Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..150l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 150-158.
Astronomy and Astrophysics
Astrophysics
30
D Lines, Interstellar Gas, Molecular Clouds, Nebulae, Solar Neighborhood, Star Distribution, H I Regions, Line Spectra, Radio Spectra, Sodium, X Ray Binaries
Scientific paper
This study presents new high-dispersion CCD spectra of sodium for eight program stars located in the direction of the high-latitude Draco molecular cloud (DMC). The derived lower distance limit of 180 pc above the Galactic plane was evaluated from nondetection of interstellar absorption lines of sodium at the Draco velocity in sight lines of B8-F0 type stars. This result is in agreement with former distance estimates from star counts as well as from UBV photometric extinction measurements. The existence of the most negative velocity components in spectra of the most distant stars suggests a more speculative distance estimate of 400-600 pc for the DMC. The present determination of a lower distance limit to the DMC from an interstellar absorption-line study supplements the few existing optical determinations of firm (upper) distance limits to other high-latitude molecular clouds.
Herbstmeier Uwe
Lilienthal Dietmar
Mebold Ulrich
Wennmacher Alexander
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