2011ApJ...729L..10B

Query : 2011ApJ...729L..10B

2011ApJ...729L..10B - Astrophys. J., 729, L10 (2011/March-1)

Sounding open clusters: asteroseismic constraints from Kepler on the properties of NGC 6791 and NGC 6819.

BASU S., GRUNDAHL F., STELLO D., KALLINGER T., HEKKER S., MOSSER B., GARCIA R.A., MATHUR S., BROGAARD K., BRUNTT H., CHAPLIN W.J., GAI N., ELSWORTH Y., ESCH L., BALLOT J., BEDDING T.R., GRUBERBAUER M., HUBER D., MIGLIO A., YILDIZ M., KJELDSEN H., CHRISTENSEN-DALSGAARD J., GILLILAND R.L., FANELLI M.M., IBRAHIM K.A. and SMITH J.C.

Abstract (from CDS):

We present initial results on some of the properties of open clusters NGC 6791 and NGC 6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating the mass, radius, and log g of stars on the red giant branch (RGB) of these clusters, we estimate the distance to the clusters and their ages. Our model-independent estimate of the distance modulus of NGC 6791 is (m - M)0= 13.11±0.06. We find (m - M)0= 11.85 ±0.05 for NGC 6819. The average mass of stars on the RGB of NGC 6791 is 1.20±0.01 M☉, while that of NGC 6819 is 1.68±0.03 M☉. It should be noted that we do not have data that cover the entire RGB and the actual mass will be somewhat lower. We have determined model-dependent estimates of ages of these clusters. We find ages between 6.8 and 8.6 Gyr for NGC 6791, however, most sets of models give ages around 7 Gyr. We obtain ages between 2 and 2.4 Gyr for NGC 6819.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (NGC 6819, NGC 6791) - stars: fundamental parameters - stars: interiors - stars: oscillations

