Temperature Fluctuations, H II Region Abundances, and Primordial Helium

Details Temperature Fluctuations, H II Region Abundances, and Primordial Helium Temperature Fluctuations, H II Region Abundances, and Primordial Helium

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ssrv...84...95s&link_type=abstract

Space Science Reviews, v. 84, Issue 1/2, p. 95-103 (1998).

Physics

Temperature Fluctuations, H Ii Region Abundances, Primordial Helium

Scientific paper

There is evidence for temperature fluctuations in Planetary Nebulae and in some Galactic H II regions. If such fluctuations occur in the low metallicity, extragalactic H II regions used to probe the primordial helium abundance, the derived 4He mass fraction, YP, could be systematically different from the true primordial value. Although this effect could be large, there are no data which allow us to estimate the size of the temperature fluctuations for the extragalactic H II regions. Therefore, we have explored this effect via Monte Carlo simulations of the data in which the abundances derived from a fiducial data set are modified by DeltaT chosen from a distribution with 0 <= DeltaT <= DeltaTmax where DeltaTmax is varied from 500 K to 4000 K.

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