2008MNRAS.386.1625C

Query : 2008MNRAS.386.1625C

2008MNRAS.386.1625C - Mon. Not. R. Astron. Soc., 386, 1625-1634 (2008/May-3)

The old open cluster NGC 2112: updated estimates of fundamental parameters based on a membership analysis.

CARRARO G., VILLANOVA S., DEMARQUE P., MONI BIDIN C. and McSWAIN M.V.

Abstract (from CDS):

We report on a new, wide-field (20x20 arcmin2), multicolour (UBVI), photometric campaign in the area of the nearby old open cluster NGC 2112. At the same time, we provide medium-resolution spectroscopy of 35 (and high-resolution of additional 5) red giant and turn-off stars. This material is analysed with the aim to update the fundamental parameters of this traditionally difficult cluster, which is very sparse and suffers from heavy field star contamination. Among the 40 stars with spectra, we identified 21 bona fide radial velocity members which allow us to put more solid constraints on the cluster's metal abundance, long suggested to be as low as the metallicity of globulars. As indicated earlier by us on a purely photometric basis, the cluster [Fe/H] abundance is slightly supersolar ([Fe/H] = 0.16±0.03) and close to the Hyades value, as inferred from a detailed abundance analysis of three of the five stars with higher resolution spectra. Abundance ratios are also marginally supersolar.

Based on this result, we revise the properties of NGC 2112 using stellar models from the Padova and Yale-Yonsei groups.

For this metal abundance, we find that the cluster's age, reddening and distance values are 1.8 Gyr, 0.60 mag and 940 pc, respectively. Both the Yale-Yonsei and Padova models predict the same values for the fundamental parameters within the errors.

Overall, NGC 2112 is a typical solar neighbourhood, thin-disc star cluster, sharing the same chemical properties of F-G stars and open clusters close to the Sun.

This investigation outlines the importance of a detailed membership analysis in the study of disc star clusters.


Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): open clusters and associations: general - open clusters and associations: individual: NGC 2112

VizieR on-line data: <Available at CDS (J/MNRAS/386/1625): table3.dat>

Nomenclature: Tables 2-6: Cl* NGC 2112 CVD NNNN N=- among (Nos 101-1140).

