Abstract
We have obtained high resolution optical spectra of the planetary nebula Hu 1-2 in the wavelength region of 3700 A-10 050 A, with the Hamilton Echelle Spectrograph (HES) at Lick Observatory. Diagnostic analysis indicates that the nebular gas can be represented by inhomogeneous shells of electron density N� � 4000-10 000 cm −3 , and a gas temperature of 12 000-18 000 K. Using the spherically symmetric photoionization model with appropriate abundances, we tried to accom- modate the observed physical conditions and high electron temperatures. The chemical composition of the nebula was derived from calculations using a photoionization model which predicts the observed IUE, HES and ISO line intensities; and the com- position was then compared to previous determinations. Model analysis confirms the semi-empirically determined abundance derivations carried out in earlier studies. He and N abundances are high, but those of C, O, Ne and S are very low.
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