2014A&A...562A..39C


Query : 2014A&A...562A..39C

2014A&A...562A..39C - Astronomy and Astrophysics, volume 562A, 39-39 (2014/2-1)

Chemical abundance analysis of the old, rich open cluster Trumpler 20.

CARRARO G., VILLANOVA S., MONACO L., BECCARI G., AHUMADA J.A. and BOFFIN H.M.J.

Abstract (from CDS):

Trumpler 20 is an open cluster located at low Galactic longitude, just beyond the great Carina spiral arm, and whose metallicity and fundamental parameters were very poorly known until now. As it is most likely a rare example of an old, rich open cluster - possibly a twin of NGC 7789 - it is useful to characterize it. To this end, we determine here the abundance of several elements and their ratios in a sample of stars in the clump of Trumpler 20. We present high-resolution spectroscopy of eight clump stars. Based on their radial velocities, we identify six bona fide cluster members, and for five of them (the sixth being a fast rotator) we perform a detailed abundance analysis. We find that Trumpler 20 is slightly more metal-rich than the Sun, having [Fe/H]=+0.09±0.10. The abundance ratios of α-elements are generally solar. In line with recent studies of clusters as old as Trumpler 20, Ba is overabundant compared to the Sun. Our analysis of the iron-peak elements (Cr and Ni) does not reveal anything anomalous. Based on these results, we re-estimate the cluster age to be 1.5+0.2–0.1Gyr. Its distance to the Galactic centre turns out to be 7.3kpc. With this distance and metallicity, Trumpler 20 fits fairly well in the metallicity gradient for the Galactic inner disc. With this new study, the characterization of Trumpler 20 is now on much more solid ground. Further studies should focus on the estimate of the binary fraction and on its main sequence membership.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Trumpler 20 - Hertzsprung-Russell and C-M diagrams - stars: abundances

CDS comments: Cl* Trumpler 20 MG 207 and Cl* Trumpler 20 MG 429 have wrong coordinates in this paper.

Simbad objects: 17

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Number of rows : 17
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 NGC 2158 OpC 06 07 27 +24 05.9           ~ 279 0
2 NAME Car Arm PoG 10 00 -60.0           ~ 420 1
3 Cl* Trumpler 20 PMF 4260 HB* 12 39 12.0124772160 -60 36 32.167665396 15.683 16.022 14.690   13.436 ~ 13 0
4 Cl Trumpler 20 OpC 12 39 32 -60 38.2           ~ 100 0
5 Cl* Trumpler 20 PMF 4453 * 12 39 37.7211292344 -60 36 02.158483212 15.685 16.175 14.861   13.586 ~ 6 0
6 Cl* Trumpler 20 PMF 3994 * 12 39 39.9761035152 -60 37 09.607387728 15.774 16.098 14.767   13.504 ~ 5 0
7 Cl* Trumpler 20 MG 675 * 12 39 45.9878858016 -60 37 42.218309748   15.146 13.625   11.983 ~ 8 0
8 Cl* Trumpler 20 PMF 5705 * 12 39 55.5819375144 -60 33 00.524619216 15.555 16.025 14.697   13.433 ~ 3 0
9 Cl* Trumpler 20 PMF 4738 * 12 40 01.1591151048 -60 35 21.854484456 15.679 16.008 14.615   13.302 ~ 11 0
10 Cl* Trumpler 20 PMF 6479 * 12 40 11.4239067792 -60 30 42.734041524 15.771 16.127 14.731   13.390 ~ 6 0
11 * 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 2257 0
12 NGC 6192 OpC 16 40 18 -43 21.3           ~ 84 0
13 NGC 6404 OpC 17 39 40 -33 13.4     10.6     ~ 43 0
14 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13430 0
15 NGC 6583 OpC 18 15 51 -22 08.6     10.0     ~ 66 0
16 NGC 6705 OpC 18 51 04 -06 16.3   6.32 5.8     ~ 398 0
17 NGC 7789 OpC 23 57 20 +56 43.6   7.68 6.7     ~ 497 0

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2023.01.29-16:59:07

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