Towards a photometric metallicity scale for open clusters

J 2013

Towards a photometric metallicity scale for open clusters

NETOPIL, Martin a Ernst PAUNZEN

Základní údaje

Originální název

Towards a photometric metallicity scale for open clusters

Autoři

NETOPIL, Martin a Ernst PAUNZEN

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2013, 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: 4.479

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/13:00066487

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1051/0004-6361/201321829

UT WoS

000325211900117

Klíčová slova anglicky

Hertzsprung-Russell and C-M diagrams; open clusters and associations: general; Galaxy: abundances; stars: abundances; stars: evolution

Štítky

AKR, rivok

Změněno: 10. 4. 2014 15:41, Ing. Andrea Mikešková

Anotace

V originále

Context. Open clusters are a useful tool when investigating several topics connected with stellar evolution; for example the age or distance can be more accurately determined than for field stars. However, one important parameter, the metallicity, is only known for a marginal percentage of open clusters. Aims. We aim at a consistent set of parameters for the open clusters investigated in our photometric Delta a survey of chemically peculiar stars. Special attention is paid to expanding our knowledge of cluster metallicities and verifying their scale. Methods. Making use of a previously developed method based on normalised evolutionary grids and photometric data, the distance, age, reddening, and metallicity of open clusters were derived. To transform photometric measurements into effective temperatures to use as input for our method, a set of temperature calibrations for the most commonly used colour indices and photometric systems was compiled. Results. We analysed 58 open clusters in total. Our derived metallicity values were in excellent agreement with about 30 spectroscopically studied targets. The mean value of the absolute deviations was found to be 0.03 dex, with no noticeable offset or gradient. The method was also applied using recent evolutionary models based on the currently accepted lower solar abundance value Z similar to 0.014. No significant differences were found compared to grids using the former adopted solar value Z = 0.02. Furthermore, some divergent photometric datasets were identified and discussed. Conclusions. The method provides an accurate way of obtaining properly scaled metallicity values for open clusters. In light of present and future homogeneous photometric sky surveys, the sample of stellar clusters can be extended to the outskirts of the Milky Way, where spectroscopic studies are almost impossible. This will help for determining galactic metallicity gradients in more detail.

Návaznosti

GAP209/12/0217, projekt VaV

Název: Multispektrální proměnnost horkých hvězd a její příčiny

Investor: Grantová agentura ČR, Multispektrální proměnnost horkých hvězd a její příčiny

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

NETOPIL, Martin a Ernst PAUNZEN. Towards a photometric metallicity scale for open clusters. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2013, roč. 557, č. 9, s. A10, 19 s. ISSN 0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201321829.

@article{1129081,
   author = {Netopil, Martin and Paunzen, Ernst},
   article_location = {LES ULIS CEDEX A},
   article_number = {9},
   doi = {https://doi.org/10.1051/0004-6361/201321829},
   keywords = {Hertzsprung-Russell and C-M diagrams; open clusters and associations: general; Galaxy: abundances; stars: abundances; stars: evolution},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Towards a photometric metallicity scale for open clusters},
   volume = {557},
   year = {2013}
}

TY  - JOUR
ID  - 1129081
AU  - Netopil, Martin - Paunzen, Ernst
PY  - 2013
TI  - Towards a photometric metallicity scale for open clusters
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 557
IS  - 9
SP  - A10
EP  - A10
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - Hertzsprung-Russell and C-M diagrams
KW  - open clusters and associations: general
KW  - Galaxy: abundances
KW  - stars: abundances
KW  - stars: evolution
N2  - Context. Open clusters are a useful tool when investigating several topics connected with stellar evolution; for example the age or distance can be more accurately determined than for field stars. However, one important parameter, the metallicity, is only known for a marginal percentage of open clusters. Aims. We aim at a consistent set of parameters for the open clusters investigated in our photometric Delta a survey of chemically peculiar stars. Special attention is paid to expanding our knowledge of cluster metallicities and verifying their scale. Methods. Making use of a previously developed method based on normalised evolutionary grids and photometric data, the distance, age, reddening, and metallicity of open clusters were derived. To transform photometric measurements into effective temperatures to use as input for our method, a set of temperature calibrations for the most commonly used colour indices and photometric systems was compiled. Results. We analysed 58 open clusters in total. Our derived metallicity values were in excellent agreement with about 30 spectroscopically studied targets. The mean value of the absolute deviations was found to be 0.03 dex, with no noticeable offset or gradient. The method was also applied using recent evolutionary models based on the currently accepted lower solar abundance value Z similar to 0.014. No significant differences were found compared to grids using the former adopted solar value Z = 0.02. Furthermore, some divergent photometric datasets were identified and discussed. Conclusions. The method provides an accurate way of obtaining properly scaled metallicity values for open clusters. In light of present and future homogeneous photometric sky surveys, the sample of stellar clusters can be extended to the outskirts of the Milky Way, where spectroscopic studies are almost impossible. This will help for determining galactic metallicity gradients in more detail.
ER  -

NETOPIL, Martin a Ernst PAUNZEN. Towards a photometric metallicity scale for open clusters. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2013, roč.~557, č.~9, s.~A10, 19 s. ISSN~0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201321829.

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