| dc.creator | Piatti, Andrés E. | |
| dc.creator | Perren, Gabriel Ignacio | |
| dc.date | 2015 | |
| dc.date | 2019-11-25T14:35:32Z | |
| dc.date.accessioned | 2023-07-14T17:34:35Z | |
| dc.date.available | 2023-07-14T17:34:35Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/86048 | |
| dc.identifier | issn:0035-8711 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/7428014 | |
| dc.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. | |
| dc.description | Facultad de Ciencias Astronómicas y Geofísicas | |
| dc.format | application/pdf | |
| dc.format | 3771-3777 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Ciencias Astronómicas | |
| dc.subject | Techniques: photometric | |
| dc.title | New age-metallicity diagnostic diagram for the Washington photometric system | |
| dc.type | Articulo | |
| dc.type | Articulo | |
