2020A&A...644A.136A

Query : 2020A&A...644A.136A

2020A&A...644A.136A - Astronomy and Astrophysics, volume 644A136-136 (2020/12-1)

Three open clusters containing Cepheids: NGC 6649, NGC 6664, and Berkeley 55.

ALONSO-SANTIAGO J., NEGUERUELA I., MARCO A., TABERNERO H.M. and CASTRO N.

Abstract (from CDS):

Classical Cepheids in open clusters play an important role in benchmarking stellar evolution models, in addition to anchoring the cosmic distance scale and invariably securing the Hubble constant. Three pertinent clusters hosting classical Cepheids and red (super)giants are: NGC 6649, NGC 6664, and Berkeley 55. These clusters form the basis of analysis to assess newly acquired spectra (≃50), archival photometry, and Gaia DR2 data. Importantly, for the first time chemical abundances were determined for the evolved members of NGC 6649 and NGC 6664. We find that they are slightly metal-poor relative to the mean Galactic gradient. Also, an overabundance of Ba is observed. These two clusters likely belong to the thin disc and the latter finding supports the "s-enhanced" scenario of D'Orazi et al. (2009ApJ...693L..31D). NGC 6664 and Berkeley 55 exhibit radial velocities consistent with Galactic rotation, while NGC 6649 displays a peculiar velocity. The resulting age estimates for the clusters (≃70Ma) imply masses of ≃6M☉ for the (super)giant demographic. Lastly, the observed yellow-to-red (super)giant ratio is lower than expected and the overall differences that are relative to the models reflect the outstanding theoretical uncertainties.

Abstract Copyright: © ESO 2020

Journal keyword(s): open clusters and associations: individual: NGC 6649 - open clusters and associations: individual: NGC 6664 - open clusters and associations: individual: Berkeley 55 - Hertzsprung-Russell and C-M diagrams - stars: abundances - stars: variables: Cepheids

CDS comments: Table 1 Star 52 in NGC 6649, star 228 in NGC 6664 and star A in NGC 6664 are not identified.

