On the metallicity of open clusters II. Spectroscopy

J 2014

On the metallicity of open clusters II. Spectroscopy

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

Základní údaje

Originální název

On the metallicity of open clusters II. Spectroscopy

Autoři

HEITER, Ulrike (752 Švédsko), Caroline SOUBIRAN (250 Francie), Martin NETOPIL (40 Rakousko, garant) a Ernst PAUNZEN (40 Rakousko, domácí)

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2014, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 4.378

Kód RIV

RIV/00216224:14310/14:00075132

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/201322559

UT WoS

000330584000093

Klíčová slova anglicky

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

Štítky

AKR, rivok

Změněno: 10. 4. 2015 14:05, Ing. Andrea Mikešková

Anotace

V originále

Context. Open clusters are an important tool for studying the chemical evolution of the Galactic disk. Metallicity estimates are available for about ten percent of the currently known open clusters. These metallicities are based on widely differing methods, however, which introduces unknown systematic effects. Aims. In a series of three papers, we investigate the current status of published metallicities for open clusters that were derived from a variety of photometric and spectroscopic methods. The current article focuses on spectroscopic methods. The aim is to compile a comprehensive set of clusters with the most reliable metallicities from high-resolution spectroscopic studies. This set of metallicities will be the basis for a calibration of metallicities from different methods. Methods. The literature was searched for [Fe/H] estimates of individual member stars of open clusters based on the analysis of high-resolution spectra. For comparison, we also compiled [Fe/H] estimates based on spectra with low and intermediate resolution. At medium and high resolution, we found that differences in the analysis methods have a stronger effect on the metallicity than that of quality differences in the observations. We retained only highly probable cluster members and introduced a restriction on atmospheric parameters. Results. We combined 641 individual metallicity values for 458 stars in 78 open clusters from 86 publications to form our final set of high-quality cluster metallicities. The photometric metallicities discussed in the first paper of this series are systematically lower than the spectroscopic ones by about 0.1 dex, and the differences show a scatter of about 0.2 dex. In a preliminary comparison of our spectroscopic sample with models of Galactic chemical evolution, none of the models predicts the observed radial metallicity gradient. Conclusions. Photometric metallicities show a large intrinsic dispersion, while the more accurate spectroscopic sample presented in this paper comprises fewer than half the number of clusters. Only a sophisticated combination of all available photometric and spectroscopic data will allow us to trace the metallicity distribution in the Galactic disk on a local and global scale.

Návaznosti

3SGA5916, interní kód MU

Název: Hvězdy a hvězdokupy v Magellanových mračnech (Akronym: Webda MaC)

Investor: Jihomoravský kraj, Hvězdy a hvězdokupy v Magellanových mračnech, Granty pro zahraniční vědce

7AMB12AT003, projekt VaV

Název: Proměnné hvězdy v otevřených hvězdokupách (Akronym: VSOC)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Proměnné hvězdy v otevřených hvězdokupách

Citovat

HEITER, Ulrike, Caroline SOUBIRAN, Martin NETOPIL a Ernst PAUNZEN. On the metallicity of open clusters II. Spectroscopy. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2014, roč. 561, JANUARY, s. 1-22. ISSN 0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201322559.

@article{1168572,
   author = {Heiter, Ulrike and Soubiran, Caroline and Netopil, Martin and Paunzen, Ernst},
   article_location = {LES ULIS CEDEX A},
   article_number = {JANUARY},
   doi = {http://dx.doi.org/10.1051/0004-6361/201322559},
   keywords = {Galaxy: abundances; open clusters and associations: general; stars: abundances},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {On the metallicity of open clusters II. Spectroscopy},
   volume = {561},
   year = {2014}
}

TY  - JOUR
ID  - 1168572
AU  - Heiter, Ulrike - Soubiran, Caroline - Netopil, Martin - Paunzen, Ernst
PY  - 2014
TI  - On the metallicity of open clusters II. Spectroscopy
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 561
IS  - JANUARY
SP  - 1-22
EP  - 1-22
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - Galaxy: abundances
KW  - open clusters and associations: general
KW  - stars: abundances
N2  - Context. Open clusters are an important tool for studying the chemical evolution of the Galactic disk. Metallicity estimates are available for about ten percent of the currently known open clusters. These metallicities are based on widely differing methods, however, which introduces unknown systematic effects. Aims. In a series of three papers, we investigate the current status of published metallicities for open clusters that were derived from a variety of photometric and spectroscopic methods. The current article focuses on spectroscopic methods. The aim is to compile a comprehensive set of clusters with the most reliable metallicities from high-resolution spectroscopic studies. This set of metallicities will be the basis for a calibration of metallicities from different methods. Methods. The literature was searched for [Fe/H] estimates of individual member stars of open clusters based on the analysis of high-resolution spectra. For comparison, we also compiled [Fe/H] estimates based on spectra with low and intermediate resolution. At medium and high resolution, we found that differences in the analysis methods have a stronger effect on the metallicity than that of quality differences in the observations. We retained only highly probable cluster members and introduced a restriction on atmospheric parameters. Results. We combined 641 individual metallicity values for 458 stars in 78 open clusters from 86 publications to form our final set of high-quality cluster metallicities. The photometric metallicities discussed in the first paper of this series are systematically lower than the spectroscopic ones by about 0.1 dex, and the differences show a scatter of about 0.2 dex. In a preliminary comparison of our spectroscopic sample with models of Galactic chemical evolution, none of the models predicts the observed radial metallicity gradient. Conclusions. Photometric metallicities show a large intrinsic dispersion, while the more accurate spectroscopic sample presented in this paper comprises fewer than half the number of clusters. Only a sophisticated combination of all available photometric and spectroscopic data will allow us to trace the metallicity distribution in the Galactic disk on a local and global scale.
ER  -

HEITER, Ulrike, Caroline SOUBIRAN, Martin NETOPIL a Ernst PAUNZEN. On the metallicity of open clusters II. Spectroscopy. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2014, roč.~561, JANUARY, s.~1-22. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201322559.

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