Tag Archives: abundances

The chemical composition of Galactic ring nebulae around massive stars

C. Esteban (1,2), A. Mesa-Delgado (3), C. Morisset (4), J. Garcia-Rojas (1,2) (1) Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain. (2)Departamento de Astrofísica, Universidad de La Laguna, E-38206, La Laguna, Tenerife, Spain. (3) Instituto de Astrofísica, Facultad … Continue reading

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Physical properties of the interstellar medium using high-resolution Chandra spectra: O K-edge absorption

E. Gatuzz (1), J. García (2), C. Mendoza (1,3), T. R. Kallman (4), M. A. Bautista (3), T. W. Gorczyca (3) (1) Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), PO Box 20632, Caracas 1020A, Venezuela, (2) Harvard-Smithsonian Center … Continue reading

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Improved log(gf) Values for Lines of Ti II and New Titanium Abundances in the Sun and the Metal-Poor Star HD 84937

Wood, Michale (1), Lawler J. E. (1), Sneden C. (2) and Cowan J. J. (3) ((1) University of Wisconsin; (2) University of Texas; (3) University of Oklahoma) New atomic transition probability measurements for 364 lines of Ti II in the … Continue reading

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Strontium: To LTE or non-LTE that is the question

C. J. Hansen (1), M. Bergemann (2), G. Cescutti (3), P. Francois (4), A. Arcones (5), A. I. Karakas (6), K. Lind (2), and C. Chiappini (3) ((1) Landessternwarte, ZAH, K ̈ nigstuhl 12, 69117 Heidelberg, Germany; (2) Max-Planck Institute … Continue reading

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NLTE analysis of Sr lines

Bergemann, M. (1), Hansen, C. J. (2) Bautista, M. (3) and Ruchti, G. (4) ((1) Max-Planck Institute for Astrophysics, Karl-Schwarzschild Str. 1, 85741, Garching, Germany; (2) Landessternwarte, Königstuhl 12, 69117, Heidelberg, Germany; (3) Department of Physics, Western Michigan University, Kalamazoo, … 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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Oxygen abundances in ionized nebulae from photoionization model fitting

Christophe Morisset (Instituto de Astronomia-­UNAM, Mexico) In this talk I will present a review on the determination of oxygen abundance from photoionization models of nebulae. I will first describe the way models are performed using photoionization codes, explaining the necessary … Continue reading

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Temperature-­based oxygen abundances in H II regions and PNe: methods and uncertainties

Mónica Rodríguez ( INAOE, Mexico) The oxygen abundances of H II regions and planetary nebulae (PNe) provide crucial clues for our understanding of galactic chemical evolution, especially when they are compared with each other and with the abundances derived for stars of … Continue reading

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The Solar oxygen abundance as derived using MHD atmospheric models

Damian Fabbian (Instituto de Astrofísica de Canarias, Spain) We present our initial results on the re-determination of the solar chemical composition using 3D photospheric models that include magnetic fields, a method for the first time employed in determining  the Sun’s … Continue reading

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Manganese in dwarf spheroidal galaxies

P. North (1), G. Cescutti (2,1), P. Jablonka (1,3), V. Hill (4), M. Shetrone (5), B. Letarte (6), B. Lemasle (7), K.A. Venn (8), G. Battaglia (9), E. Tolstoy (7), M.J. Irwin (10), F. Primas (9), and P. Francois (3)  ((1) Laboratoire d’astrophysique, Observatoire de Sauverny, Versoix,  … Continue reading

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