• K. M. Aggarwal

      Articles written in Journal of Astrophysics and Astronomy

    • The O III 52 ▪m/88 ▪m emission-line ratio in planetary nebulae

      F. P. Keenan K. M. Aggarwal

      More Details Abstract Fulltext PDF

      R-matrix calculations of electron impact excitation rates in 0 III are used to derive the electron-density-sensitive emission-line ratioR = 1 (2s2 2p23P2-2s22P23P1)/I (2s22p23P1 - 2s22p23P0) =I (52μm)/I (88μm) for a range of electron temperatures(Te = 5000-20000 K) and densities(Ne=10–105 cm−3) applicable to planetary nebulae. Electron densities deduced from the observed values ofR in several planetary nebulae are in excellent agreement with those deduced from C1 I and Ar IV, which provides support for the accuracy of the atomic data adopted in the calculations.

    • [OIII] Electron temperatures in planetary nebulae

      F. P. Keenan K. M. Aggarwal

      More Details Abstract Fulltext PDF

      Relative level populations for O III, derived using electron impact excitation rates calculated with the R-matrix code, are used to deduce the electron-temperature-sensitive emission-line ratioR=I(2s22p21D–2s22p21S)/I(2s2 2p23P1,2–2s22p21D) =I(4363 Å)/I(4959 + 5007 Å) for a range ofTe = (7500–20000 K) applicable to planetary nebulae. Electron temperatures deduced from the observed values ofR in several planetary nebulae are in excellent agreement with those determined fromTe-sensitive line ratios in other species, including CIII]/C [II], [NII] and [ArIII], which provides support for the accuracy of the atomic data adopted in the level population calculations.

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      Posted on January 27, 2016

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      Posted on July 25, 2019

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