Abstract Details

Name: Blesson Mathew
Affiliation: TIFR
Conference ID: ASI2017_1236
Title : The curious case of PDS 11: a nearby, >10 Myr old, classical T Tauri binary system
Authors and Co-Authors : P. Manoj (TIFR), B. C. Bhatt (IIA), D. K. Sahu (IIA), G. Maheswar (ARIES), S. Muneer (IIA)
Abstract Type : Oral
Abstract Category : Stars,ISM and the Galaxy
Abstract : We present results of our study of PDS 11 binary system, which belongs to a rare class of isolated, high galactic latitude T Tauri stars. Our spectroscopic analysis reveals that PDS 11 is a M2 - M2 binary system with both components showing similar H$\alpha$ emission strength. Both the components appear to be accreting, and are classical T Tauri stars. The lithium doublet LiI 6708, a signature of youth, is present in the spectrum of PDS 11A, but not in PDS 11B. From the application of lithium depletion boundary age-dating method and a comparison with the LiI 6708 equivalent width distribution of moving groups, we estimated an age of 10 - 15 Myr for PDS 11A. Comparison with pre-main sequence evolutionary models indicates that PDS 11A is a 0.4 solar mass T Tauri star at a distance of 114 - 131 pc. PDS 11 system does not appear to be associated with any known star forming regions or moving groups. PDS 11 is a new addition, after TWA 30 and LDS 5606, to the interesting class of old, dusty, wide binary classical T Tauri systems in which both components are actively accreting.