Determination of the helium abundances in galactic planetary nebulae

Details Determination of the helium abundances in galactic planetary nebulae Determination of the helium abundances in galactic planetary nebulae

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26at...22..833h&link_type=abstract

Astronomical and Astrophysical Transactions, vol. 22, Issue 6, p.833-836

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We present the results of detailed studies on the He ionic abundances in galactic planetary nebulae. They are based on the newest emissivity data obtained by Benjamin et al. and take into account both the radiative transfer effects in the He I emission lines and the impact excitation of He and H atoms. The new values of the He +-to-H + and He-to-H ratios are obtained for different cases of He I line conjunctions.

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