Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....41..403r&link_type=abstract
Astronomy and Astrophysics, vol. 41, no. 3-4, July 1975, p. 403-408.
Astronomy and Astrophysics
Astrophysics
6
Astronomical Spectroscopy, Galactic Structure, Hydrogen Clouds, Interstellar Gas, Velocity Distribution, Absorption Spectra, Astronomical Models, Atomic Spectra, Calcium, H Lines, K Lines, Milky Way Galaxy, Radial Velocity, Spectrum Analysis
Scientific paper
The velocity field of the interstellar gas is examined in the 345-28 deg galactic longitude interval by means of Ca II K lines in high dispersion spectra. The radial velocities of the K lines are compared with 21-cm self-absorption velocities in both dark clouds (Knapp, 1972) and the extended feature mapped by Riegel and Crutcher (1972). Evidence is presented to show that the extended +7 km/sec feature is more distant than 500 pc. Two current hypotheses about the structure of the local gas near the sun, one based upon a ring of expanding matter, the other being a linear density-wave perturbation, are compared with the observations. The expanding ring model is in better agreement with the observed K-line velocities.
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