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Spitzer Observations of M33 and the Hot Star, H II Region Connection
Robert H. Rubin, Janet P. Simpson, Sean W. J. Colgan +7
We have observed emission lines of [S IV] 10.51, H(7-6) 12.37, [Ne II] 12.81, [Ne III] 15.56, and [S III] 18.71 um in a number of extragalactic H II regions with the Spitzer Space…
Spitzer Observations of M83 and the Hot Star, H II Region Connection
Robert H. Rubin, Janet P. Simpson, Sean W. J. Colgan +6
We have undertaken a program to observe emission lines of SIV 10.5, NeII 12.8, NeIII 15.6, & SIII 18.7 um in a number of extragalactic HII regions with the Spitzer Space Telescope.…
Helium Recombination Lines as a Probe of Abundance and Temperature Problems
Y. Zhang, R. H. Rubin, X. -W. Liu
The paper presents a simplified formula to determine an electron temperature, Te(He I), for planetary nebulae (PNe) using the He I 7281/6678 line flux ratio. In our previous studie…
Breit-Pauli energy levels, transition probabilities, and lifetimes for 3d^5 levels in Fe IV of astrophysical interest
Charlotte Froese Fischer, Robert H. Rubin
Energy levels, lifetimes, and transition probabilities for transitions between computed levels of 3d^5 of Fe IV are reported. The E2 and M1 transition probabilities are compared wi…
Flux ratio [Ne V] 14.3/24.3 as a test of collision strengths
R. H. Rubin
From ISO [Ne V] 14.3/24.3 micron line flux ratios, we find that 10 out of 20 planetary nebulae (PNs) have measured ratios below the low-electron density (N_e) theoretical predicted…
The ionization equilibrium of iron in H II regions
M. Rodriguez, R. H. Rubin
We study the ionization equilibrium of Fe using photoionization models that incorporate improved values for the ionization and recombination cross-sections and the charge-exchange…