2004A&A...422..951C


Query : 2004A&A...422..951C

2004A&A...422..951C - Astronomy and Astrophysics, volume 422, 951-962 (2004/8-2)

Iron abundances from high-resolution spectroscopy of the open clusters NGC 2506, NGC 6134, and IC 4651.

CARRETTA E., BRAGAGLIA A., GRATTON R.G. and TOSI M.

Abstract (from CDS):

This is the first of a series of papers devoted to deriving the metallicity of old open clusters to study the time evolution of the chemical abundance gradient in the Galactic disk. We present detailed iron abundances from high resolution (R> 40000) spectra of several red clump and bright giant stars in the open clusters IC 4651, NGC 2506 and NGC 6134. We observed 4 stars of NGC 2506, 3 stars of NGC 6134 and 5 stars of IC 4651 with the FEROS spectrograph with the ESO 1.5 m telescope; moreover, 3 other stars of NGC 6134 were observed with the UVES spectrograph on Kueyen (VLT UT2). After excluding the cool giants near the red giant branch tip (one in IC 4651 and one in NGC 2506), we found overall [Fe/H] values of -0.20±0.01, rms=0.02dex (2 stars) for NGC 2506, +0.15±0.03, rms=0.07dex (6 stars) for NGC 6134 and +0.11±0.01, rms=0.01dex (4 stars) for IC 4651. The metal abundances derived from a line analysis for each star were extensively checked using spectrum synthesis of about 30 to 40 Fe I lines and 6 Fe II lines. Our spectroscopic temperatures provide reddening values in good agreement with literature data for these clusters, strengthening the reliability of the adopted temperature and metallicity scale. Also, gravities from the Fe equilibrium of ionization agree quite well with expectations based on cluster distance moduli and evolutionary masses.

Abstract Copyright:

Journal keyword(s): stars: abundances - Galaxy: disk - Galaxy: open clusters and associations: general - Galaxy: open clusters and associations: individual: NGC 2506, NGC 6134, IC 4651

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 2506 3359 RB? 07 59 51.9010420704 -10 48 45.212790924   14.185 13.203     ~ 12 0
2 NGC 2506 3271 * 07 59 54.1667371320 -10 46 18.479495388   14.89 14.00     ~ 13 0
3 NGC 2506 3231 RB? 07 59 55.8704447448 -10 48 21.427837056   14.08 13.1     ~ 17 0
4 NGC 2506 OpC 08 00 02 -10 46.4   8.28 7.6     ~ 242 0
5 NGC 2506 2122 RB? 08 00 05.8769494704 -10 47 13.588541196   12.86 11.7   12.10 ~ 16 0
6 NGC 6134 114 RB? 16 27 32.1024483912 -49 09 01.994623956   13.387 12.077     ~ 14 0
7 NGC 6134 69 * 16 27 39.4976297064 -49 08 39.363556704     12.39     ~ 11 0
8 NGC 6134 157 RB? 16 27 40.0600252536 -49 12 42.251818824   13.54 12.272     ~ 13 0
9 NGC 6134 75 RB? 16 27 42.2754818304 -49 06 36.165240468   13.678 12.394     ~ 14 0
10 NGC 6134 129 RB? 16 27 46.0757406840 -49 05 29.618272248   13.41 12.53     ~ 17 0
11 NGC 6134 OpC 16 27 49 -49 09.7   7.89 7.2     ~ 137 0
12 NGC 6134 39 RB? 16 27 57.6898182432 -49 08 36.339291996   13.475 12.202     ~ 14 0
13 CD-49 11402 * 17 24 46.7176119264 -49 54 06.987841164   12.027 10.894     ~ 36 0
14 CD-49 11404 * 17 24 50.0710852992 -49 56 56.079791376   11.5 10.7     ~ 39 0
15 IC 4651 OpC 17 24 51 -49 55.0           ~ 329 0
16 CD-49 11415 * 17 24 54.1498716864 -49 53 07.518967440   11.76 10.44     ~ 33 0
17 CD-49 11417 * 17 25 08.9395734624 -49 53 57.123001032   10.7 8.94     K2 30 0
18 IC 4651 146 * 17 25 23.5409449896 -49 55 47.062096320   12.08 10.94     K0III 26 0

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2022.05.21-13:30:52

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