Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium

Belay Sitotaw Goshu

doi:doi:10.11648/j.ajaa.20170505.11

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Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium

Belay Sitotaw Goshu

Received: 25 September 2017 Accepted: 30 October 2017 Published: 19 January 2018

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Abstract

A number of models were utilized to study hydrogen and helium ionization structure by assessing the impacts of effective temperatures by different scholars. But this work mainly focused on two temperatures, 35 000 K and 45 000 K and enhancement of abundances. Each model is characterized based on the solar abundances and enhanced abundances by scale factors of 5. The photoionization code cloudy was used to construct the model of the nebulae. The result revealed that at high temperature 45 000 K, the sphere of helium close to hydrogen whereas at low temperature 35 000 K, hydrogen ion ratio is more dominant than helium and its radius is greater than it. Moreover, the chemical abundances ratio at each stage of ionization depends oneffective temperatures and enhancement of abundances.

DOI	10.11648/j.ajaa.20170505.11
Published in	American Journal of Astronomy and Astrophysics (Volume 5, Issue 5, September 2017)
Page(s)	50-56
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Photoionization, Chemical Abundances, Nebulae, Enhancement

References

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[5]	Morisset C., 2017, Planetary Nebulae: Multi-wavelength probes of stellar and galactic evolution, International Astronomical Union Proceedings IAU Symposium No. 323, 2017.
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[8]	Tielens A. G. G. M., The physics and the chemistry of the interstellar medium, 2005, Cambridge university press, pp 240.
[9]	Holweger H., Photospheric Abundances: Problems, Updates, Implications. In R. F. Wimmer-Schweingruber, editor, Joint SOHO/ACE workshop\Solar and Galactic Composition", volume 598 of American Institute of Physics Conference Series, page 23, 2001. doi: 10.1063/1.1433974.
[10]	Allende Prieto C., Lambert D. L., and Asplund M., the Forbidden Abundance of Oxygen in the Sun. ApJ, 556: L63-L66, July 2001. doi: 10.1086/322874.
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Belay Sitotaw Goshu. (2018). Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium. American Journal of Astronomy and Astrophysics, 5(5), 50-56. https://doi.org/10.11648/j.ajaa.20170505.11

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ACS Style

Belay Sitotaw Goshu. Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium. Am. J. Astron. Astrophys. 2018, 5(5), 50-56. doi: 10.11648/j.ajaa.20170505.11

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AMA Style

Belay Sitotaw Goshu. Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium. Am J Astron Astrophys. 2018;5(5):50-56. doi: 10.11648/j.ajaa.20170505.11

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@article{10.11648/j.ajaa.20170505.11,
  author = {Belay Sitotaw Goshu},
  title = {Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium},
  journal = {American Journal of Astronomy and Astrophysics},
  volume = {5},
  number = {5},
  pages = {50-56},
  doi = {10.11648/j.ajaa.20170505.11},
  url = {https://doi.org/10.11648/j.ajaa.20170505.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajaa.20170505.11},
  abstract = {A number of models were utilized to study hydrogen and helium ionization structure by assessing the impacts of effective temperatures by different scholars. But this work mainly focused on two temperatures, 35 000 K and 45 000 K and enhancement of abundances. Each model is characterized based on the solar abundances and enhanced abundances by scale factors of 5. The photoionization code cloudy was used to construct the model of the nebulae. The result revealed that at high temperature 45 000 K, the sphere of helium close to hydrogen whereas at low temperature 35 000 K, hydrogen ion ratio is more dominant than helium and its radius is greater than it. Moreover, the chemical abundances ratio at each stage of ionization depends oneffective temperatures and enhancement of abundances.},
 year = {2018}
}

