Gaia Galactic open clusters located within 1kpc

Furthermore, we characterize the stellar parameters with the PARSEC isochrones. We obtain reliable star members for 370 open clusters with an average parallax error of {sigma}{pi}=0.16mas. We identify about ~40% more stars in these clusters compared to previous work using the Gaia DR2 catalogue, including faint stars as new members with G>=17.

Before the clustering application we correct the parallax zero-point bias to avoid spatial distribution stretching that may affect clustering results. Our membership lists include merging stars identified by HDBSCAN with astrometry and photometry. We note that the use of photometry in clustering can recover up to 10% more stars in the fainter limit than clustering based on astrometry only, this combined with the selection of stars filtering them out by quality cuts significantly reduces the number of stars with huge {sigma}{pi}.

After clustering, we estimate age, Z, and AV from the photometry of the membership lists. We have carried out a search to extent the membership list for 370 open clusters mainly on the Galactic plane in a neighborhood of 1kpc. Our methodology provides a robust estimator for outliers identification and also extends the membership lists to fainter stars in most of the clusters.

Our findings suggest the need to carefully identify spurious sources that may affect clustering results.