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 129 OpC 00 30 25.8 +60 12 44   7.33 6.5     ~ 216 0
2 NGC 225 OpC 00 42 34.7 +61 47 30   7.43 7.0     ~ 110 0
3 NGC 436 OpC 01 16 00.1 +58 49 15   8.01 8.8     ~ 80 0
4 Cl Trumpler 2 OpC 02 36 14.9 +55 54 32           ~ 124 0
5 Cl Trumpler 3 OpC 03 12 00.3 +63 12 35     7.0     ~ 57 0
6 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
7 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
8 NGC 1647 OpC 04 46 00.4 +19 05 06   6.82 6.4     ~ 189 0
9 NGC 1778 OpC 05 08 07.9 +37 01 01   8.20 7.7     ~ 99 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
11 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
12 NGC 2186 OpC 06 12 06.8 +05 27 07   9.20 8.7     ~ 62 0
13 NGC 2232 OpC 06 27 45.6 -04 44 26           ~ 212 0
14 NGC 2323 OpC 07 02 47.3 -08 22 07           ~ 212 0
15 NGC 2345 OpC 07 08 21.4 -13 11 44   8.58 7.7     ~ 92 0
16 NGC 2354 OpC 07 13 59.2 -25 43 40   7.28 6.5     ~ 111 0
17 ESO 428-24 OpC 07 22 56.3 -29 29 59           ~ 41 0
18 NGC 2422 OpC 07 36 35.8 -14 30 15           ~ 275 0
19 Cl Trumpler 9 OpC 07 55 39.8 -25 53 20   8.96 8.7     ~ 53 0
20 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
21 NGC 2546 OpC 08 12 39.8 -37 39 34   6.46 6.3     ~ 125 0
22 NGC 2669 OpC 08 46 29.5 -52 55 05   6.35 6.1     ~ 81 0
23 IC 2488 OpC 09 27 28.6 -57 00 45           ~ 75 0
24 NGC 2972 OpC 09 40 14.1 -50 19 36   10.72 9.9     ~ 65 0
25 NGC 3033 OpC 09 48 33.0 -56 24 35   9.24 8.8     ~ 59 0
26 NGC 3105 OpC 10 00 41.0 -54 47 20   10.73 9.7     ~ 47 0
27 NGC 3114 OpC 10 01 55.0 -60 02 16   4.47 4.2     ~ 213 0
28 NGC 3228 OpC 10 21 34.1 -51 45 39           ~ 98 0
29 NGC 3247 OpC 10 25 52 -57 55.6   7.99 7.6     ~ 39 0
30 Cl Melotte 101 OpC 10 42 08.3 -65 06 35           ~ 57 0
31 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
32 Cl Collinder 258 OpC 12 27 10.8 -60 46 13   7.39 7.1     ~ 76 1
33 NGC 4609 OpC 12 42 19.2 -62 59 36   7.32 6.9     ~ 96 0
34 NGC 5138 OpC 13 27 19.3 -59 01 23           ~ 65 0
35 NGC 5168 OpC 13 31 08.7 -60 56 45   9.55 9.1     ~ 60 0
36 NGC 5617 OpC 14 29 46.5 -60 43 02           ~ 108 0
37 NGC 5662 OpC 14 34 55.5 -56 40 41   6.18 5.5     ~ 136 0
38 NGC 5749 OpC 14 48 46.6 -54 30 43     8.8     ~ 69 0
39 V* QZ Nor cC* 16 11 20.4664528848 -54 21 14.824796688 10.08 9.53 8.71 8.66   G1Iab 154 0
40 HD 145304 BS* 16 12 58.5749457840 -54 03 59.812807680 8.36 8.952 8.887 9.47   B2III 29 0
41 NGC 6067 OpC 16 13 10.2 -54 13 48           ~ 239 0
42 NGC 6087 OpC 16 18 55.7 -57 53 32           ~ 198 0
43 NGC 6124 OpC 16 25 18.6 -40 39 45   6.70 5.8     ~ 91 0
44 NGC 6192 OpC 16 40 18.7 -43 21 16           ~ 99 0
45 NGC 6405 OpC 17 40 14.5 -32 14 16           ~ 235 0
46 NGC 6416 OpC 17 44 06.6 -32 21 21           ~ 70 0
47 NGC 6520 OpC 18 03 25.4 -27 53 09     7.6     ~ 72 0
48 NGC 6546 OpC 18 07 22 -23 17.8   8.65 8.0     ~ 44 0
49 IC 4725 OpC 18 31 47.5 -19 07 37           ~ 239 0
50 2MASS J18332105-1022486 s*r 18 33 21.0607171920 -10 22 48.682364124   15.15 12.57     K1Ib 12 0
51 NGC 6649 48 * 18 33 21.7425687696 -10 23 02.163678864   14.77 13.44     B5V 15 0
52 NGC 6649 23 * 18 33 23.5156510548 -10 24 13.295019320   14.25 12.98     B7III 16 0
53 BD-10 4718 SB* 18 33 24.4327437168 -10 26 26.457137232   11.450 9.596 9.593   K0Ib-II 6 0
54 BD-10 4718B * 18 33 24.7208455977 -10 26 26.393752540           B8IV 3 0
55 NGC 6649 19 * 18 33 24.8894522874 -10 24 24.786987247   13.75 12.09     F5Ib-II 12 0
56 NGC 6649 OpC 18 33 26.2 -10 23 54   10.35 8.9     ~ 154 0
57 2MASS J18332658-1025317 s*r 18 33 26.5932448668 -10 25 31.797650608   14.53 12.03     K5Ib 13 0
58 NGC 6649 14 * 18 33 28.1293387488 -10 23 23.819361216   14.79 13.45     B5V 10 0
59 NGC 6649 9 Be* 18 33 28.3004329272 -10 24 08.756967024   12.98 11.76 10.6   B0Ve 26 0
60 NGC 6649 28 * 18 33 29.7617476800 -10 22 43.558088052   13.67 12.38     B4III 12 0