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TY  - JOUR
T1  - Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium
AU  - Belay Sitotaw Goshu
Y1  - 2018/01/19
PY  - 2018
N1  - https://doi.org/10.11648/j.ajaa.20170505.11
DO  - 10.11648/j.ajaa.20170505.11
T2  - American Journal of Astronomy and Astrophysics
JF  - American Journal of Astronomy and Astrophysics
JO  - American Journal of Astronomy and Astrophysics
SP  - 50
EP  - 56
PB  - Science Publishing Group
SN  - 2376-4686
UR  - https://doi.org/10.11648/j.ajaa.20170505.11
AB  - A number of models were utilized to study hydrogen and helium ionization structure by assessing the impacts of effective temperatures by different scholars. But this work mainly focused on two temperatures, 35 000 K and 45 000 K and enhancement of abundances. Each model is characterized based on the solar abundances and enhanced abundances by scale factors of 5. The photoionization code cloudy was used to construct the model of the nebulae. The result revealed that at high temperature 45 000 K, the sphere of helium close to hydrogen whereas at low temperature 35 000 K, hydrogen ion ratio is more dominant than helium and its radius is greater than it. Moreover, the chemical abundances ratio at each stage of ionization depends oneffective temperatures and enhancement of abundances.
VL  - 5
IS  - 5
ER  -

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Author Information

Belay Sitotaw Goshu

Department of Physics, College of Natural and Computational Science, Dire Dawa University, Dire Dawa, Ethiopia

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APA Style

Belay Sitotaw Goshu. (2018). Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium. American Journal of Astronomy and Astrophysics, 5(5), 50-56. https://doi.org/10.11648/j.ajaa.20170505.11

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ACS Style

Belay Sitotaw Goshu. Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium. Am. J. Astron. Astrophys. 2018, 5(5), 50-56. doi: 10.11648/j.ajaa.20170505.11

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AMA Style

Belay Sitotaw Goshu. Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium. Am J Astron Astrophys. 2018;5(5):50-56. doi: 10.11648/j.ajaa.20170505.11

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@article{10.11648/j.ajaa.20170505.11,
  author = {Belay Sitotaw Goshu},
  title = {Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium},
  journal = {American Journal of Astronomy and Astrophysics},
  volume = {5},
  number = {5},
  pages = {50-56},
  doi = {10.11648/j.ajaa.20170505.11},
  url = {https://doi.org/10.11648/j.ajaa.20170505.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajaa.20170505.11},
  abstract = {A number of models were utilized to study hydrogen and helium ionization structure by assessing the impacts of effective temperatures by different scholars. But this work mainly focused on two temperatures, 35 000 K and 45 000 K and enhancement of abundances. Each model is characterized based on the solar abundances and enhanced abundances by scale factors of 5. The photoionization code cloudy was used to construct the model of the nebulae. The result revealed that at high temperature 45 000 K, the sphere of helium close to hydrogen whereas at low temperature 35 000 K, hydrogen ion ratio is more dominant than helium and its radius is greater than it. Moreover, the chemical abundances ratio at each stage of ionization depends oneffective temperatures and enhancement of abundances.},
 year = {2018}
}

Copy | Download

TY  - JOUR
T1  - Impacts of Chemical Abundances on Modeling Photoionization Case of Hydrogen and Helium
AU  - Belay Sitotaw Goshu
Y1  - 2018/01/19
PY  - 2018
N1  - https://doi.org/10.11648/j.ajaa.20170505.11
DO  - 10.11648/j.ajaa.20170505.11
T2  - American Journal of Astronomy and Astrophysics
JF  - American Journal of Astronomy and Astrophysics
JO  - American Journal of Astronomy and Astrophysics
SP  - 50
EP  - 56
PB  - Science Publishing Group
SN  - 2376-4686
UR  - https://doi.org/10.11648/j.ajaa.20170505.11
AB  - A number of models were utilized to study hydrogen and helium ionization structure by assessing the impacts of effective temperatures by different scholars. But this work mainly focused on two temperatures, 35 000 K and 45 000 K and enhancement of abundances. Each model is characterized based on the solar abundances and enhanced abundances by scale factors of 5. The photoionization code cloudy was used to construct the model of the nebulae. The result revealed that at high temperature 45 000 K, the sphere of helium close to hydrogen whereas at low temperature 35 000 K, hydrogen ion ratio is more dominant than helium and its radius is greater than it. Moreover, the chemical abundances ratio at each stage of ionization depends oneffective temperatures and enhancement of abundances.
VL  - 5
IS  - 5
ER  -

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