IZ photometry of L dwarfs and the implications for brown dwarf surveys

Details IZ photometry of L dwarfs and the implications for brown dwarf surveys IZ photometry of L dwarfs and the implications for brown dwarf surveys

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.313l..43s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 313, Issue 4, pp. L43-L45.

Astronomy and Astrophysics

Astronomy

10

Stars: Low-Mass, Brown Dwarfs

Scientific paper

The I-Z colour has recently been shown to be a good temperature indicator for M dwarfs. We present the first IZ photometry of a small sample of L dwarfs ranging in spectral type from L0.5V to L6.0V. We find that the I-Z colour is not a good temperature indicator for objects between L1V and L5V, such objects having colours that overlap with mid M dwarfs. We attribute this to the reduction in the strength of the TiO and VO bands in the L dwarfs, which are the dominant opacity source in the I band for late M dwarfs. Beyond L5V, I-Z appears to be a reasonable indicator. This has important implications for the planning of optical surveys for cool objects in clusters and the field. For example, I-Z will cease to be a good method of identifying brown dwarfs in the Pleiades below around 0.04Msolar, and at around 0.075Msolar in the Hyades and Praesepe.

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