Other
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..329g&link_type=abstract
Astronomical Journal, vol. 84, Mar. 1979, p. 329-335.
Other
2
Centaurus Constellation, Cepheid Variables, Galactic Structure, Milky Way Galaxy, Star Distribution, Galactic Rotation, Gas Dynamics, Hydrogen Clouds, Radial Velocity, Star Clusters, Stellar Models, Stellar Motions
Scientific paper
Previous observations of long-period Cepheids in the Crux-Centaurus-Circinus-Norma (CCCN) region (bounded by galactic longitudes of approximately 294 and 331 deg) are used to delineate spiral features that are consistent with available data for other spiral tracers, especially H I gas. The galactic distribution of the long-period Cepheids in the CCCN region is examined, and a possible interpretation of the spiral structure as viewed in the CCCN region is suggested. Specifically, it is concluded that: (1) the region that is often called the Centaurus link contains no Cepheids with periods longer than 11.25 days and may be part of a spiral feature characterized by older Population I material; (2) long-period Cepheids at large distances (4 kpc) are concentrated near 307 deg galactic longitude and are probably associated with the 'inner arm' identified by Kraft (1965); and (3) the velocities of the observed Cepheids differ significantly from the predictions of the Schmidt (1965) model.
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