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    A study of interstellar Na I D absorption lines towards the Lupus molecular clouds

    Crawford, Ian (2000) A study of interstellar Na I D absorption lines towards the Lupus molecular clouds. Monthly Notices of the Royal Astronomical Society 317 (4), pp. 996-1004. ISSN 0035-8711.

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    Abstract

    Intermediate-resolution (60 000 ≤ R ≤ 120 000) observations of interstellar Na I lines towards 29 stars in the general direction of the Lupus molecular clouds (330° ≲ l ≲ 350°; 0° ≲ b ≲ 25°) are presented. Previously published spectra towards an additional seven stars are also included. Based on the Hipparcos distances to these stars, and the minimum distance at which strong interstellar Na I lines appear in the spectra, I obtain a distance of ∼150±10 pc to the Lupus molecular complex. While in agreement with a number of other independent estimates, this result is at odds with the value of 100 pc recently obtained by Knude & Høg from a Hipparcos-based study of interstellar extinction. A possible explanation for this discrepancy is discussed, and it is concluded that the value of 150±10 pc obtained here is to be preferred. In addition, these observations have some other implications for the structure of the interstellar medium in this direction, and these are briefly considered.

    Metadata

    Item Type: Article
    School: School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 13 Aug 2019 11:04
    Last Modified: 12 Feb 2021 07:19
    URI: https://eprints.bbk.ac.uk/id/eprint/28527

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