The curious case of PDS 11: a nearby, >10 Myr old, classical T Tauri binary system
arXiv:1703.05945 · doi:10.3847/1538-3881/aa67f6
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 Li I 6708 Angstrom, 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 Li I 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.
Accepted for publication in The Astronomical Journal (13 pages, 10 figures)
References in corpus (13)
- New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
- A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood
- An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
- UV excess measures of accretion onto young very low-mass stars and brown dwarfs
- Accretion in the Rho-Oph pre-main sequence stars
- The evolution of stars in the Taurus-Auriga T association
- A Distributed Population of Low Mass Pre-Main Sequence Stars near the Taurus Molecular Clouds
- SSPMJ1102-3431 brown dwarf characterization from accurate proper motion and trigonometric parallax
- Search for associations containing young stars (SACY) VII. New stellar and substellar candidate members in the young associations
- Identification of the TW Hya Association member 2M123539: a tertiary component of the HR 4796 system
- A Dusty M5 Binary in the beta Pictoris Moving Group
- Accretion and OH Photodissociation at a Nearby T Tauri System in the beta Pictoris Moving Group
- Evidence for Variable, Correlated X-ray and Optical/IR Extinction toward the Nearby, Pre-main Sequence Binary TWA 30