Elemental abundance analyses with DAO spectrograms - VII. The late normal B stars Pi Ceti, 134 Tauri, 21 Aquilae, and Nu Capricorni and the use of Reticon spectra

Elemental abundance analyses of the sharp-lined normal late B stars π Ceti, 134 Tauri, 21 Aquilae and ν Capricorni are performed consistent with previous papers of this study. These stars have mostly near solar abundances, but each star also shows a few abundances which are a factor of 2 less than solar. The abundances of S, Ti, Fe, and Ni appear to be correlated. Reticon data supplement the co-added photographic spectrograms. Comparison of 261 equivalent widths on 2.4 |mm⁻¹| spectra of sharp-lined B and A stars shows that the Reticon equivalent widths are about 95 per cent of the co-added equivalent widths with subsets of the data showing differences of order 5 per cent from this mean. The Hγ profiles of the co-added and Reticon spectra for eight sharp-lined stars show generally good agreement. The derived values of log g are larger by 0.11 dex on average using the Reticon data. These findings confirm the generally high quality of the co-added data produced from 10 or more spectrograms using the reduce graphics oriented computer reduction code. For five stars previously studied in this series metal lines which fall in the gap between the U and V plates are analysed using Reticon data.