Open clusters in Gaia era

The goal of my work is to address the topic of the formation and evolution of the Galactic disk through the properties of open clusters. During my PhD I use photometric and astrometric data to derive open clusters properties such as distance, age, proper motions and metallicity. The aim is to take advantage of the high quality astrometry and photometry of first Gaia data release to build a homogeneous data base and to improve the cluster census. This is the first step towards Gaia second data release exploitation. To analyze large samples of data I develop and validate an automated pipeline. This includes: 1) BASE-9, a free available automated Bayesian analysis tool for parameters determination of stellar clusters, and the automated procedure UPMASK (free available). This procedure uses Principal Component Analysis and k-means clustering to select stars having similar properties on the photometric planes to determine the membership probability. In this work I improve it to deal also with astrometric data. I also improve BASE-9 in order to work with PARSEC isochrones I make use of ESO archive data to analyse the photometry and derive the physical parameters of three clusters namely NGC 2225, NGC 6134 and NGC 2243. I re-analyzed them with BASE-9 to compare the two methods. I used the Gaia first data release parallaxes and proper motions (TGAS), complemented with UCAC4 data, to study a sample of 134 OCs, and the data of the Hot Stuff for One Years catalog to study a sample of 13 OCs. I derived candidate members, proper motions and parallaxes for a sample of about 150 OCs. Using BASE-9 I inferred age, distance and extinction for 39 OCs and metallicity for 34 OCs. Finally, using the Python library galpy, I calculated the orbit of 36 OCs. I find evidences of vertical heating already effective at the time defined by the age of our clusters (~ 1Gyr). No evident sign of radial heating is detected in the same timescale.