Smits has recently calculated theoretical He I intensities for a large number of lines for conditions appropriate to gaseous nebulae. These are likely to remain the definitive calculations for some time to come. A comparison of these line ratios with observed values in three nebulae reveals some discrepancies. We show that these discrepancies are reduced when collisional effects from the metastable 23S level are included, and that it is not necessary to invoke an unknown depopulation mechanism for the He I23S level.

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Published in Monthly Notices of the Royal Astronomical Society, v. 282, issue 3, p. 723-725.

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 1996 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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