J 2016

On the metallicity of open clusters. III. Homogenised sample

NETOPIL, Martin, Ernst PAUNZEN, Ulrike HEITER and Caroline SOUBIRAN

Basic information

Original name

On the metallicity of open clusters. III. Homogenised sample

Authors

NETOPIL, Martin (40 Austria, guarantor, belonging to the institution), Ernst PAUNZEN (40 Austria, belonging to the institution), Ulrike HEITER (752 Sweden) and Caroline SOUBIRAN (250 France)

Edition

Astronomy and Astrophysics, 2016, 1432-0746

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 5.014

RIV identification code

RIV/00216224:14310/16:00087846

Organization unit

Faculty of Science

DOI

UT WoS

000369710300157

Keywords in English

Galaxy: abundances; Galaxy: structure; open clusters and associations :general

Tags

Změněno: 9/4/2017 10:07, Ing. Andrea Mikešková

Abstract

V originále

Open clusters are known as excellent tools for various topics in Galactic research. For example, they allow accurately tracing the chemical structure of the Galactic disc. However, the metallicity is known only for a rather low percentage of the open cluster population, and these values are based on a variety of methods and data. Therefore, a large and homogeneous sample is highly desirable. In the third part of our series we compile a large sample of homogenised open cluster metallicities using a wide variety of different sources. These data and a sample of Cepheids are used to investigate the radial metallicity gradient, age effects, and to test current models. We used photometric and spectroscopic data to derive cluster metallicities. The different sources were checked and tested for possible offsets and correlations. In total, metallicities for 172 open cluster were derived. We used the spectroscopic data of 100 objects for a study of the radial metallicity distribution and the age-metallicity relation. We found a possible increase of metallicity with age, which, if confirmed, would provide observational evidence for radial migration. Although a statistical significance is given, more studies are certainly needed to exclude selection effects, for example. The comparison of open clusters and Cepheids with recent Galactic models agrees well in general. However, the models do not reproduce the flat gradient of the open clusters in the outer disc. Thus, the effect of radial migration is either underestimated in the models, or an additional mechanism is at work. Apart from the Cepheids, open clusters are the best tracers for metallicity over large Galactocentric distances in the Milky Way. For a sound statistical analysis, a sufficiently large and homogeneous sample of cluster metallicities is needed. Our compilation is currently by far the largest and provides the basis for several basic studies such as the statistical treatment of the Galactic cluster population, or evolutionary studies of individual star groups in open clusters.

Links

GP14-26115P, research and development project
Name: Vstříc k jednotné škále metalicity pro otevřené hvězdokupy
Investor: Czech Science Foundation
3SGA5916, interní kód MU
Name: Hvězdy a hvězdokupy v Magellanových mračnech (Acronym: Webda MaC)
Investor: South-Moravian Region, Incoming grants
7AMB14AT015, research and development project
Name: Nový pohled na magnetické hvězdy (Acronym: MAGSTARS)
Investor: Ministry of Education, Youth and Sports of the CR