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Galactic distribution of Cepheids between l of approximately 294 and 331 degPrevious 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.
Document ID
19790044845
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Grayzeck, E. J.
Date Acquired
August 9, 2013
Publication Date
March 1, 1979
Publication Information
Publication: Astronomical Journal
Volume: 84
Subject Category
Astrophysics
Accession Number
79A28858
Funding Number(s)
CONTRACT_GRANT: NSG-398
CONTRACT_GRANT: NSF GP-27503
CONTRACT_GRANT: NSF GP-18626
Distribution Limits
Public
Copyright
Other

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