Bibcode
Valdivielso, L.; Bouy, H.; Martin, E. L.
Bibliographical reference
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held in Madrid, September 13 - 17, 2010, Eds.: M. R. Zapatero Osorio, J. Gorgas, J. Maíz Apellániz, J. R. Pardo, and A. Gil de Paz., p. 513-517
Advertised on:
11
2011
Citations
0
Refereed citations
0
Description
In a previous study, Virtual Observatory tools were used to cross-match
the IPHAS catalogue with the 2MASS catalogue for searching young very
low-mass objects. We defined photometric criteria to identify Halpha
emission sources with near-infrared colors similar to known young very
low-mass stars and brown dwarfs. Spectral types have been derived for
the 33 candidates that have spectroscopically confirmed Halpha emission
and spectral class M. Many objects also have weak NaI doublet, an
indication of low surface gravity. Here we focus on a deeper study of
the targets. We found that many of them display a clear excess in the
Spitzer bandpasses, commonly associated with the presence of
circumstellar material. Together with their strong Halpha emission,
which must be associated to accretion, the mid-infrared excesses confirm
the youth of these objects.