Physical Parameters and Chemical Composition in Abell 78

Details Physical Parameters and Chemical Composition in Abell 78 Physical Parameters and Chemical Composition in Abell 78

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000rmxac...9..234m&link_type=abstract

"Astrophysical Plasmas: Codes, Models, and Observations, Proceedings of the conference held in Mexico City, October 25-29, 1999,

Astronomy and Astrophysics

Astrophysics

Scientific paper

Physical parameters and chemical abundances were derived for different zones of A 78, from a high resolution spectroscopic study. The zones observed are the bright central knots and the outer hydrogen-rich shell. The knots contain an extremely hydrogen-deficient material and the composition of this zone is dominated by helium and heavy elements. The hydrogen-rich external shell appears to have normal helium abundance and very low metallicity. We conclude that the abundance determination is affected by the presence of large temperature fluctuations in the gas, due to additional heating mechanisms such as shocks by high speed ejecta and photoelectrons from dust grains.

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