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Title: Accretion and OH photodissociation at a nearby T Tauri system in the β Pictoris moving group

We present spectra of an M-type, binary star system (LDS 5606) that belongs to the nearby ∼20 Myr old β Pictoris moving group. Both stars are very dusty; the dustier member displays optical emission lines from eight elements indicative of ongoing mass accretion. The spectra of both stars contain oxygen forbidden line emission at 6302 and 5579 Å, consistent with a recent model of far ultraviolet photodissociation of OH molecules in a circumstellar disk. These are the oldest dwarf stars presently known to display such a phenomenon. The spectral energy distribution of the dustier star indicates substantial quantities of dust as hot as 900 K, and its fractional infrared luminosity (L {sub IR}/L {sub bol}) is almost as large as that of the main sequence record holder, V488 Per. The LDS 5606 binary joins a remarkable group of very dusty, old, T Tauri stars that belong to widely separated multiple systems.
Authors:
;  [1] ;  [2]
  1. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
  2. Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile)
Publication Date:
OSTI Identifier:
22356621
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 788; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; DISSOCIATION; DUSTS; DWARF STARS; EMISSION; ENERGY SPECTRA; FAR ULTRAVIOLET RADIATION; LUMINOSITY; MASS; MATTER; MOLECULES; OXYGEN; PHOTOLYSIS; T TAURI STARS