2010A&A...514A..81P


Query : 2010A&A...514A..81P

2010A&A...514A..81P - Astronomy and Astrophysics, volume 514, A81-81 (2010/5-1)

A statistical method to determine open cluster metallicities.

POEHNL H. and PAUNZEN E.

Abstract (from CDS):

The study of open cluster metallicities helps to understand the local stellar formation and evolution throughout the Milky Way. Its metallicity gradient is an important tracer for the Galactic formation in a global sense. Because open clusters can be treated in a statistical way, the error of the cluster mean is minimized. Our final goal is a semi-automatic statistical robust method to estimate the metallicity of a statistically significant number of open clusters based on Johnson BV data of their members, an algorithm that can easily be extended to other photometric systems for a systematic investigation. This method incorporates evolutionary grids for different metallicities and a calibration of the effective temperature and luminosity. With cluster parameters (age, reddening and distance) it is possible to estimate the metallicity from a statistical point of view. The iterative process includes an intrinsic consistency check of the starting input parameters and allows us to modify them. We extensively tested the method with published data for the Hyades. We selected sixteen open clusters within 1000pc around the Sun with available and reliable Johnson BV measurements. In addition, Berkeley 29, with a distance of about 15kpc was chosen. For several targets we are able to compare our result with published ones which yielded a very good coincidence (including Berkeley 29). A new method for the statistical determination of open cluster metallicities is presented and tested. It is quite robust against errors in effective temperature and luminosity calibration of the individual stars.

Abstract Copyright:

Journal keyword(s): Hertzsprung-Russell (HR) and C-M diagrams - stars: abundances - stars: evolution - stars: distances

Simbad objects: 19

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Number of rows : 19
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 752 OpC 01 56 54 +37 47.6           ~ 584 0
2 Cl Stock 2 OpC 02 15 25 +59 31.3           ~ 105 0
3 NGC 1039 OpC 02 42 07 +42 43.3           ~ 395 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6276 1
5 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 795 0
6 Cl Alessi 13 OpC 03 27 03 -35 49.3           ~ 56 0
7 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2843 0
8 NGC 2168 OpC 06 09 05 +24 20.2           ~ 505 0
9 Cl Berkeley 29 OpC 06 53 04.2 +16 55 39   14.3       ~ 153 0
10 NGC 2451A OpC 07 42 57 -38 15.8           ~ 100 0
11 NGC 2451B OpC 07 44 31 -37 57.2           ~ 77 0
12 NGC 2451 Cl* 07 45.4 -37 58           ~ 155 1
13 NGC 2516 OpC 07 58 06 -60 48.0           ~ 645 0
14 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 356 0
15 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1384 0
16 Cl Melotte 111 OpC 12 24 03 +25 39.1           ~ 438 0
17 IC 4665 OpC 17 46 13 +05 36.9           ~ 337 0
18 NGC 6475 OpC 17 53 47 -34 50.5           ~ 355 0
19 NGC 7092 OpC 21 31 33 +48 14.8           ~ 202 0

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2022.05.20-15:41:33

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