In 1999 IRCAM was equipped with the Mauna Kea consortium L' and M'
filters and a program initiated to reobserve standards through the new filter
set and to establish fainter L' standards. The filters are described in
"The Mauna Kea Observatories Near-Infrared Filter Set. I. Defining
Optimal 1-5 Micron Bandpasses" by Simons & Tokunaga 2002 PASP 114, 169 and
"The Mauna Kea Observatories Near-Infrared Filter Set. II. Specifications
for a New JHKL'M' Filter Set for Infrared Astronomy" by Tokunaga et al. 2002
PASP, 114, 180. Our results appear in
L' and M' standard stars for the Mauna Kea
Observatories Near-Infrared (MKO-NIR) system
by Leggett et al. 2003 Mon.Not.R.astr.Soc. 345, 144.
The results are summarised below, where we also give
links to older files giving L and M magnitudes for brighter
standards. Note the older results are not on the MK system however
differences between L' and M' systems are expected to be
small for these spectral types (see discussion in Leggett et al. 2003).
UKIRT standards observed with the Mauna Kea JHKL'M'
system, text file
of IR Bright (mag < 8) JHKLL'M Standards
Very Bright (mag < 6) JHKLL'MNQ Stars