2010A&A...509A.102V


Query : 2010A&A...509A.102V

2010A&A...509A.102V - Astronomy and Astrophysics, volume 509, A102-102 (2010/1-1)

The metallicity of the open cluster Tombaugh 2.

VILLANOVA S., RANDICH S., GEISLER D., CARRARO G. and COSTA E.

Abstract (from CDS):

Open clusters are excellent tracers of the structure, kinematics, and chemical evolution of the disk and a wealth of information can be derived from the spectra of their constituent stars. We investigate the nature of the chemical composition of the outer disk open cluster Tombaugh 2. This has been suggested to be a member of the GASS/Mon substructure, and a recent study by Frinchaboy et al. (2008MNRAS.391...39F) suggested that this was a unique open cluster in possessing an intrinsic metal abundance dispersion. We aim to investigate such claims. High resolution VLT+GIRAFFE spectra in the optical are obtained and analyzed for a number of stars in the Tombaugh 2 field, together with independent UBVIC photometry. Radial velocities and position in the color-magnitude diagram are used to assess cluster membership. The spectra, together with input atmospheric parameters and model atmospheres, are used to determine detailed chemical abundances for a variety of elements in 13 members with good spectra. We find the mean metallicity to be [Fe/H]=-0.31±0.02 with no evidence for an intrinsic abundance dispersion, in contrary to the recent results of Frinchaboy et al. (2008MNRAS.391...39F). We find Ca and Ba to be slightly enhanced, while Ni and Sc are solar. The r-process element Eu was found to be enhanced, giving an average [Eu/Ba]=+0.17. The Li abundance decreases with Teff on the upper giant branch and maintains a low level for red clump stars. The mean metallicity we derive agrees well with that expected from the radial abundance gradient in the disk for a cluster at its Galactocentric distance. Tombaugh 2 is found to have abundances as expected from its Galactocentric distance and no evidence for any intrinsic metallicity dispersion. The surprising result found by Frinchaboy et al. (2008MNRAS.391...39F), which is the presence of two distinct abundance groups within the cluster, implying either a completely unique open cluster with an intrinsic metallicity spread or a very unlikely superposition of a cold stellar stream and a very distant open cluster, is not supported by our new result.

Abstract Copyright:

Journal keyword(s): Galaxy: disk - open clusters and associations: general - open clusters and associations: individual: Tombaugh 2 - Galaxy: structure

Nomenclature: Tables 1, 3, 5: [VRG2010] NNNN N=13+24 among (Nos 153-4708).

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16507 1
2 NAME Gal Anticenter reg 05 46 +28.9           ~ 838 0
3 [VRG2010] 1530 * 07 02 41.990 -20 50 51.90     15.448     ~ 1 0
4 [VRG2010] 651 * 07 02 42.170 -20 46 05.20     15.921     ~ 1 0
5 [VRG2010] 2911 * 07 02 42.790 -20 43 33.00     15.485     ~ 1 0
6 [VRG2010] 2822 * 07 02 48.850 -20 44 10.70     16.412     ~ 1 0
7 [VRG2010] 2343 * 07 02 51.110 -20 47 15.10     15.966     ~ 1 0
8 [VRG2010] 2185 * 07 02 53.300 -20 48 01.20     16.286     ~ 1 0
9 2MASS J07025394-2050097 RG* 07 02 53.9393538936 -20 50 09.765540024     15.947   14.504 ~ 5 0
10 Cl* Tombaugh 2 KKKM 39 * 07 02 55.2068913048 -20 49 20.887321800   17.112 15.915   14.554 ~ 5 0
11 2MASS J07025549-2051154 RG* 07 02 55.4893895472 -20 51 15.494975676     15.919   14.451 ~ 5 0
12 2MASS J07025815-2044028 RG* 07 02 58.1566455456 -20 44 02.840720820 17.730 17.183 16.017   14.97 ~ 4 0
13 [VRG2010] 2975 * 07 02 58.300 -20 43 04.70     15.789     ~ 1 0
14 2MASS J07025868-2050560 RG* 07 02 58.6882033416 -20 50 56.151604608 19.185 18.063 16.857   15.80 ~ 3 0
15 [VRG2010] 1755 * 07 02 59.7351214324 -20 49 49.564431758     14.790     ~ 3 0
16 2MASS J07025974-2049334 RG* 07 02 59.7482583864 -20 49 33.430025712   17.281 15.981   14.527 ~ 6 0
17 [VRG2010] 3332 * 07 03 00.310 -20 46 42.50     16.991     ~ 1 0
18 [VRG2010] 390 * 07 03 01.3442327832 -20 49 27.000781860     16.032     ~ 4 0
19 Cl* Tombaugh 2 KKKM 65 * 07 03 02.6546346936 -20 48 23.667364296   17.478 16.256   14.901 ~ 6 0
20 Cl* Tombaugh 2 KKKM 71 * 07 03 04.0326203760 -20 49 07.893303276   17.589 16.341   14.934 ~ 6 0
21 [VRG2010] 3562 * 07 03 04.4706680137 -20 49 18.276446650     15.877     ~ 3 0
22 2MASS J07030463-2048129 RG* 07 03 04.6298014920 -20 48 12.921131484 18.338 17.634 16.501   15.20 ~ 3 0
23 [VRG2010] 153 * 07 03 05.210 -20 52 45.30     16.990     ~ 1 0
24 Cl Haffner 2 OpC 07 03 06 -20 49.2           ~ 125 0
25 2MASS J07030612-2050308 RG* 07 03 06.1296543552 -20 50 30.855320088   17.227 15.721   14.191 ~ 6 0
26 [VRG2010] 250 * 07 03 09.440 -20 51 01.60     17.132     ~ 1 0
27 UCAC2 23561920 * 07 03 10.3524315792 -20 47 59.306926416 17.677 16.975 15.857     ~ 4 0
28 Cl* Tombaugh 2 PJM 109 * 07 03 13.7244935952 -20 52 58.525977360     15.705   14.297 ~ 2 0
29 UCAC4 346-021227 * 07 03 14.1140570400 -20 52 47.516387196   15.557 13.788 13.368   ~ 4 0
30 Cl* Tombaugh 2 PJM 89 * 07 03 15.4246871664 -20 52 25.919866632     15.455   14.009 ~ 5 0
31 2MASS J07032050-2046476 RG* 07 03 20.4975549360 -20 46 47.640016452     16.160   14.724 ~ 3 0
32 [VRG2010] 2827 * 07 03 20.740 -20 44 06.10     17.007     ~ 1 0
33 [VRG2010] 589 * 07 03 23.3974351112 -20 46 49.320465524     16.109     ~ 3 0
34 [VRG2010] 472 * 07 03 24.740 -20 48 13.30     15.367     ~ 1 0
35 [VRG2010] 2510 * 07 03 26.870 -20 46 16.90     17.359     ~ 1 0
36 UCAC3 139-48054 * 07 03 27.5117527272 -20 51 15.158453220 17.729 17.060 15.919     ~ 4 0
37 [VRG2010] 266 * 07 03 32.500 -20 50 48.00     15.820     ~ 1 0
38 [VRG2010] 1573 * 07 03 33.150 -20 50 30.40     15.781     ~ 1 0
39 [VRG2010] 650 * 07 03 33.970 -20 46 00.30     15.736     ~ 1 0
40 [VRG2010] 2403 * 07 03 34.300 -20 46 52.80     15.596     ~ 1 0
41 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1364 0
42 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3299 0
43 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1784 0
44 NAME Monoceros Stream St* ~ ~           ~ 344 1

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2023.01.30-02:30:35

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