7789 684 * 23 57 25.5243338256 +56 45 56.562859908   14.22 12.9803   11.627 ~ 13 0
71 NGC 7789 696 BS* 23 57 26.7400490376 +56 48 25.974763416   14.06 13.7174   13.342 ~ 14 0
72 NGC 7789 724 RG* 23 57 28.7152495824 +56 35 22.689066156   14.40 13.1709   11.866 ~ 14 0
73 NGC 7789 732 * 23 57 29.5508446872 +56 42 23.505669468   13.92 12.6944   11.369 ~ 28 0
74 NGC 7789 737 * 23 57 29.9776606244 +56 43 19.905297761   14.53 13.3530   12.078 ~ 23 0
75 NGC 7789 746 BS* 23 57 30.3612161664 +56 44 30.351673788   13.13 12.8105   12.344 ~ 25 0
76 NGC 7789 751 AB? 23 57 30.7854423160 +56 50 51.418660322   12.66 10.8783   8.768 M1.0III 26 0
77 NGC 7789 758 * 23 57 31.2529521648 +56 35 16.584761796   11.16 10.4531   9.681 G8V 15 0
78 Cl* NGC 7789 M 808 * 23 57 33.7636091688 +56 56 20.282881092   12.80 13.080     ~ 7 0
79 NGC 7789 799 Pe* 23 57 34.3027144248 +56 46 02.878476348   12.09 11.7254   11.279 A5mA0 13 0
80 NGC 7789 833 * 23 57 38.4441361560 +56 50 30.988163688   16.04 15.3074   14.375 ~ 2 0
81 NGC 7789 859 SB* 23 57 40.5612085128 +56 45 23.107928796   14.02 12.6385   11.132 K2III 37 0
82 NGC 7789 866 * 23 57 41.3446546944 +56 42 07.435192644   14.08 12.8696   11.548 G9III 16 0
83 NGC 7789 875 HB* 23 57 42.7845722928 +56 38 56.654776104   14.17 12.9500   11.642 G9III 26 0
84 NGC 7789 889 * 23 57 43.9362208824 +56 39 42.811186608   11.71 11.5052   11.233 ~ 7 0
85 NGC 7789 897 HB* 23 57 44.8114795104 +56 45 44.031973356   14.16 12.9220   11.576 G9III 31 0
86 NGC 7789 906 * 23 57 46.1444265720 +56 36 49.524685200   12.91 12.33     ~ 3 0
87 NGC 7789 908 SB* 23 57 46.5026064216 +56 44 25.613050992   14.22 13.0201   11.715 ~ 16 0
88 NGC 7789 934 SB* 23 57 48.50 +56 41 57.8   13.32 13.05     ~ 5 0
89 NGC 7789 971 RG* 23 57 51.5681710632 +56 38 56.654717784   12.94 11.0453   8.648 M3III 38 0
90 NGC 7789 977 SB* 23 57 52.0469168496 +56 42 25.571135160   12.973 11.147 10.481 9.126 K3III 14 0
91 NGC 7789 1036 SB* 23 57 57.3779903400 +56 43 11.563407264   14.18 12.9877   11.692 ~ 10 0
92 NGC 7789 1047 * 23 57 58.4047201704 +56 44 16.679109156   12.97 12.4003   11.733 ~ 8 0
93 NGC 7789 1071 RG* 23 58 01.3301334528 +56 39 22.003788816   13.89 12.5566   11.168 ~ 22 0
94 NGC 7789 1095 BS* 23 58 05.2636243920 +56 47 02.870218320           ~ 12 0
95 NGC 7789 1097 * 23 58 05.3502522888 +56 46 56.072418996   15.12 14.3810   13.495 ~ 11 0
96 NGC 7789 1107 * 23 58 07.0211607960 +56 40 48.151819128   14.02 12.7945   11.458 ~ 20 0
97 NGC 7789 1114 * 23 58 09.1380950160 +56 39 52.387011756   14.46 13.2414   11.939 ~ 11 0
98 NGC 7789 1119 SB* 23 58 10.1297339448 +56 39 00.368811036   13.08 12.7120   12.275 ~ 5 0
99 Cl* NGC 7789 M 1060 * 23 58 16.7636076600 +56 28 15.824846280   11.04 10.57     ~ 13 0
100 NGC 7789 1168 BS* 23 58 17.8053306192 +56 49 39.894482100   14.35 13.8584   13.291 A3V 17 0
101 NGC 7789 1208 * 23 58 25.1729172456 +56 38 34.640526912   12.41 11.60     ~ 3 0
102 NGC 7789 1211 Pe* 23 58 25.5568305648 +56 42 24.766198776   11.5 11.4814   11.160 B7VSi 24 0
103 NGC 7789 1270 SB* 23 58 37.8308645875 +56 45 45.033728848   13.92 13.46     ~ 11 0
104 NGC 7789 1288 * 23 58 41.25 +56 52 07.7   13.27 13.00     ~ 5 0
105 NGC 7789 1309 * 23 58 45.2681937024 +56 38 19.227186384   11.75 11.27     ~ 3 0
106 NGC 7789 632 * ~ ~   14.68 13.97     ~ 2 0
107 NGC 7789 792 * ~ ~   15.78 15.17     ~ 2 0
108 Cl* NGC 7789 M 1251 * ~ ~   13.40 12.80     ~ 4 0

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