4 JHKL photometry

Observations in the J, H, K and L bands (1.2, 1.6, 2.2, and 3.4 $\mu$m) were obtained at the South African Astronomical Observatory (SAAO) for 138 Henize stars.

The majority of the observations were made with the Mk II IR photometer on the 0.75 m telescope at SAAO, Sutherland, although a few measurements were made with the 1.0 m there. The observations were reduced to the SAAO system using the standards of Carter (1990). For a few of the stars observations have been previously reported in Catchpole et al. (1979). These early observations have been corrected to the Carter (1990) system and where necessary meaned with later observations. The accuracy of the photometry is typically better than 0.06 mag in J and H, 0.04 mag in K and 0.1 mag in L. The values given in Table 5 are based on multiple observations for a number of the stars, especially variables or suspected variables.

These colours were dereddened using the colour excess E_B-V obtained in Sect. 3.3 combined with unpublished colour excess ratios for the SAAO system kindly made available by Dr. I. Glass (1999, priv. comm.).