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Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921912b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #219.12; Bulletin of the American Astronomical Society,
Other
Scientific paper
We present near-infrared spectra (R 2000) obtained with the SpeX instrument on the IRTF for 11 binary systems embedded in the nearby ρ Ophiuchi and Serpens dark Clouds. We find that: 6/11 young binary systems have both components exhibiting absorption lines, with 3/6 showing strong absorptions; 8/11 systems have at least one component exhibiting Brγ emission, indicative of active accretion; 8/11 systems have at least one component exhibiting significant continuum veiling, indicative of the presence of hot dust associated with the innermost regions of a disk. We also find 50% ``mixed'' systems, with one component exhibiting veiling (and therefore an associated disk), whereas the other does not, in spite of the fact that these systems are coeval. This result further supports the recent finding of a higher proportion of ``mixed'' systems among the Class I/Flat Spectrum objects than amongst the T-Tauri stars (Haisch, Barsony, Greene, & Ressler 2006, AJ, 132, in press). Finally, there is a trend for the most heavily veiled objects to also have Brackettγ emission, indicating the intimate association of gas accretion with the presence of circumstellar material in the innermost disk regions (as also found by Natta, Testi, & Randich 2006, A&A, 452, 245).
This work was supported by the NASA Faculty Fellows Program awarded to M.B. at NASA's Ames Research Center and by NSF AST-0206146 to M.B.
Barsony Mary A.
Greene Thomas P.
Haisch Karl E. Jr.
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