WHAT IS THE PROBLEM WITH HE-3

被引:57
作者
OLIVE, KA
ROOD, RT
SCHRAMM, DN
TRURAN, J
VANGIONIFLAM, E
机构
[1] UNIV VIRGINIA,DEPT ASTRON,CHARLOTTESVILLE,VA 22903
[2] UNIV CHICAGO,CHICAGO,IL 60637
[3] INST ASTROPHYS,F-75014 PARIS,FRANCE
[4] FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510
关键词
GALAXY; EVOLUTION; ISM; ABUNDANCES; NUCLEAR REACTIONS; NUCLEOSYNTHESIS;
D O I
10.1086/175640
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider the galactic evolutionary history of He-3 in models which deplete deuterium by as much as a factor of 2 to similar to 15 from its primordial value to its present-day observed value in the interstellar medium (ISM). We show that when 3He production in low-mass stars (1-3 M(.)) is included over the history of the galaxy, He-3 is greatly overproduced and exceeds the inferred solar values and the abundances determined in galactic H II regions. Furthermore, the ISM abundances show a disturbing dispersion which is difficult to understand from the point of view of standard chemical evolution models. In principle, resolution of the problem may lie in either (1) the calculated He-3 production in low-mass stars; (2) the observations of the He-3 abundance; or (3) an observational bias toward regions of depleted He-3. Since He-3 observations in planetary nebula support the calculated He-3 production in low-mass stars, option (1) is unlikely. We will argue for option (3) since the He-3 interstellar observations are indeed made in regions dominated by massive stars in which He-3 is destroyed. In conclusion, we note that the problem with He-3 seems to be galactic and not cosmological.
引用
收藏
页码:680 / 685
页数:6
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