The nature of open star clusters in the Galaxy

V. A. Marsakov   ; M. L. Gozha

Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2013), pp. 92-106

Résumé

Based on our compiled catalogue of fundamental astrophysical parameters for 593 open clusters, we analyze the relations between the chemical composition, spatial positions, Galactic orbital elements, and age of open star clusters. Distinctions of the chemical and kinematical properties of the open clusters and field thin-disk stars are shown. We provide evidence for the heterogeneity of the population of open star clusters, which demonstrates the diversity of reasons of their birth, including under the influence of extragalactic objects.

Détail

Keywords: open star clusters, field Cepheids, chemical composition, kinematics, the Galaxy (the Milky Way).

Bibliographie

[1] Vande Putte D., Garnier T. P., Ferreras I., Mignani R. P., Cropper M., “A kinematic study of open clusters: implications for their origin”, Mon. Not. R. Astron. Soc., 407 (2010), 2109–2121 | DOI

[2] Dias W. S., Alessi B. S., Mointinho A., Lépine J. R. D., “New catalogue of optically visible open clusters and candidates”, Astron. Astrophys., 389 (2002), 871–873 | DOI

[3] Wu Z.-Yu., Zhou X., Ma J., Du C.-H., “The orbits of open clusters in the Galaxy”, Mon. Not. R. Astron. Soc., 399 (2009), 2146–2164 | DOI

[4] Magrini L., Randich S., Zoccali M., Jilkova L., Carraro G., Galli D., Maiorca E., Busso M., “Open clusters towards the Galactic centre: chemistry and dynamics. A VLT spectroscopic study of NGC 6192, NGC 6404, NGC 6583”, Astron. Astrophys., 523 (2010), A11 | DOI

[5] Kharchenko N. V., Piskunov A. E., Roser S., Schilbach E., Scholz R.-D., “Astrophysical parameters of Galactic open clusters”, Astron. Astrophys., 438 (2005), 1163–1173 | DOI

[6] Paunzen E., Heiter U., Netopil M., Soubiran C., “On the metallicity of open clusters. I: Photometry”, Astron. Astrophys., 517 (2010), A32 | DOI

[7] Chiappini C., Matteucci F., Gratton R. G., “The chemical evolution of the Galaxy: the two-infall model”, Astrophys. J., 477 (1997), 765–780 | DOI

[8] Marsakov V. A., Koval' V.V., Borkova T. V., Shapovalov M. V., “The age-metallicity relation in the thin disk of the galaxy”, Astronomy Reports, 55 (2011), 667–682 | DOI

[9] Koval' V. V., Marsakov V. A., Borkova T. V., “Evolution of the velocity ellipsoids in the thin disk of the Galaxy and the radial migration of stars”, Astronomy Reports, 53 (2009), 1117–1126 | DOI

[10] Marsakov V. A., Shevelev Iu. G., Suchkov A. A., “F stars: Evidence for “two-dimensional” age-metallicity relation and a new light on the enrichment history of the solar neighbourhood”, Astrophys. Space Sci., 172 (1990), 51–75 | DOI

[11] Holmberg J., Nordström B., Andersen J., “The Geneva–Copenhagen survey of the solar neighbourhood. III: Improved distances, ages, and kinematics”, Astron. Astrophys., 501 (2009), 941–947 | DOI

[12] Marsakov V. A., Borkova T. V., “Formation of Galactic subsystems in light of the magnesium abundance in field stars: the thick disk”, Astronomy Letters, 31 (2005), 515–527 | DOI

[13] Borkova T. V., Marsakov V. A., “A compiled catalog of spectroscopically determined elemental abundances for stars with accurate parallaxes; magnesium”, Astronomy Reports, 49 (2005), 405–416 | DOI

[14] Magrini L., Sestito P., Randich S., Galli D., “The evolution of the Galactic metallicity gradient from high-resolution spectroscopy of open clusters”, Astron. Astrophys., 494 (2009), 95–108 | DOI

[15] Yong D., Carney B. W., Teixera de Almeida M. L., “Elemental abundance ratios in stars of the outer galactic disk. I: Open clusters”, Astron. J., 130 (2005), 597–625 | DOI

[16] Marsakov V. A., Borkova T. V., “Formation of galactic subsystems in light of the magnesium abundance in field stars: The thin disk”, Astronomy Letters, 32 (2006), 376–392 | DOI

[17] Marsakov V. A., Borkova T. V., “Formation of galactic subsystems in light of the magnesium abundance in field stars: The halo”, Astronomy Letters, 32 (2006), 545–556

[18] Lépine J. R. D., Cruz P., Scarano S. Jr., Barros D. A., Dias W. S., Pompéia L., Andrievsky S. M., Carraro G., Famaey B., “Overlapping abundance gradients and azimuthal gradients related to the spiral structure of the Galaxy”, Mon. Not. R. Astron. Soc., 417 (2011), 698–708 | DOI

[19] Gozha M. L., Borkova T. V., Marsakov V. A., “Heterogeneity of the population of open star clusters in the Galaxy”, Astronomy Letters, 38 (2012), 506–518 | DOI

[20] Gozha M. L., Koval' V. V., Marsakov V. A., “Two populations of open star clusters in the Galaxy”, Astronomy Letters, 38 (2012), 519–530 | DOI