BIROn - Birkbeck Institutional Research Online

    High resolution observations of interstellar CH and CH+ towards the Scorpius OB1 association

    Crawford, Ian (1989) High resolution observations of interstellar CH and CH+ towards the Scorpius OB1 association. Monthly Notices of the Royal Astronomical Society 241 (3), pp. 575-594. ISSN 0035-8711.

    [img]
    Preview
    Text (Refereed)
    High resolution observations of interstellar CH and CH+ towards the Scorpius OB1 association.pdf - Published Version of Record

    Download (399kB) | Preview

    Abstract

    High-resolution observations (⁠λ/Δλ=105⁠) of interstellar CH and CH+ towards nine stars in the Sco OB1 association are presented. Several velocity components were observed towards most stars and these are interpreted to arise in foreground diffuse molecular clouds. Three distinct types of absorption component were found: components present in both CH and CH+, components present in CH+ only, and components present in CH only. Possible origins for these three classes of component are discussed. Although shock models are generally thought to be necessary for the production of CH+ in interstellar clouds, it was found that, for those components observed in both species, the very small velocity differences observed between them (⁠≲0.9km s−1⁠) correspond to shock velocities that are too small for significant CH+ production. However, on the basis of published shock models, it is suggested that the components observed in CH+ alone may arise in shocked low-density clouds with only a small fractional abundance of molecular hydrogen.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 19 Aug 2019 16:41
    Last Modified: 22 Aug 2019 04:17
    URI: http://eprints.bbk.ac.uk/id/eprint/28644

    Statistics

    Downloads
    Activity Overview
    77Downloads
    30Hits

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item