The low-mass population of Upper Scorpius with Gaia DR2

  1. V. J. S. Bjar
  2. Antonio Pérez Garrido 1
  3. P. Chinchilla
  4. N. Lodieu
  5. R. Rebolo
  6. M. R. Zapatero Osorio
  7. B. Gauza
  8. K. Y. Peña-Ramírez
  1. 1 Universidad Politécnica de Cartagena
    info

    Universidad Politécnica de Cartagena

    Cartagena, España

    ROR https://ror.org/02k5kx966

Proceedings:
20th Cambridge Workshop: Cool Stars, Stellar Systems, and the Sun: Cambridge, del 29 de julio al 3 de agosto de 2018

Year of publication: 2018

Type: Conference paper

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Abstract

Using 2MASS and Denis catalogs, we perfomred a search for very low-mass stars and browndwarf candidates covering an area of 168 deg2in the Upper Scorpius association (∼ 10 Myr,∼ 145 pc). From I, I −J and I, I −Ks color-magnitude diagrams, we selected 1257 candidatesin the magnitude range I=13-18.5 mag, which follow the photometric sequence of previouslyknown members. Using the position on the sky, parallaxes and proper motions from the GaiaDR2 data, we determined bona fide members, searched for companions, and investigated thedistance, spatial structure and the kinematic of the association.