Search for Possibly Evolutionary Linked Globular and Open Clusters

Abstract

Based on a large sample of 133 Galactic globular clusters we obtained a new estimate of the frequency of globular-cluster impacts onto the Galactic plane, which we found to be equal to three events per 1 Myr. Our computations involving new kinematical data do not support the well-known hypothesis about the possible origin of the open cluster Stephenson 2 as a result of the massive globular cluster ω Cen crossing the Galactic disk. Our results also do not support the well-known hypothesis that the globular cluster NGC6397 could trigger the formation of the open cluster NGC6231. We found for the first time six globular clusters, which could have triggered the formation of an open cluster when crossing the Galactic plane. These are the globular clusters NGC104, NGC2808, NGC6362, NGC6540, NGC6749, and NGC6752. For each of these clusters we identify one or several open clusters, which were possibly born via such scenario. In our opinion, of greatest interest are the pairs NGC104-Ruprecht 129, and NGC6362-Pismis 11.1

Search for the evolutionary relationship between Galactic globular and open clusters using data from the Gaia DR2 catalogue

“…According to works Salerno et al (2009); Vande Putte & Cropper (2009), this value is 1 event for a million years. In Bobylev & Bajkova (2019), an estimate equal to 3 events within a million years, which is closer to the present one, was obtained. As it is seen from Fig.…”

“…According to worksSalerno et al (2009);Vande Putte & Cropper (2009), this value is 1 event for a million years. InBobylev & Bajkova (2019), an estimate equal to 3 events within a million years, which is closer to the present one, was obtained. As it is seen from Fig.1, most of the impacts occur in the central region of the Galactic disk.Next, a search was carried out for new couples, potential GC -OC pairs, with possible evolutionary relationship.…”

“…As can be seen from the the first time it was shown that the formation of associations consisting of multiple OCs is possible. Bobylev & Bajkova (2019) also noted such possibility. However, the names of specific clusters in these works mostly disagree, excepting only the globular clusters NGC 104 and NGC 5139 (ω Cen) mentioned by all authors.…”

“…They found that potentially promising in the above sense are globular clusters NGC 3201, NGC 6397 and NGC 6838. Based on more extensive and reliable data, the analysis was repeated in Bobylev & Bajkova (2019) using a sample of 133 Galactic globular clusters, in which pairs NGC 104 -Ruprecht 129 and NGC 6362 -Pismis 11 were recognized as the most interesting. And in Bobylev & Bajkova (2018), the hypothesis of the formation of the Gould Belt after intersection of the disk by a globular cluster ω Cen was analyzed as well.…”