No Open Cluster in the Ruprecht 93 Region
S. Cheon, H. Sung, M.S. Bessell
TL;DR
This study used CCD photometry to investigate the Ruprecht 93 region, finding no evidence of an open cluster but identifying two young star groups at different distances and an abnormal extinction law.
Contribution
The paper provides the first CCD photometric analysis of Ruprecht 93, clarifies the non-existence of the cluster, and identifies two young star groups with distinct properties.
Findings
No open cluster confirmed in Ruprecht 93 region.
Two young star groups identified at 2.1 kpc and 4.8 kpc.
An abnormal extinction law (Rv=3.5) found in the region.
Abstract
UBVI CCD photometry has been obtained for the Ruprecht 93 (Ru 93) region. We were unable to confirm the existence of an intermediate-age open cluster in Ru 93 from the spatial distribution of blue stars. On the other hand, we found two young star groups in the observed field: the nearer one (Ru 93 group) comprises the field young stars in the Sgr-Car arm at d ~ 2.1 kpc, while the farther one (WR 37 group) is the young stars around WR 37 at d ~ 4.8 kpc. We have derived an abnormal extinction law (Rv = 3.5) in the Ruprecht 93 region.
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