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We present results of our study of PDS 11 binary system, which belongs to arare class of isolated, high galactic latitude T Tauri stars. Our spectroscopicanalysis reveals that PDS 11 is a M2-M2 binary system with both componentsshowing similar H-alpha emission strength. Both the components appear to beaccreting, and are classical T Tauri stars. The lithium doublet Li I 6708Angstrom, a signature of youth, is present in the spectrum of PDS 11A, but notin PDS 11B. From the application of lithium depletion boundary age-datingmethod and a comparison with the Li I 6708 equivalent width distribution ofmoving groups, we estimated an age of 10-15 Myr for PDS 11A. Comparison withpre-main sequence evolutionary models indicates that PDS 11A is a 0.4 solarmass T Tauri star at a distance of 114-131 pc. PDS 11 system does not appear tobe associated with any known star forming regions or moving groups. PDS 11 is anew addition, after TWA 30 and LDS 5606, to the interesting class of old,dusty, wide binary classical T Tauri systems in which both components areactively accreting.

The curious case of PDS 11: a nearby, >10 Myr old, classical T Tauri binary system