Low-Mass Stars and Brown Dwarfs Around σ Orionis

Details Low-Mass Stars and Brown Dwarfs Around σ Orionis Low-Mass Stars and Brown Dwarfs Around σ Orionis

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..645k&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

1

Sigma Orionis, Sigma Ori, Spectroscopy

Scientific paper

We present optical spectroscopy of 71 photometric candidate low-mass members of the cluster associated with σ Orionis. Thirty-five of these are found to pass the lithium test and hence are confirmed as true cluster members, covering a mass range of ≤0.055-0.3 Msun, assuming a mean cluster age of ≤5 Myr. We find evidence for an age spread on the (I, I-J) colour magnitude diagram, members appearing to lie in the range 1-7 Myr. There are, however, a significant fraction of candidates that are non-members, including some previously identified as members based on photometry alone. We see some evidence that the ratio of spectroscopically confirmed members to photometric candidates decreases with brightness and mass. This highlights the importance of spectroscopy in determining the true initial mass-function.

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