Tag Archives: nebulae

Young stars and ionized nebulae in M83: comparing chemical abundances at high metallicity

Posted on August 2, 2016 by AstroAtom

Fabio Bresolin (1), Rolf-Peter Kudritzki (1), Miguel A. Urbaneja (2), Wolfgang Gieren (3), I-Ting Ho (1), Grzegorz Pietrzynski (3). (1) Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA. (2) Institut für Astro- und Teilchenphysik, Universität … Continue reading →

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The chemical composition of Galactic ring nebulae around massive stars

Posted on June 1, 2016 by AstroAtom

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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Testing the existence of non-Maxwellian electron distributions in H II regions after assessing atomic data accuracy

Posted on May 19, 2014 by AstroAtom

C. Mendoza(1,2), M. A. Bautista (1) (1) Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA, (2) Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), PO Box 20632, Caracas 1020A, Venezuela. The classic optical nebular diagnostics [N II], … Continue reading →

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Iron Mining Eta Carinae’s Archived Spectra and Benchmarking Atomic Data

Posted on January 22, 2013 by AstroAtom

Urech Alexander (1), Bautista M. (1), Gull T. R. (2), Hartman H. (3) and Fivet V. (1) ((1) Western Michigan University; (2) NASA Goddar Space Flight Center; (3) Lund Observatory, Sweden) Fe II has proven to be one of the … Continue reading →

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Temperature fluctuations in ionized nebulae and their effect on the oxygen abundance determination

Posted on July 24, 2012 by AstroAtom

Antonio Peimbert (Instituto de Astronomia–UNAM, Mexico) The two most common ways of determining chemical abundances on ionized regions are: 1.- the one that comes from assuming homogeneous temperature and using the observed collisionally excited line ratios (the direct method) and … Continue reading →

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Oxygen abundances in ionized nebulae from photoionization model fitting

Posted on July 24, 2012 by AstroAtom

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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Atomic processes in photoionized gaseous nebulae

Posted on July 31, 2011 by AstroAtom

Xiaowei Liu (Kavli Institute for Astronomy & Astrophysics, Beijing 100871, China) In this review, I will highlight some major progresses on the study of atomic processes in photoionized gaseous nebulae since the last PN symposium. Invited review given at the IAU … Continue reading →

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Probing the properties of nebular plasmas with optical and IR spectroscopy

Posted on July 29, 2011 by AstroAtom

M. J. Barlow (Dept of Physics & Astronomy, University College London) Ionized nebulae provide spectacular probes of conditions that cannot easily be recreated in the laboratory. Their spectra are dominated by dipole-forbidden transitions from ions of carbon, nitrogen, oxygen, neon … Continue reading →

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