IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
The Galactic open cluster system: evidence of enhanced formation episodes
Autor/es:
PIATTI, ANDRÉS; E.
Revista:
bol. asoc. arg. astron.
Editorial:
Claria,J.J., Alonso, V., Piatti, A.E.
Referencias:
Año: 2011 vol. 53 p. 137 - 140
ISSN:
0571–3285
Resumen:
The exciting debate about the existence of signs of enhanced formation of Galactic open clusters (OCs) is revisited here on the basis of a revised age distribution. By using the recently updated 2009 version of the Dias et al. catalogue of 1787 OCs, we found that the present OC´s age distribution presents two primary  excesses at $t$ $sim$ 10-15 Myr and 1.5 Gyr. We interpret both excesses as signs of enhanced formation episodes similar  to those that occurred in other galaxies (e.g., M,51, NGC,1705).  When restricting the OC sample to those located in the solar neighbourhood,  with the aim of avoiding incompleteness  effects,  we also find  that these clusters are engraved with clear signs of enhanced formation at both ages.