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MBM12: A Close, Younger Version of the TW Hydrae AssociationMBM 12 is a dark cloud located about 65 pc from the sun. During the late 1980's and early 1990's, five Classical T Tauri stars were discovered associated with the cloud. The co-existence of the cloud and several stars with disks implies a very young association, very close to the earth. Such an association would be in a league with TWA and Eta Cham. However, at an estimated age of about 1 Myrs. Brown dwarfs/Jupiters would be brighter and disk should be more numerous. Deep ROSAT images and follow up spectroscopic observations raised the cluster membership to 8. We have expanded on this study with deep groundbased imaging, followup spectroscopy and infrared data. We discuss our current data base of U through I observations (complete to V=20) J through K observations (complete to K=14) and spectra of most stars above V magnitude 15. We will present a mass function for the about 40 stars now identified with the association and discuss disk, binary and brown dwarf candidates.
Document ID
20000039374
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Wolk, S. J.
(Smithsonian Astrophysical Observatory Cambridge, MA United States)
Hearty, T.
(Smithsonian Astrophysical Observatory Cambridge, MA United States)
Jayawardhana, R.
(Smithsonian Astrophysical Observatory Cambridge, MA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Astrophysics
Meeting Information
Meeting: From Darkness to Light: Origins and Early Evolution of Young Stellar Clusters
Location: Corsica
Country: France
Start Date: March 31, 2000
End Date: April 9, 2000
Funding Number(s)
CONTRACT_GRANT: NAS8-39073
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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