A comprehensive study of 94 open clusters based on the data from IPHAS, GAIA DR2, and other sky surveys

Abstract

We determine the color excesses, photometric distances, ages, astrometric parallaxes and proper motions for 94 open clusters in the northern part of the Milky Way. We estimate the color excesses and photometric distances based on the data from IPHAS photometric survey of the northern Galactic plane using individual total-to-selective extinction ratios R_r=A_r/E_(r-i) for each cluster computed via the color-difference method based on IPHAS r, i, and H_alpha-band, 2MASS J, H, and K_s-band, WISE W1-band, and Pan-STARRS i, z, and y-band data. The inferred R_r values vary significantly from cluster to cluster spanning the R_r=3.1--5.2 interval with a mean and standard deviation equal to <R_r>=3.99 and sigma R_r=0.34, respectively. We identified cluster members using (1) absolute proper motions determined from individual-epoch positions of stars retrieved from IPHAS, 2MASS, URAT1, ALLWISE, UCAC5, and Gaia DR1 catalogs and positions of stars on individual Palomar Sky Survey plates reconstructed based on the data provided in USNO-B1.0 catalog and (2) absolute proper motions provided in Gaia DR2 catalog, and computed the average Gaia DR2 trigonometric parallaxes and proper motions of the clusters. The mean formal error of the inferred astrometric parallaxes of clusters is of about 7microarcseconds, however, a comparison of astrometric and photometric parallaxes of our cluster sample implies that Gaia DR2 parallaxes are, on the average, systematically underestimated by 45 +/-9 microarcseconds. This result agrees with estimates obtained by other authors using other objects. At the same time, we find our photometric distance scale to be correct within the quoted errors (the inferred correction factor is equal to unity to within a standard error of 0.025).

8 pages, 8 figures, 2 tables, accepted for Astrophysical Bulletin

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• Kinematics of the Galaxy from a Sample of Young Open Star Clusters with Data from the Gaia DR2 Catalogue
• A new look at Sco OB1 association with Gaia DR2
• Influence of the Galactic bar on the kinematics of the disc stars with Gaia EDR3 data
• Galactic Rotation Based on OB Stars from the Gaia DR2 Catalogue
• Search for the evolutionary relationship between Galactic globular and open clusters using data from the Gaia DR2 Catalog
• A revision of the vdB 130 cluster stellar content based on GAIA DR2 Data. Interstellar extinction toward the Cyg OB1 supershell
• Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue
• Kinematics of Hot Subdwarfs from the Gaia DR2 Catalogue
• Features of the Residual Velocity Ellipsoid of Hot Subdwarfs from the Gaia DR2 Catalog
• Validation of the Gaia Early Data Release 3 parallax zero-point model with asteroseismology