NGC 2660: Gaia DR2, ASteCA and the end of controversies?
NGC 2660, an old and very compact open cluster placed at about 3 kpc from the Sun in a region of moderate absorption, has been subject of several photometric and spectroscopic studies in the past. Controversies arise in terms of its distance, age and metal content. Previous comparisons with cluster...
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2021
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/166336 |
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I19-R120-10915-1663362024-10-17T16:16:43Z http://sedici.unlp.edu.ar/handle/10915/166336 NGC 2660: Gaia DR2, ASteCA and the end of controversies? Giorgi, Edgard Ervar Salvador Perren, Gabriel Ignacio De Laurenti, M. A. Solivella, Gladys Rebeca Pera, María Sol Cruzado, Alicia Vázquez, Rubén Ángel 2021 2024-05-23T13:30:00Z en Ciencias Astronómicas open clusters and associations: individual (NGC 2660) NGC 2660, an old and very compact open cluster placed at about 3 kpc from the Sun in a region of moderate absorption, has been subject of several photometric and spectroscopic studies in the past. Controversies arise in terms of its distance, age and metal content. Previous comparisons with cluster synthetic models carried out did not resolve them. We decided to analyze this object combining high precision parallax, proper motions and magnitudes coming from the Gaia Second Data release (Gaia DR2), in order to improve the cluster fundamental parameters. So we collect Gaia DR2 data in a 1 square degree region, centered in NGC 2660. For the membership estimation, we run the pyUPMASK code and completed the overall cluster analysis with the ASteCA code. The cluster main sequence shows a well-defined turn-off point although some stars are placed above it, resembling the typical position of blue straggler stars. There is an evident widening of the main sequence hard to be explained by just photometric errors becoming more probable that it is produced by a high percentage of binary stars. NGC 2660, un cúmulo abierto viejo y muy compacto localizado a aproximadamente 3 kpc del Sol en una región de absorción moderada, ha sido objeto de varios estudios fotométricos y espectroscópicos en el pasado. Surgen controversias en cuanto a su distancia, antigüedad y contenido metálico. Las comparaciones llevadas a cabo por investigaciones anteriores con modelos sintéticos de cúmulos no las resolvieron. Decidimos analizar este objeto combinando paralaje de alta precisión, movimientos propios y magnitudes procedentes del Gaia Second Data Release (Gaia DR2) para mejorar los parámetros fundamentales del cúmulo. Para ello seleccionamos los datos de Gaia DR2 en una región de 1 grado de lado centrada en NGC 2660. Para la identificación de miembros utilizamos el código pyUPMASK y completamos el análisis general del cúmulo con el código ASteCA. La secuencia principal del cúmulo muestra un turn-off point bien definido, aunque algunas estrellas se ubican por encima de él, en la posición típica de las estrellas blue stragglers. Hay un evidente ensanchamiento de la secuencia principal, que es difícil de atribuir solo a errores fotométricos, siendo más probable que ella se deba a un alto porcentaje de estrellas binarias. Asociación Argentina de Astronomía Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 77-79 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas open clusters and associations: individual (NGC 2660) |
| spellingShingle |
Ciencias Astronómicas open clusters and associations: individual (NGC 2660) Giorgi, Edgard Ervar Salvador Perren, Gabriel Ignacio De Laurenti, M. A. Solivella, Gladys Rebeca Pera, María Sol Cruzado, Alicia Vázquez, Rubén Ángel NGC 2660: Gaia DR2, ASteCA and the end of controversies? |
| topic_facet |
Ciencias Astronómicas open clusters and associations: individual (NGC 2660) |
| description |
NGC 2660, an old and very compact open cluster placed at about 3 kpc from the Sun in a region of moderate absorption, has been subject of several photometric and spectroscopic studies in the past. Controversies arise in terms of its distance, age and metal content. Previous comparisons with cluster synthetic models carried out did not resolve them. We decided to analyze this object combining high precision parallax, proper motions and magnitudes coming from the Gaia Second Data release (Gaia DR2), in order to improve the cluster fundamental parameters. So we collect Gaia DR2 data in a 1 square degree region, centered in NGC 2660. For the membership estimation, we run the pyUPMASK code and completed the overall cluster analysis with the ASteCA code. The cluster main sequence shows a well-defined turn-off point although some stars are placed above it, resembling the typical position of blue straggler stars. There is an evident widening of the main sequence hard to be explained by just photometric errors becoming more probable that it is produced by a high percentage of binary stars. |
| format |
Articulo Articulo |
| author |
Giorgi, Edgard Ervar Salvador Perren, Gabriel Ignacio De Laurenti, M. A. Solivella, Gladys Rebeca Pera, María Sol Cruzado, Alicia Vázquez, Rubén Ángel |
| author_facet |
Giorgi, Edgard Ervar Salvador Perren, Gabriel Ignacio De Laurenti, M. A. Solivella, Gladys Rebeca Pera, María Sol Cruzado, Alicia Vázquez, Rubén Ángel |
| author_sort |
Giorgi, Edgard Ervar Salvador |
| title |
NGC 2660: Gaia DR2, ASteCA and the end of controversies? |
| title_short |
NGC 2660: Gaia DR2, ASteCA and the end of controversies? |
| title_full |
NGC 2660: Gaia DR2, ASteCA and the end of controversies? |
| title_fullStr |
NGC 2660: Gaia DR2, ASteCA and the end of controversies? |
| title_full_unstemmed |
NGC 2660: Gaia DR2, ASteCA and the end of controversies? |
| title_sort |
ngc 2660: gaia dr2, asteca and the end of controversies? |
| publishDate |
2021 |
| url |
http://sedici.unlp.edu.ar/handle/10915/166336 |
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