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HYDROGEN COLUMN DENSITY EVALUATIONS TOWARD CAPELLA: CONSEQUENCES ON THE INTERSTELLAR DEUTERIUM ABUNDANCE

机译:朝向小舟的氢柱密度评估:星际氘丰度的结果

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The deuterium abundance evaluation in the direction of Capella has for a long time been used as a reference for the local interstellar medium (ISM) within our Galaxy. We show here that broad and weak H Ⅰ components could be present on the Capella line of sight, leading to a large new additional systematic uncertainty on the N(H Ⅰ) evaluation. We find the D/H ratio toward Capella to be equal to 1.67(+- 0.3) x 10~(-5) with almost identical χ~2 for all the fits (this range includes only the systematic error; the 2 σ statistical one is almost negligible in comparison). We conclude that D/H evaluations over H Ⅰ column densities below 10~(19) cm~(-2) (even perhaps below 10~(20) cm~(-2) if demonstrated by additional observations) may present larger uncertainties than previously anticipated. We mention that the D/O ratio might be a better tracer for D Ⅰ variations in the ISM as recently measured by the Far Ultraviolet Spectroscopic Explorer.
机译:长期以来,沿Capella方向进行的氘丰度评估一直用作我们银河系中本地星际介质(ISM)的参考。我们在这里表明,Capella视线中可能存在宽而弱的HⅠ分量,从而导致N(HⅠ)评估出现了新的较大的系统不确定性。我们发现Capella的D / H比等于1.67(+-0.3)x 10〜(-5),所有拟合几乎都等于χ〜2(该范围仅包括系统误差; 2σ统计值之一相比之下几乎可以忽略不计)。我们得出的结论是,在HⅠ柱密度低于10〜(19)cm〜(-2)的情况下进行D / H评估(如果另外观察,甚至可能低于10〜(20)cm〜(-2))可能会比先前的预期。我们提到,D / O比可能是ISM中DⅠ变化的更好示踪剂,最近由远紫外光谱浏览器测量到。

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