J 2015

A comparative study on the reliability of open cluster parameters

NETOPIL, Martin, Ernst PAUNZEN and Giovanni CARRARO

Basic information

Original name

A comparative study on the reliability of open cluster parameters

Authors

NETOPIL, Martin (40 Austria, guarantor, belonging to the institution), Ernst PAUNZEN (40 Austria, belonging to the institution) and Giovanni CARRARO (380 Italy)

Edition

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2015, 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

References:

Impact factor

Impact factor: 5.185

RIV identification code

RIV/00216224:14310/15:00081324

Organization unit

Faculty of Science

DOI

UT WoS

000363538500019

Keywords in English

open clusters and associations: general; Galaxy: fundamental parameters

Tags

Změněno: 23/3/2016 15:49, Ing. Andrea Mikešková

Abstract

V originále

Open clusters are known as excellent tracers of the structure and chemical evolution of the Galactic disk, however, the accuracy and reliability of open cluster parameters is poorly known. In recent years, several studies aimed to present homogeneous open cluster parameter compilations, which are based on some different approaches and photometric data. These catalogues are excellent sources to facilitate testing of the actual accuracy of open cluster parameters. We compare seven cluster parameter compilations statistically and with an external sample, which comprises the mean results of individual studies. Furthermore, we selected the objects IC 4651, NGC 2158, NGC 2383, NGC 2489, NGC 2627, NGC 6603, and Trumpler 14, with the main aim to highlight differences in the fitting solutions. We derived correction terms for each cluster parameter, using the external calibration sample. Most results by the compilations are reasonable scaled, but there are trends or constant off sets of different degree. We also identified one data set, which appears too erroneous to allow adjustments. After the correction, the mean intrinsic errors amount to about 0.2 dex for the age, 0.08 mag for the reddening, and 0.35 mag for the distance modulus. However, there is no study that characterises the cluster morphologies of all test cases in a correct and consistent manner. Furthermore, we found that the largest compilations probably include at least 20 percent of problematic objects, for which the parameters differ significantly. These could be among others doubtful or unlikely open clusters that do not facilitate an unambiguous fitting solution.

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