2007AJ....134.1216J

Query : 2007AJ....134.1216J

2007AJ....134.1216J - Astron. J., 134, 1216-1230 (2007/September-0)

Na, al, and O abundances of open clusters NGC 7142, NGC 6939, and IC 4756.

JACOBSON H.R., FRIEL E.D. and PILACHOWSKI C.A.

Abstract (from CDS):

We present an analysis of echelle spectra of stars in three open clusters obtained with the Hydra multiobject spectrograph on the WIYN 3.5 m telescope. Abundances of Fe, O, Si, Ca, Na, Al, and Ni have been determined via equivalent width analysis and spectrum synthesis. Mean abundances for each cluster are compared to those of previous studies and of other clusters in the literature, with emphasis on exploring the enhancements of Na and Al seen in many open clusters. All three clusters show enhanced values of [Na/Fe] and [Al/Fe], while the abundances of Fe, O, Si, and Ca are consistent with their ages and locations in the Galactic disk.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Abundances - open clusters and associations: individual (NGC 7142) - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 6939 - Galaxy: Open Clusters and Associations: Individual: Alphanumeric: IC 4756 - Stars: Abundances

VizieR on-line data: <Available at CDS (J/AJ/134/1216): stars.dat table4.dat>

Simbad objects: 39

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Number of rows : 39
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 1502 OpC 04 07 49.4 +62 19 35   7.47 6.9     ~ 202 1
2 Cl Berkeley 17 OpC 05 20 30.5 +30 34 20           ~ 192 0
3 Cl Berkeley 29 OpC 06 53 03.6 +16 55 24   14.3       ~ 187 0
4 NAME Saurer A Cluster OpC 07 20.9 +01 48           ~ 70 0
5 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
6 Cl Collinder 261 OpC 12 38 04.7 -68 22 40     10.7     ~ 216 0
7 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
9 BD+05 3835 * 18 37 30.2982427272 +05 12 15.715653660 10.47 10.85 9.77     G5 43 0
10 BD+05 3837 * 18 37 32.3311383120 +05 17 22.472474460 9.79 10.13 9.33     ~ 43 0
11 BD+05 3839 * 18 37 34.2155606904 +05 28 33.420811116 10.30 10.50 9.46     ~ 48 0
12 BD+05 3850 SB* 18 38 05.1613660152 +05 24 33.720370164 10.02 10.29 9.24     K0 32 0
13 IC 4756 88 * 18 38 28.5549064416 +05 03 46.114891956   11.09 10.50     ~ 10 0
14 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0
15 BD+05 3868 * 18 38 43.7886124608 +05 14 19.935885012 10.05 10.38 9.36     G 46 0
16 BD+05 3873 * 18 38 52.9301191680 +05 20 16.508925924 9.93 10.10 9.05     K0 55 0
17 BD+05 3882 * 18 39 17.8751122128 +05 13 48.737856648 10.09 10.37 9.36     G0 48 0
18 BD+05 3888 SB* 18 39 26.5985220072 +05 21 31.862574000 10.42 10.70 9.67     G2 19 0
19 NGC 6939 36 * 20 30 46.5435968808 +60 41 26.053324188   13.25 12.31 12.55   ~ 4 0
20 NGC 6939 53 * 20 31 01.6 +60 42 14   14.16 12.86     ~ 7 0
21 NGC 6939 59 * 20 31 04.7277148608 +60 37 09.108555204   12.99 12.55     ~ 7 0
22 2MASS J20310597+6042139 RG* 20 31 05.9725006344 +60 42 13.823912016   13.85 12.55     ~ 13 0
23 V* V465 Cep LP* 20 31 12.6733908336 +60 40 31.144727028   14.4 13.90     ~ 6 0
24 NGC 6939 121 * 20 31 24.3038962824 +60 37 43.127551776   13.50 12.41     ~ 17 0
25 NGC 6939 135 * 20 31 27.1425385272 +60 38 50.967426660   13.69 12.58     ~ 9 0
26 NGC 6939 182 * 20 31 34.4875422168 +60 39 06.107373756   14.29 12.92     ~ 9 0
27 2MASS J20314054+6037084 RG* 20 31 40.5499836264 +60 37 08.207863428   13.72 12.03     ~ 19 0
28 NGC 6939 OpC 20 31 40.6 +60 38 54           ~ 171 0
29 2MASS J20314339+6040386 RG* 20 31 43.3985941032 +60 40 38.518351536   14.22 12.90     ~ 15 0
30 NGC 6939 292 * 20 31 59.0930315376 +60 42 04.462553448   14.55 13.19     ~ 14 0
31 Cl* NGC 7142 CT 399 * 21 44 36.6995565120 +65 43 19.179793092   14.823 13.448   11.917 ~ 4 0
32 Cl* NGC 7142 HOAG 10 * 21 45 00.7326513600 +65 45 56.526864876 16.01 14.816 13.452   11.984 ~ 19 0
33 NGC 7142 OpC 21 45 10.2 +65 47 05   10.36 9.3     ~ 157 0
34 Cl* NGC 7142 HOAG 16 * 21 45 20.4358526904 +65 48 31.000447476 16.27 15.123 13.743   12.217 ~ 12 0
35 Cl* NGC 7142 CT 203 * 21 45 32.9406758256 +65 47 31.137016092   15.091 13.765   12.618 ~ 8 0
36 NGC 6939 83 * ~ ~   15.58 14.50     ~ 1 0
37 IC 4756 254 * ~ ~   12.66 11.59     ~ 1 0
38 NGC 6939 31 * ~ ~   12.99 11.16     ~ 6 0
39 IC 4756 1356 * ~ ~   13.38 11.42     ~ 1 0

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