Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98....9a&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 1, May 1981, p. 9-14.
Astronomy and Astrophysics
Astrophysics
9
Interstellar Gas, Kinematics, Radial Velocity, Spiral Galaxies, Stellar Motions, Calcium, Early Stars, H Lines, Line Spectra
Scientific paper
Radial-velocity data for young stars and interstellar gas situated along the inner border of the Carina spiral arm have been studied. In a number of stellar groups the member stars display radial velocities with small internal dispersions. Interstellar-line velocities have been discussed, mainly for Ca II and H II. Out to a distance from the sun of approximately 3.5 kpc there are four components of interstellar Ca II, all of them well-defined. The second-strongest component is matched by the only H II component that can be readily identified. The radial-velocity pattern of interstellar gas closely follows that predicted by a rotational model. Out to a distance of approximately 2 kpc the stellar groups also follow the model-velocity pattern quite well. Beyond that distance and out to about 4 kpc, the stellar groups show pronounced positive velocity residuals. Stars at even larger distances again appear to follow model velocities.
Ardeberg Arne
Maurice Eric
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