New age-metallicity diagnostic diagram for the Washington photometric system
The age calibration of the Washington δT<SUB>1</SUB> index is mainly used to estimate ages of star clusters older than 1 Gyr and no age-metallicity degeneracy effect is considered. We have profusely exploited synthetic T<SUB>1</SUB> versus C - T<SUB>1</SUB> colour...
| Autores principales: | , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2015
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/86048 |
| Aporte de: |
| id |
I19-R120-10915-86048 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Techniques: photometric |
| spellingShingle |
Ciencias Astronómicas Techniques: photometric Piatti, Andrés E. Perren, Gabriel Ignacio New age-metallicity diagnostic diagram for the Washington photometric system |
| topic_facet |
Ciencias Astronómicas Techniques: photometric |
| description |
The age calibration of the Washington δT<SUB>1</SUB> index is mainly used to estimate ages of star clusters older than 1 Gyr and no age-metallicity degeneracy effect is considered. We have profusely exploited synthetic T<SUB>1</SUB> versus C - T<SUB>1</SUB> colour magnitude diagrams to explore the intrinsic behaviour of the δT<SUB>1</SUB> index. The analysis shows that δT<SUB>1</SUB> varies with age and metal content as well. In general, the dependence on age weakens for ages greater than ~6 Gyr, and is even less sensitive to age as the metallicity decreases. For ages younger than ~5 Gyr, δT<SUB>1</SUB> shows a strong correlation with both age and metallicity. The δC index - defined as δT<SUB>1</SUB> for the C passband - is also a combined measurement of age and metallicity. We introduce a new age-metallicity diagnostic diagram, δT<SUB>1</SUB> versus δC - δT<SUB>1</SUB>, which can unambiguously provide age and metallicity estimates, simultaneously. The new procedure can be used to derive ages from 1 up to 13 Gyr and metallicities [Fe/H] from -2.0 up to +0.5 dex, and is independent of the cluster reddening and distance modulus. It solves the constraints found in the δT<SUB>1</SUB> index and surpasses the performance of the standard giant branch metallicity method. All these features make the diagnostic diagram a powerful tool for estimating accurate ages as well as metallicities. |
| format |
Articulo Articulo |
| author |
Piatti, Andrés E. Perren, Gabriel Ignacio |
| author_facet |
Piatti, Andrés E. Perren, Gabriel Ignacio |
| author_sort |
Piatti, Andrés E. |
| title |
New age-metallicity diagnostic diagram for the Washington photometric system |
| title_short |
New age-metallicity diagnostic diagram for the Washington photometric system |
| title_full |
New age-metallicity diagnostic diagram for the Washington photometric system |
| title_fullStr |
New age-metallicity diagnostic diagram for the Washington photometric system |
| title_full_unstemmed |
New age-metallicity diagnostic diagram for the Washington photometric system |
| title_sort |
new age-metallicity diagnostic diagram for the washington photometric system |
| publishDate |
2015 |
| url |
http://sedici.unlp.edu.ar/handle/10915/86048 |
| work_keys_str_mv |
AT piattiandrese newagemetallicitydiagnosticdiagramforthewashingtonphotometricsystem AT perrengabrielignacio newagemetallicitydiagnosticdiagramforthewashingtonphotometricsystem |
| bdutipo_str |
Repositorios |
| _version_ |
1764820489245556737 |