1997/11/27 by B. E. J. Pagel, L. Portinari · 3 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Atomic physics #Function (biology) #Gamma-ray bursts and supernovae #Helium #Initial mass function #Main sequence #Physics #Sequence (biology) #Star formation #Stars #Stellar evolution #Stellar mass #Stellar, planetary, and galactic studies #Supernova #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.1998.01637.x
6 pages (MNRAS LaTeX macro) and 4 figures (EPS) submitted to MNRAS November 1997
arxiv created 1997/11/27 · openalex publication_date 1998/08/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The slope ΔY/ΔZ 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 ΔY/ΔZ from fine structure in the main sequence of nearby stars from Hipparcos data for stars with Z ≤ Z⊙. We 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 initial mass function slope adopted.