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Filter Change for IRIM (1Sep93)
(from KPNO, NOAO Newsletter No. 35, 1 September 1993)

The infrared camera IRIM has space for only a limited number of
filters. Presently these are broadband J, H, "special" K (2.00-2.30
microns), and narrowband 2.12, 2.16, 2.22, and 2.36 microns.

The "special" K filter allows improved sensitivity for continuum
sources by excluding the thermal part of the background. However, this
filter does not include the CO bandhead seen in giants and included in
the traditional K filter (2.0-2.4 microns). In response to several
requests for standard K and an evident lack of interest in the 2.36
micron filter, the latter will be removed and the former installed in
IRIM for spring 1994. The filter complement will then be:

o  broadband J, H, K (2.0-2.4 microns), special K (2.0-2.3 microns)

o  narrowband 2.12 (1.5% BW), 2.16 (1.5% BW), 2.22 (4% BW)

Ron Probst

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