VizieR on-line data: <Available at CDS (J/ApJ/729/L10): table1.dat>

Simbad objects: 59

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Number of rows : 59
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 Cl* NGC 6791 SBG 611 RG* 19 20 19.7341289685 +37 46 54.990126268   16.425 14.977   13.534 K4III 41 0
2 Cl* NGC 6791 SBG 1110 RG* 19 20 24.4694858256 +37 46 13.978788096   16.547 15.106   13.665 ~ 21 0
3 Cl* NGC 6791 SBG 1705 RG* 19 20 28.7001059832 +37 43 16.976756640   16.558 15.213   13.882 ~ 37 0
4 NGC 6791 3029 RG* 19 20 32.6674155384 +37 46 22.244828808   16.226 14.788   13.283 ~ 27 0
5 Cl* NGC 6791 SBG 2915 RG* 19 20 35.8560387576 +37 46 52.103490348   16.447 15.020   13.551 ~ 20 0
6 Cl* NGC 6791 SBG 3354 RG* 19 20 37.8383397024 +37 45 25.044621696   16.660 15.298   13.912 ~ 30 0
7 NGC 6791 3017 RG* 19 20 39.3453763272 +37 48 04.868503452   16.084 14.612   13.079 M0e 50 0
8 Cl* NGC 6791 SBG 4202 RG* 19 20 41.0266039488 +37 43 02.595209988   16.826 15.503   14.192 ~ 34 0
9 Cl* NGC 6791 GVZH R21 RG* 19 20 43.5655054944 +37 47 01.933389528   16.160 14.713   13.230 ~ 29 0
10 Cl* NGC 6791 SBG 4968 RG* 19 20 43.6234661280 +37 44 05.673510636   17.027 15.745   14.410 ~ 12 0
11 NGC 6791 2042 RG* 19 20 43.6819494240 +37 46 41.694843468   16.428 14.985   13.502 ~ 25 0
12 Cl* NGC 6791 SBG 5454 RG* 19 20 45.1752914208 +37 44 33.991699668   16.312 14.915   13.508 dC 43 0
13 Cl* NGC 6791 SBG 5796 RG* 19 20 46.2483052344 +37 49 10.567694640   16.566 15.223   13.867 ~ 42 0
14 Cl* NGC 6791 SBG 7347 RG* 19 20 50.8241339976 +37 43 29.274967596   16.474 15.099   13.718 ~ 18 0
15 NGC 6791 1401 RG* 19 20 51.4411825392 +37 46 40.886332608   16.65 15.26   13.969 ~ 23 0
16 NGC 6791 1414 RG* 19 20 52.4354258184 +37 47 15.247848552   17.03 15.85   14.380 K3III 29 0
17 NGC 6791 3010 RG* 19 20 52.5951190526 +37 44 28.225981470   15.729 14.136   12.373 M0.0III 62 0
18 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
19 NGC 6791 1418 RG* 19 20 53.5840602096 +37 47 18.848054256   16.507 15.117   13.720 ~ 22 0
20 NGC 6791 1308 RG* 19 20 54.1848898914 +37 46 28.557262230   16.059 14.554   12.988 M0.0III 22 0
21 KOI-3920 RG* 19 20 54.9957921336 +37 45 41.047901316   16.739 15.382   14.025 ~ 24 0
22 NGC 6791 3018 RG* 19 20 55.3072689384 +37 43 15.284180028   16.032 14.557   13.027 K4III 43 0
23 Cl* NGC 6791 SBG 9786 RG* 19 20 57.7101815688 +37 49 01.226018208   16.791 15.435   14.065 C: 34 0
24 KOI-4940 RG* 19 20 57.8519081376 +37 47 06.743040972   16.866 15.520   14.170 ~ 35 0
25 Cl* NGC 6791 SBG 10407 RG* 19 20 59.5893586512 +37 48 10.811691504   16.840 15.498   14.158 ~ 31 0
26 Cl* NGC 6791 SBG 10674 RG* 19 21 00.4402905216 +37 47 16.106023932   16.990 15.646   14.290 ~ 13 0
27 Cl* NGC 6791 SBG 10898 RG* 19 21 01.1211981504 +37 42 13.462608672   15.949 14.459   12.890 M0e 51 0
28 Cl* NGC 6791 SBG 11006 RG* 19 21 01.4516544408 +37 48 05.187396816   17.081 15.777   14.467 ~ 27 0
29 Cl* NGC 6791 SBG 11598 RG* 19 21 03.4740147528 +37 46 37.593336612   17.092 15.792   14.491 ~ 12 0
30 Cl* NGC 6791 SBG 11797 RG* 19 21 04.1779730088 +37 46 22.671146820   16.953 15.653   14.359 ~ 20 0
31 Cl* NGC 6791 SBG 11862 RG* 19 21 04.4210434848 +37 46 09.852731796   16.851 15.547   14.257 ~ 17 0
32 Cl* NGC 6791 SBG 11895 RG* 19 21 04.5534449256 +37 46 53.440027968   16.967 15.651   14.337 ~ 20 0
33 Cl* NGC 6791 SBG 12249 RG* 19 21 05.9536498512 +37 47 57.778493424   16.749 15.385   14.009 ~ 17 0
34 Cl* NGC 6791 SBG 12836 RG* 19 21 08.1159547944 +37 45 32.157611316   16.771 15.428   14.082 ~ 19 0
35 Cl* NGC 6791 SBG 13847 RG* 19 21 13.0026379512 +37 43 00.518637792   16.694 15.322   13.957 ~ 43 0
36 NGC 6811 OpC 19 37 21.8 +46 22 43   7.47 6.8     ~ 435 0
37 NGC 6819 27 RG* 19 40 36.8439134770 +40 15 17.244926338     14.130   12.96 ~ 50 0
38 NGC 6819 765 RG* 19 40 48.0357775068 +40 08 08.462359969     12.850   11.48 K1.5III 61 0
39 NGC 6819 112 RG* 19 40 49.6541452533 +40 14 31.281979204     13.370   12.09 G5III 53 0
40 NGC 6819 506 RG* 19 40 53.5408518104 +40 10 02.391020773     13.960   12.78 ~ 22 0
41 NGC 6819 138 RG* 19 40 56.0080076374 +40 13 39.553372067     14.080   12.90 K1IV 64 0
42 NGC 6819 510 RG* 19 40 57.0425593485 +40 10 06.814776515     13.320   12.00 ~ 40 0
43 NGC 6819 490 RG* 19 41 06.2142791232 +40 10 53.271517764     14.070   12.88 ~ 44 0
44 NGC 6819 748 RG* 19 41 09.9471238046 +40 09 05.588999713     14.320   13.15 K0II 44 0
45 NGC 6819 425 RG* 19 41 12.2411468160 +40 11 33.884441484     13.280   11.97 ~ 28 0
46 NGC 6819 424 RG* 19 41 12.8159953752 +40 11 29.395787928     13.900   12.68 ~ 24 0
47 NGC 6819 616 RG* 19 41 15.6410633736 +40 10 10.544991672   14.17 13.24   11.94 ~ 41 0
48 2MASS J19411575+4011359 RG* 19 41 15.7478452034 +40 11 35.965490655     13.980 13.730 12.73 ~ 27 0
49 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
50 NGC 6819 395 RG* 19 41 18.7601297064 +40 11 54.749608539   14.82 13.64 13.393 12.43 ~ 26 0
51 NGC 6819 472 RG* 19 41 21.3616104480 +40 11 00.221213472     13.120   11.79 ~ 40 0
52 NGC 6819 389 RG* 19 41 21.7633631736 +40 12 11.168954028     13.190   11.87 ~ 42 0
53 2MASS J19412222+4016442 RG* 19 41 22.2248500176 +40 16 44.214161520     13.280   11.89 ~ 52 0
54 Cl* NGC 6819 P 17 RG* 19 41 27.0761609688 +40 12 28.325639880   13.88 12.63   11.25 ~ 53 0
55 NGC 6819 178 RG* 19 41 29.4199026024 +40 14 19.955558616     13.220   11.89 ~ 44 0
56 Cl* NGC 6819 P 30 RG* 19 41 33.3070583268 +40 12 34.864776176   14.53 13.18   11.84 K1IV 57 0
57 NGC 6819 943 RG* 19 41 44.2720729835 +40 05 52.654892437     13.080   11.74 K2III 55 0
58 2MASS J19415064+4016010 RG* 19 41 50.6467280448 +40 16 01.023131640     14.310   13.12 ~ 53 0
59 NGC 6866 OpC 20 03 57.7 +44 10 22   8.04 7.6     ~ 185 0

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