61 NGC 6649 33 * 18 33 31.7923678488 -10 23 45.524313780   13.89 12.73     B6IV 10 0
62 NGC 6649 35 * 18 33 32.0773972632 -10 24 14.921358876   14.17 13.06     B5V 13 0
63 V* V367 Sct cC* 18 33 35.2353033192 -10 25 38.126250552   13.34 11.580     F7Ib 187 0
64 NGC 6649 58 * 18 33 35.9088131760 -10 22 40.503605304   13.52 12.20     B8II 13 0
65 2MASS J18335423-1019100 * 18 33 54.2453253096 -10 19 10.057506888           ~ 5 0
66 BD-08 4641 * 18 35 38.8238625000 -08 17 12.923103696   11.10 10.12     ~ 5 0
67 TYC 5691-1067-1 * 18 36 05.2382980176 -07 54 58.675396176   12.24 11.46     B7 6 0
68 BD-08 4646 * 18 36 22.2567501768 -08 10 56.731904040 11.24 11.45 10.92     BN2IV 18 0
69 BD-08 4647 s*y 18 36 25.6805764632 -08 08 34.578054168   12.32 10.33     G8Ib 17 0
70 BD-08 4649 s*r 18 36 31.1614998024 -08 10 20.195004036 15.060 12.59 10.89     K0Ib 15 0
71 NGC 6664 61 * 18 36 31.3362677544 -08 12 52.471513080   12.46 11.94     B3IV 12 0
72 NGC 6664 OpC 18 36 32.4 -08 11 23   8.81 7.8     ~ 135 0
73 BD-08 4650 s*r 18 36 32.9557818384 -08 15 31.235000472   12.94 10.81     K4Ib 6 0
74 NGC 6664 64 * 18 36 33.5514446994 -08 10 44.867916366   13.37 12.73 12.77 11.77 B6V 9 0
75 NGC 6664 63 * 18 36 37.1865969216 -08 10 43.594075632   13 12.42     B5III 7 0
76 V* EV Sct cC* 18 36 39.6017483712 -08 11 05.361288684   10.99 9.90     F8Ib 267 0
77 BD-08 4653 s*r 18 36 40.8309469392 -08 19 05.643533460   12.91 10.75     K2Ib 4 0
78 BD-08 4654 * 18 36 45.7041917568 -08 10 32.955167388   11.17 10.70     B9IV 9 0
79 NGC 6664 59 * 18 36 47.0061086352 -08 17 29.859761400   11.91 12.17     B2.5V 7 0
80 LS IV -08 14 * 18 36 47.1012727296 -08 16 57.130724280 12.579 12.49 12.07     B6IV 23 0
81 BD-08 4655 * 18 36 47.5120227648 -08 13 11.129679120   11.42 11.17 11.06   B6IIIe 12 0
82 V* RU Sct cC* 18 41 56.3818572048 -04 06 38.376404820   10.17 8.82     G5 216 0
83 Cl Trumpler 35 OpC 18 42 57.9 -04 13 21   10.44 9.2     ~ 79 0
84 M 26 OpC 18 45 16.8 -09 23 14   8.0 8.87     ~ 112 0
85 NGC 6709 OpC 18 51 17.1 +10 20 15   7.18 6.7     ~ 145 0
86 NGC 6755 OpC 19 07 44.5 +04 13 46   8.60 7.5     ~ 91 0
87 Cl Berkeley 51 OpC 20 11 53.3 +34 24 07           ~ 28 0
88 NGC 7031 OpC 21 07 12.9 +50 52 07   10.01 9.1     ~ 65 1
89 Cl Berkeley 55 OpC 21 16 56.6 +51 45 41           ~ 41 0
90 [NM2012] 61 * 21 17 06.6942181344 +51 48 13.632992748 21.961 20.722 19.015     M2II 2 0
91 [NM2012] 17 * 21 17 15.7268960088 +51 45 56.297511216 20.634 19.205 17.634     B5V 2 0
92 [NM2012] 12 * 21 17 16.6262537304 +51 46 21.324554940 20.930 19.562 18.009     B6IV 2 0
93 [NM2012] 11 * 21 17 17.0093574216 +51 48 29.165959512 22.444 21.380 19.581     B6IV 2 0
94 [NM2012] 10 * 21 17 17.0180529528 +51 44 46.665009744 22.126 21.108 19.297     B6IV 2 0
95 [NM2012] 7 * 21 17 17.7680265456 +51 45 48.534445296 22.708 21.681 19.769     B4IV 2 0
96 [NM2012] 6 * 21 17 17.9205737664 +51 47 59.528241420 20.414 19.568 17.898     K4II 2 0
97 [NM2012] 4 * 21 17 18.0059632896 +51 44 31.877191932 22.637 21.600 19.612     K0Ib-II 2 0
98 [NM2012] 5 * 21 17 18.0306562992 +51 45 59.525138016 21.982 21.006 19.274     F8Ib 2 0
99 [NM2012] 3 * 21 17 18.0882885552 +51 45 50.149384020 22.529 21.168 19.400     G8II 2 0
100 2MASS J21171845+5148500 s*r 21 17 18.4347609488 +51 48 49.949998633 21.046 19.613 18.086     K0Ib 2 0
101 2MASS J21171848+5147260 s*r 21 17 18.4791013944 +51 47 26.104109748 20.601 19.759 18.218     K1Ib 5 0
102 NGC 7063 OpC 21 24 30.2 +36 29 45   7.32 7.0     ~ 99 0
103 * del Cep cC* 22 29 10.2626640314 +58 24 54.697613650 4.71 4.35 3.75   3.219 F5Iab:+B7-8 763 0
104 Ass Cep OB 6 As* 22 30 +58.0           ~ 46 0
105 M 52 OpC 23 24 47.2 +61 35 32           ~ 200 0
106 NGC 7790 OpC 23 58 27.6 +61 12 33   9.18 8.5     ~ 286 0
107 NGC 6664 60 * ~ ~   12.54 11.89     B6IV 1 0
108 NGC 6649 111 s*r ~ ~   15.55 13.30     M5Ib 1 0

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