Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.1502w&link_type=abstract
American Astronomical Society Meeting 205, #15.02; Bulletin of the American Astronomical Society, Vol. 36, p.1362
Astronomy and Astrophysics
Astronomy
Scientific paper
The results of a combined optical imaging and spectroscopic survey of candidate CTTS in a 1.3 square degree region encompassing the L1688 cloud is presented. Using Hydra at the WIYN telescope, we have obtained spectra for 139 stars leading to the identification of 88 as association members. Thirty-nine of the stars display strong Hα emission, including two brown dwarfs, and are identified with CTTS. The association members are distributed in the lower extinction regions surrounding the the L1688 core, and when comparing their luminosities and temperatures to theoretical models, have a median age that is significantly older than young stars in the core. The age and distribution of this population are consistent with being low mass members of the Upper Scorpius subgroup in the Sco-Cen OB association whose formation was triggered by massive stars in the Upper-Centaurus Lupus and Lower-Centaurus Crux subgroups.
This work was supported in part by NSF AST-9820898 and the Missouri Research Board.
Greene Thomas P.
Meyer Michael R.
Robinson John G.
Wilking Bruce A.
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