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    Ultra-high-resolution observations of Ca+ ions in the local interstellar medium

    Crawford, Ian and Dunkin, S.K. (1995) Ultra-high-resolution observations of Ca+ ions in the local interstellar medium. Monthly Notices of the Royal Astronomical Society 273 (1), pp. 219-224. ISSN 0035-8711.

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    We present ultra-high-resolution (0.3 km s-1 FWHM) spectra of the interstellar Ca K line towards the nearby starsα Oph, α Gru and α Eri. These are the highest resolution absorption-line spectra yet obtained of clouds located within the local interstellar bubble. They have enabled us to resolve the line profiles fully, and reveal structure within components which have, until now, been considered as arising in single clouds. The velocity dispersions (b-values) of the identified components all have well-determined values in the range 1.4-2.3 km s-1, consistent with thermal broadening at temperatures in the range 5000-13 000 K.


    Item Type: Article
    School: School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 13 Aug 2019 15:17
    Last Modified: 09 Jun 2021 13:43


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