Abstract
We present MK spectral types of a sample of selected (bright) stars associated with the galactic cluster Haffner 18 in Puppis. They were obtained from low-resolution (λ / Δ λ = 1720) spectra by H α slit spectroscopy. Some of the selected stars were also observed photoelectrically in the uvby- β system. Our spectroscopic data show that over 1/4 of the estimated 50 star members of the cluster are O and early B stars. We give MK spectral types and discuss the individual stars observed. Finally, based on these spectroscopic results, on our photometry, and on published data we briefly reinspect the physical parameters of the cluster.
