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    A VAPID analysis of interstellar lithium in the ζ Oph sightline

    Howarth, I.D. and Price, R.J. and Crawford, Ian and Hawkins, H. (2002) A VAPID analysis of interstellar lithium in the ζ Oph sightline. Monthly Notices of the Royal Astronomical Society 335 (2), pp. 267-274. ISSN 0035-8711.

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    We present observations of the Li i 6708 Å doublet in the ζ Oph sightline, obtained at a resolution of ∼106 and a signal-to-noise ratio of ∼1200, together with supplementary observations of K iλ7699 and the Na iλ3302 doublet. These observations marginally resolve the main ‘−15 km s−1’ system into its two principal clouds; we model the data using standard physical assumptions, but in a statistically rigorous manner, taking fully into account the hyperfine, doublet and isotopic structure for each species, in each cloud, using a new code, vapid. The average 7Li/6Li ratio determined in this sightline is 1.12±0.20 dex (68 per cent confidence interval), in excellent agreement with the solar-system (meteoritic) value. The ratios in the individual clouds are determined with less precision, but are also consistent with the solar-system value, as is the total lithium abundance (with little evidence for depletion). The thermal and ‘turbulent’ broadening in the two clouds is discussed on the basis of observed line widths.


    Item Type: Article
    School: School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 12 Aug 2019 09:09
    Last Modified: 12 Aug 2019 09:09


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