ΔY/ΔZ from fine structure in the main sequence based on Hipparcos parallaxes

被引：96

作者：

Pagel, BEJ

Portinari, L

机构：

[1] NORDITA, DK-2100 Copenhagen O, Denmark

[2] Dipartimento Astron, I-35122 Padua, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1998年 / 298卷 / 03期

关键词：

stars; abundances; evolution; ISM; galaxies;

D O I：

10.1046/j.1365-8711.1998.01637.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 less than or equal to Z.. We find a value of about 3, which is consistent with what has been found in extragalactic Ii rr regions and with stellar models for suitable upper limits to the initial masses of supernovae according to the initial mass function slope adopted.

引用

页码：747 / 752

页数：6

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