Simbad objects: 63

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Number of rows : 63
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 V* T Phe Mi* 00 30 26.2337742744 -46 24 33.379722396   12.46 11.43 12.43   M7e 76 0
2 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
3 Cl* NGC 2112 CVD 101 * 05 53 11.7886527792 +00 18 43.985838780 17.409 15.983 14.363   12.476 ~ 1 0
4 Cl* NGC 2112 CVD 124 * 05 53 13.2800583480 +00 26 21.386530644 17.397 16.204 14.873   13.226 ~ 1 0
5 Cl* NGC 2112 CVD 167 * 05 53 16.0386078096 +00 15 07.392029256 16.433 15.000 13.313   11.315 ~ 12 0
6 Cl* NGC 2112 CVD 185 * 05 53 17.1709229568 +00 25 00.607111788 16.269 15.834 14.852   13.501 ~ 7 0
7 Cl* NGC 2112 CVD 244 * 05 53 22.1168728680 +00 21 24.130707876 15.913 15.433 14.407   13.026 ~ 11 0
8 NGC 2112 224 * 05 53 23.6665084776 +00 15 36.673883964 17.100 15.76 14.13   11.987 ~ 3 0
9 Cl* NGC 2112 CVD 274 * 05 53 24.7581722016 +00 27 19.914860304 16.907 16.094 14.909   13.247 ~ 8 0
10 NGC 2112 120 * 05 53 27.0755576232 +00 23 33.682641072 16.059 15.28 14.25   12.583 ~ 16 0
11 Cl* NGC 2112 CVD 323 * 05 53 28.2525146472 +00 25 10.166243916 16.715 16.057 14.896   13.305 ~ 5 0
12 Cl* NGC 2112 CVD 340 * 05 53 29.1626946000 +00 29 37.683630996 16.264 15.418 14.246   12.655 ~ 11 0
13 BD+00 1204 * 05 53 31.4574425280 +00 27 19.049033340 14.91 12.29 10.04     M1 9 0
14 Cl* NGC 2112 CVD 399 * 05 53 32.4627693504 +00 23 49.537134816 15.600 15.073 13.998   12.518 ~ 10 0
15 Cl* NGC 2112 CVD 417 * 05 53 33.3700208040 +00 22 53.643778824 16.547 15.369 13.882   12.052 ~ 10 0
16 NGC 2112 216 * 05 53 33.7072935696 +00 17 43.572367680 16.51 15.05 13.39   11.435 ~ 10 0
17 Cl* NGC 2112 CVD 443 * 05 53 34.8095698248 +00 16 16.637693592 16.550 15.505 14.037   12.275 ~ 11 0
18 Cl* NGC 2112 CVD 478 * 05 53 37.0412604768 +00 21 12.901019436 15.528 14.988 13.898   12.428 ~ 11 0
19 NGC 2112 110 Pe* 05 53 39.0143181264 +00 27 51.008571576 15.17 14.56 13.44   11.805 ~ 3 0
20 NGC 2112 226 * 05 53 40.5968249856 +00 18 31.948356096 15.326 15.04 13.73   12.317 ~ 16 0
21 NGC 2112 227 * 05 53 40.9432309968 +00 18 17.766595800 15.307 14.820 13.824   12.458 ~ 8 0
22 Cl* NGC 2112 CVD 566 * 05 53 42.3162641496 +00 24 46.617610500 16.006 15.561 14.539   13.141 ~ 11 0
23 Cl* NGC 2112 CVD 577 * 05 53 42.7347158352 +00 16 10.932687120 16.016 15.512 14.454   13.036 ~ 11 0
24 Cl* NGC 2112 CVD 580 * 05 53 42.8536541688 +00 29 55.826173068 15.317 14.807 13.739   12.380 ~ 2 0
25 NGC 2112 106 * 05 53 43.2358673232 +00 25 06.054479508 12.78 12.48 11.76     ~ 3 0
26 NGC 2112 102 * 05 53 43.7747229024 +00 23 56.809405644 15.00 14.57 13.53   12.105 ~ 6 0
27 NGC 2112 202 * 05 53 44.4012942024 +00 23 01.117407336 15.13 14.75 13.75   12.302 ~ 8 0
28 Cl* NGC 2112 CVD 655 * 05 53 47.3819676384 +00 26 16.939992624 16.416 14.877 13.155   11.036 ~ 12 0
29 NGC 2112 OpC 05 53 47.5 +00 24 18     9.1     ~ 109 0
30 NGC 2112 204 * 05 53 47.5357962456 +00 22 01.923777372 15.337 13.491 11.724   9.663 ~ 17 0
31 Cl* NGC 2112 CVD 707 * 05 53 50.3113284480 +00 25 22.475905860 15.495 15.148 14.202   12.900 ~ 8 0
32 NGC 2112 401 SB* 05 53 50.5491587016 +00 24 51.116634324 14.98 13.81 12.30     ~ 13 0
33 NGC 2112 301 * 05 53 50.7354634056 +00 23 19.159648080 15.672 15.40 14.17   12.843 ~ 9 0
34 Cl* NGC 2112 CVD 717 * 05 53 50.9642971848 +00 25 31.193474412 15.676 15.308 14.336   12.998 ~ 11 0
35 NGC 2112 220 * 05 53 51.2090554032 +00 17 22.803639180 14.08 13.70 12.85     ~ 3 0
36 Cl* NGC 2112 CVD 737 * 05 53 51.9130083288 +00 24 34.234401744 15.526 15.143 14.157   12.825 ~ 9 0
37 NGC 2112 303 * 05 53 52.8331993176 +00 22 18.944022900 14.29 13.85 12.90     ~ 2 0
38 NGC 2112 402 SB* 05 53 53.2973805552 +00 24 37.738509876 14.09 12.53 11.11 11.16   ~ 21 0
39 Cl* NGC 2112 CVD 770 * 05 53 53.6579811144 +00 18 56.956940100 16.235 15.794 14.767   13.379 ~ 1 0
40 NGC 2112 304 * 05 53 54.3821926104 +00 21 01.479693852 15.466 15.56 14.17   11.883 ~ 2 0
41 Cl* NGC 2112 CVD 794 * 05 53 55.0373097960 +00 24 08.466464880 15.727 15.293 14.280   12.884 ~ 7 0
42 NGC 2112 413 * 05 53 56.6933252784 +00 25 25.214545272 15.698 15.42 14.37   13.056 ~ 12 0
43 NGC 2112 407 * 05 53 57.2932170144 +00 26 06.591019164 16.681 15.56 14.37   12.402 ~ 12 0
44 Cl* NGC 2112 CVD 890 * 05 53 59.9410571040 +00 23 12.840483264 15.393 15.019 14.051   12.728 ~ 8 0
45 NGC 2112 306 * 05 54 01.5280418448 +00 19 07.486155660 16.74 16.27 15.16     ~ 9 0
46 Cl* NGC 2112 CVD 917 * 05 54 02.0482129008 +00 24 56.856329748 16.075 15.724 14.757   13.436 ~ 8 0
47 NGC 2112 310 * 05 54 03.1918259328 +00 23 00.014659692 16.546 15.20 13.52   11.505 ~ 12 0
48 Cl* NGC 2112 CVD 936 V* 05 54 03.2388271896 +00 24 17.272342692 15.987 15.671 14.719   13.384 ~ 9 0
49 NGC 2112 318 * 05 54 04.9662303960 +00 16 21.995110668 15.92 14.91 13.42     ~ 6 0
50 NGC 2112 317 * 05 54 12.3467372784 +00 17 53.046106404 16.58 13.94 11.79     ~ 7 0
51 NGC 2112 316 * 05 54 21.0448636488 +00 19 48.370224612 17.22 14.45 12.34     ~ 17 0
52 Cl* NGC 2112 CVD 1140 * 05 54 22.6776605040 +00 21 33.193432080   14.947 13.964   12.581 ~ 2 0
53 NGC 2360 OpC 07 17 45.8 -15 38 21           ~ 213 0
54 RL 149 HS* 07 24 14.3741784768 -00 33 04.165016904 12.958 13.737 13.866 13.906 13.974 sdB 114 0
55 Cl Collinder 261 OpC 12 38 04.7 -68 22 40     10.7     ~ 216 0
56 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
57 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
58 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
59 NGC 2112 118 * ~ ~ 16.43 15.91 14.92     ~ 2 0
60 NGC 2112 101 * ~ ~ 12.43 12.05 11.47     ~ 2 0
61 NGC 2112 308 * ~ ~   16.00 14.26     ~ 2 0
62 NGC 2112 416 * ~ ~   13.68 12.65     ~ 7 0
63 NGC 2112 309 * ~ ~ 15.94 15.34 14.12     ~ 2 0

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