2014A&A...568A..86C


Query : 2014A&A...568A..86C

2014A&A...568A..86C - Astronomy and Astrophysics, volume 568A, 86-86 (2014/8-1)

Abundance analysis of red clump stars in the old, inner disc, open cluster NGC 4337: a twin of NGC 752?

CARRARO G., MONACO L. and VILLANOVA S.

Abstract (from CDS):

Open star clusters older than ∼1Gyr are rare in the inner Galactic disc. Still, they are objects that hold crucial information for probing the chemical evolution of these regions of the Milky Way. We aim at increasing the number of old open clusters in the inner disc for which high-resolution metal abundances are available. Here we report on NGC 4337, which was recently discovered to be an old, inner disc open cluster. We present the very first high-resolution spectroscopy of seven clump stars that are all cluster members. We performed a detailed abundance analysis for them. We find that NGC 4337 is marginally more metal-rich than the Sun, with [Fe/H]=+0.12±0.05. The abundance ratios of α-elements are generally solar. At odds with recent studies on intermediate-age and old open clusters in the Galactic disc, Ba is under-abundant in NGC 4337 compared with the Sun. Our analysis of the iron-peak elements (Cr and Ni) does not reveal anything anomalous. Based on these results, we estimate the cluster age to be 1.6+0.1–0.1Gyr, and derive a reddening E(B-V)=0.23±0.05, and an apparent distance modulus (m-M)V=12.80±0.15. Its distance to the Galactic centre is 7.6kpc. With this distance and metallicity, NGC 4337 fits the metallicity gradient for the inner Galactic disc fairly well. The age and metallicity we measured make NGC 4337 a twin of the well-known old open cluster NGC 752. The red clumps of these two clusters bear an amazing resemblance. But the main sequence of NGC 752 is significantly more depleted in stars than that of NGC 4337. This would mean that NGC 752 is in a much more advanced dynamical stage, being on the verge of dissolving into the general Galactic field. Our results make NGC 4337 an extremely interesting object for further studies of stellar evolution in the critical turn-off mass range 1.1-1.4M.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - Hertzsprung-Russell and C-M diagrams - open clusters and associations: general - open clusters and associations: individual: NGC 4337

Simbad objects: 20

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Number of rows : 20
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 752 OpC 01 56 54 +37 47.6           ~ 608 0
2 NGC 3680 OpC 11 25 34 -43 14.4   8.40 7.6     ~ 309 0
3 2MASS J12232724-5802504 * 12 23 27.2455270440 -58 02 50.403307200   15.208 13.861   12.412 ~ 5 0
4 2MASS J12235665-5807252 * 12 23 56.6515968504 -58 07 25.255890516 16.433 15.253 13.933   12.568 ~ 8 0
5 2MASS J12240092-5805512 * 12 24 00.9322001112 -58 05 51.280634796 16.377 15.186 13.856   12.484 ~ 4 0
6 NGC 4337 OpC 12 24 05 -58 07.5   9.44 8.9     ~ 43 0
7 2MASS J12241575-5808502 * 12 24 15.7562511072 -58 08 50.226971064 16.180 15.079 13.804   12.493 ~ 9 0
8 2MASS J12243926-5807496 * 12 24 39.2639585040 -58 07 49.636504092 16.334 15.135 13.827   12.423 ~ 7 0
9 2MASS J12243953-5813202 * 12 24 39.5255620368 -58 13 20.167306788 16.411 15.157 13.853   12.447 ~ 6 0
10 2MASS J12244493-5802097 * 12 24 44.9302038600 -58 02 09.796391628 16.543 15.388 14.056   12.620 ~ 6 0
11 Cl Trumpler 20 OpC 12 39 32 -60 38.2           ~ 100 0
12 NGC 4815 OpC 12 58 00 -64 57.6   9.61 8.6     ~ 91 0
13 NGC 6192 OpC 16 40 18 -43 21.3           ~ 84 0
14 NGC 6253 OpC 16 59 07 -52 42.7     10.2     ~ 175 0
15 IC 4651 OpC 17 24 51 -49 55.0           ~ 339 0
16 NGC 6404 OpC 17 39 40 -33 13.4     10.6     ~ 43 0
17 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13453 0
18 NGC 6503 LIN 17 49 26.4207792072 +70 08 39.604132176 11.56 10.95 10.28 9.92   ~ 497 1
19 NGC 6583 OpC 18 15 51 -22 08.6     10.0     ~ 66 0
20 NGC 6705 OpC 18 51 04 -06 16.3   6.32 5.8     ~ 398 0

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2023.02.06-07:41:44

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