DY/DZ from fine structure in the Main Sequence based on Hipparcos parallaxes
Astrophysics
2009-10-30 v1
Abstract
The slope Delta Y/Delta Z is a quantity of interest in relation to stellar evolution, the initial mass function and the determination of the primordial helium abundance. In this paper we estimate Delta Y/Delta Z from fine structure in the Main Sequence of nearby stars from Hipparcos data for stars with Z \leq Zsun and find a value of about 3, which is consistent with what has been found in extragalactic H II regions and with stellar models for suitable upper limits to the initial masses of supernovae according to the IMF slope adopted.
Keywords
Cite
@article{arxiv.astro-ph/9711332,
title = {DY/DZ from fine structure in the Main Sequence based on Hipparcos parallaxes},
author = {B. E. J. Pagel and L. Portinari},
journal= {arXiv preprint arXiv:astro-ph/9711332},
year = {2009}
}
Comments
6 pages (MNRAS LaTeX macro) and 4 figures (EPS) submitted to MNRAS November 1997