Tag Archives: recombination lines

The abundance discrepancy factor and t^2 in nebulae: are non-thermal electrons the culprits?

Ferland, G. J.; Henney, W. J.; ODell, C. R.; Peimbert, M. (1) Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA. (2) Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 3-72, 58090 Morelia, Michoacán, México. (3) Department of Physics and … Continue reading

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Dielectronic Recombination Lines of C+

Taha Sochia (1), Peter J. Storeya (1) ((1) University College London, Department of Physics and Astronomy, Gower Street, London, WC1E 6BT) The current paper presents atomic data generated to investigate the recombination lines of C II in the spectra of … Continue reading

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Oxygen abundances from optical O I and O II recombination lines in planetary nebulae with [WC] central stars

Jorge García-Rojas (Instituto de Astrofísica de Canarias, Spain) I will present the analysis of very deep echelle spectra of a dozen planetary nebulae with [WC] or weak emission lines (wels) central stars. Physical conditions (electron density and temperature) are derived … Continue reading

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A classification of HII regions based on Oxygen and Helium lines: The cases of TOL2146-391 and TOL0357-3915

Antonio Peimbert, María A. Peña-Guerrero & Manuel Peimbert (Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, México, C.P. 04510, D.F., Mexico) We present long slit spectrophotometry of two HII regions: TOL2146-391 and TOL0357-3915. We performed a detailed … Continue reading

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On the RL/CEL discrepancy

Grazyna Stasinska Grazyna Stasinska (LUTH, Observatoire de Paris, Meudon, France) The discrepancy between abundances derived from collisionally excited lines (CEL) and recombination lines (RL) in  H II regions and planetary nebulae is still not fully understood. As I understand, the effective recombination rates … Continue reading

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Plasma diagnostics for planetary nebulae and H II regions using N II and O II

I. McNabb (1), X. Fang (1), X.-W. Liu (1,2), P.J. Storey (3) (1) Kavli Institute of Astronomy and Astrophysics at Peking University. (2) Department of Astronomy at Peking University. (3) Department of Physics and Astronomy at University College London We … Continue reading

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