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    Detection of CaI and CH absorption at the velocity of the variable interstellar component towards κ Velorum

    Crawford, Ian (2002) Detection of CaI and CH absorption at the velocity of the variable interstellar component towards κ Velorum. Monthly Notices of the Royal Astronomical Society 334 (2), L33-L37. ISSN 0035-8711.

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    Abstract

    I report the detection of interstellar CaI and CH at the velocity of the previously reported variable absorption component towards κ Velorum (HD 81188). The very high spectral resolution (R≈ 900 000) has resolved the intrinsic line profiles, yielding a kinetic temperature of Tk= 190+170−150 K, and a line-of-sight tubulent velocity of vt= 0.26+0.08−0.13 km s−1, for the densest material. The CaI/Caii ratio implies a spatial density of nH≳ 103 cm−3, although this may considerably underestimate the density in the variable region itself. The CH column density suggests a path-length of ∼102 to 103 au, supporting suggestions that variable interstellar components such as this are formed in extended structures (sheets or filaments) aligned with the line of sight.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 06 Aug 2019 16:28
    Last Modified: 12 Aug 2019 18:01
    URI: http://eprints.bbk.ac.uk/id/eprint/28476

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