The Missing M Dwarfs

Details The Missing M Dwarfs The Missing M Dwarfs

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003iaus..211..171j&link_type=abstract

Brown Dwarfs, Proceedings of IAU Symposium #211, held 20-24 May 2002 at University of Hawaii, Honolulu, Hawaii. Edited by Eduard

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We present evidence for a drop in the luminosity function around spectral type M7-M8. This shows in both field stars and the clusters σ-Orionis, the Trapezium, IC 348, IC 2391, α-Perseii, the Pleiades and, possibly, the globular cluster M4. This can be explained by a sudden drop in the luminosity-mass relation. Theoretical models, which include dust, do not show this effect, although they predict dust forming at about spectral type M7. We suggest that this drop in the luminosity-mass relation could be modelled by considering larger size dust grains. The drop in the luminosity-mass relation suggests that star/brown dwarf masses below M7-M8 will be larger than predicted by current models.

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