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New nearby young star cluster candidates within 200 pc

Published online by Cambridge University Press:  01 August 2006

Eric E. Mamajek
Eric E. Mamajek*
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., MS-42, Cambridge, MA, 02138, USA email: emamajek@cfa.harvard.edu
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Abstract

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I briefly describe two new young star cluster candidates found within 200 pc of the Sun, associated with the 4th-magnitude stars μ Oph and 32 Ori. The μ Oph group (d ≃ 170pc) has a space motion and age (~120± 25 Myr) suspiciously similar to the Pleiades, but lies in the opposite side of the sky behind ~0.9 mag of visual extinction in Ophiuchus. The 32 Ori group is a nearby (d ≃ 90 pc) loose aggregate of ~25-Myr-old post-T Tauri stars co-moving with the massive binary 32 Ori (B5V+B7V) in northern Orion. The 32 Ori group accounts for part of the population of “isolated” Li-rich RASS pre-MS stars in northern Orion.

Keywords

Galaxy: open clusters and associationssolar neighborhoodstars: pre–main-sequence