2013MNRAS.430..221A


Query : 2013MNRAS.430..221A

2013MNRAS.430..221A - Mon. Not. R. Astron. Soc., 430, 221-233 (2013/March-3)

NGC 2849 and NGC 6134: two more BOCCE open clusters.

AHUMADA A.V., CIGNONI M., BRAGAGLIA A., DONATI P., TOSI M. and MARCONI G.

Abstract (from CDS):

We present CCD photometry of two southern open clusters. As part of the Bologna Open Cluster Chemical Evolution project we obtained BVI and UBVI imaging for NGC 2849 and NGC 6134, respectively. By means of the synthetic colour-magnitude diagram method and using various evolutionary sets of stellar evolution tracks with various metallicities, we determined at the same time age, distance and reddening. We also determined an approximate metallicity for NGC 2849, for which the information is not available from sounder methods like high-resolution spectroscopy. NGC 2849 turned to be 0.85-1.0Gyr old with a solar metallicity. The foreground reddening is E(B - V) = 0.28 - 0.32, and the true distance modulus (m - M)0 = 13.8-13.9. For NGC 6134 we did not obtain fully consistent answers from the V, B - V and V, V - I photometry, an unexpected problem, since both the metallicity and the reddening are known (from high-resolution spectroscopy and the U - B, B - V two colours diagram, respectively). This may either indicate a difficulty of current models (evolutionary tracks and/or models of atmosphere) to accurately reproduce colours, or be related to differences in the metal mixture assumed by the models and those of the clusters. Assuming the spectroscopic abundance and the colour excess [E(B - V) = 0.35] from the U - B,B - V plot, we derived a best age between 0.82 and 0.95Gyr and a distance modulus 10.5. In agreement with previous studies, the NGC 6134 colour-magnitude diagram shows also a clear main sequence gap at V ∼ 15 and B-V ∼ 0.9-1.0 that is unexplained by canonical stellar evolution models.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): Hertzsprung-Russell and colour-magnitude diagrams - open clusters and associations: general - open clusters and associations: individual: NGC 2849 - open clusters and associations: individual: NGC 6134

VizieR on-line data: <Available at CDS (J/MNRAS/430/221): ngc2849.dat ngc6134.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 24

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Number of rows : 24
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 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3279 0
2 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2928 0
3 NGC 1817 OpC 05 12 33 +16 41.8           ~ 171 0
4 Cl Berkeley 17 OpC 05 20 31 +30 34.4           ~ 162 0
5 NGC 2112 OpC 05 53 48 +00 24.2     9.1     ~ 83 0
6 NGC 2168 OpC 06 09 05 +24 20.2           ~ 525 0
7 Cl Berkeley 29 OpC 06 53 04.2 +16 55 39   14.3       ~ 167 0
8 NGC 2420 OpC 07 38 24 +21 34.5   9.0 8.3     ~ 456 0
9 Cl Berkeley 39 OpC 07 46 48 -04 39.9           ~ 178 1
10 NGC 2477 OpC 07 52 11 -38 32.2   6.64 5.8     ~ 277 0
11 NGC 2539 OpC 08 10 38 -12 50.0   7.05 6.5     ~ 136 0
12 NGC 2548 OpC 08 13 39 -05 43.6           ~ 169 0
13 NGC 2571 OpC 08 18 54 -29 46.5   7.16 7.0     ~ 74 0
14 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2233 0
15 NGC 2849 OpC 09 19.4 -40 31     12.5     ~ 29 0
16 PG 0918+029 HS* 09 21 28.2138172968 +02 46 02.254084824 11.975 13.056 13.327 13.456 13.615 sdB1VIIHe6 105 0
17 PG 1323-086 HS* 13 25 39.4669501176 -08 49 19.067387484 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 138 1
18 NGC 6134 OpC 16 27 49 -49 09.7   7.89 7.2     ~ 145 0
19 PG 1657+078 HS* 16 59 32.2150744512 +07 43 31.412466912 13.919 14.877 15.019 15.098 15.115 sdB 51 0
20 IC 4651 OpC 17 24 51 -49 55.0           ~ 339 0
21 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13430 0
22 NGC 6705 OpC 18 51 04 -06 16.3   6.32 5.8     ~ 398 0
23 NGC 7142 OpC 21 45 10.0 +65 46 18   10.36 9.3     ~ 135 0
24 NGC 7245 OpC 22 15 15.0 +54 19 58   9.81 9.2     ~ 54 0

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2023.01.29-16:10:02

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