6 IRAS photometry

The K-[12] and K-[25] colour indices have been computed from IRAS non-colour-corrected fluxes of good quality (quality flag of 3); they are listed in Table 5. The colour index K-[i] is defined as $K-[i] = K+2.5\times \log[F(i)/F_0(i)]$, where F(i) is the (non colour-corrected) flux in the i band from the IRAS Point Source Catalogue, $F_0(12~\mu$m) = 28.3 Jy, and $F_0(25~\mu$m) = 6.73 Jy.

The IRAS fluxes of Hen 55 (= IRAS 08457-4548) have been disregarded, because this star is very near from IRAS 08459-4547 located about 2' to the east, and possibly contaminating its IRAS fluxes. Despite a quality flag of 3 at $25~\mu$m, Hen 2 (= IRAS 01309-7913) has also been excluded because its $25~\mu$m flux is at the IRAS sensitivity limit (0.2 Jy) and leads to an unphysical K-[25] colour falling to the blue of the Rayleigh-Jeans point.