- Conference date: 21–25 July 2008
- Location: St. Andrews (Scotland)
We present initial results of a search for the substellar mass population of the Orion OB1 a and b associations, based on a deep optical/near‐IR survey. We are complete to about 1 magnitude fainter than the 2MASS survey at K. Global comparison of the K vs. color‐magnitude diagram shows an excess of objects with (the substellar limit in Orion OB1b) and The BVRIJHK spectral energy distributions are consistent with unreddened 2 Myr old substellar mass objects at the distance of Orion OB1b. Near‐IR spectra confirm spectral types near M7, and show the triangular H‐band continuum shape associated with young (low gravity) objects. Space densities of these objects exceed a few near δ Orionis.
- Mass spectra
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