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25 April 2024

» arxiv » astro-ph/0310421

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Systematic effects and a new determination of the primordial abundance of 4He and dY/dZ from observations of blue compact galaxies
Y. I. Izotov ; T. X. Thuan ;
Date:	15 Oct 2003
Journal:	Astrophys.J. 602 (2004) 200-230
Subject:	astro-ph
Affiliation:	Main Astronomical Observatory, Kyiv, Ukraine, University of Virginia, Charlottesville, USA
Abstract:	We use spectroscopic observations of a sample of 82 HII regions in 76 blue compact galaxies to determine the primordial helium abundance Yp and the slope dY/dZ from the Y-O/H linear regression. To improve the accuracy of the dY/dZ measurement, we have included new spectrophotometric observations of 33 HII regions which span a large metallicity range, with oxygen abundance 12+log(O/H) varying between 7.43 and 8.30 (Zsun/30
Source:	arXiv, astro-ph/0310421
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