Theoretical HeI line intensities in gaseous nebulae: NGC 1976, 6572 and IC 4997

Details Theoretical HeI line intensities in gaseous nebulae: NGC 1976, 6572 and IC 4997 Theoretical HeI line intensities in gaseous nebulae: NGC 1976, 6572 and IC 4997

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.282..723k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 3, pp. 723-725.

Astronomy and Astrophysics

Astronomy

5

Ism: Abundances, Planetary Nebulae: General

Scientific paper

Smits has recently calculated theoretical HeI 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 2^3S level are included, and that it is not necessary to invoke an unknown depopulation mechanism for the HeI 2^3S level.

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