Ruprecht 55 or the Two-In-One Cluster

Details Ruprecht 55 or the Two-In-One Cluster Ruprecht 55 or the Two-In-One Cluster

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1728o&link_type=abstract

Astronomical Journal v.110, p.1728

Astronomy and Astrophysics

Astronomy

1

Open Clusters And Associations: Individual: Ruprecht 55, Stars: Early-Type

Scientific paper

The open cluster Ru 55 is found to consist of two partially superimposed groups of young stars, lying at 4.2±0.5kpc, E(B-V) = 0.60±0.15 mag(s.e.)(Ru55A)and7.5±1.1 kpc, E(B-V) = O.6O±O.O9 mag (s.e.) (Ru 55B), respectively. Ru 55A has 27 members, 8 of them previously recognized as part of the former Ru 55 cluster; Ru 55B has 19 probable members, again with 8 objects from the old list. These groups overlap over a relatively small area, which includes the original open cluster location. This eventually led to the idea, in previous papers, of it being a single object. Both clusters are very young, judging from their earliest photometric spectral types, which give an approximate age of 106 yr. Ru 55A is located in the Perseus arm or in the region where that arm and the Local one merge; and Ru 55B is in an external feature (+II), known as "the 15 kpc arm."

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