Towards a census of the Galactic anticentre star clusters – II. Exploring lower overdensities

Authors

  • D. Camargo,

    Corresponding author
    1. Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS, Brazil
      E-mail: denilso.camargo@ufrgs.br
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  • C. Bonatto,

    1. Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS, Brazil
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  • E. Bica

    1. Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS, Brazil
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E-mail: denilso.camargo@ufrgs.br

ABSTRACT

We investigate the nature of 48 low-level stellar overdensities (from Froebrich, Scholz and Raftery catalogue – FSR07) projected towards the Galactic anticentre and derive fundamental parameters for the confirmed clusters, thus improving the open cluster (OC) census in that direction. Parameters are derived with field-star decontaminated photometry, colour–magnitude filters and stellar radial density profiles. Among the 48 targets, we identified 18 star clusters, six previously studied OCs and seven probable clusters that require deeper photometry to establish the nature. We discovered seven new clusters, six of them forming an association of clusters with BPI 14, FSR 777, Kronberger 1 and Stock 8 in the region of the nebula IC 417 and related to the Aur OB2 association, and one embedded in the nebula Sh2-229. We also derive parameters for these three non-FSR07 clusters, because they are important in determining the structure of the Galactic anticentre. Thus, 58 objects are analysed in this work and we could derive fundamental parameters for 28 of them. The scenario in the IC 417 star-forming region is consistent with a sequential event. FSR 888 and FSR 890 are embedded in Sh2-249 within the Gem OB1 association. According to the distance derived for these clusters and those in the association of clusters, both Aur OB2 and Gem OB1 are located in the Perseus arm.

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