The instability strip of the anomalous Cepheids in the Draco dwarf spheroidal galaxy

Abstract

view Abstract Citations (22) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The instability strip of the anomalous Cepheids in the Draco dwarf spheroidal galaxy. Deupree, R. G. ; Hodson, S. W. Abstract The instability strip of the anomalous Cepheids is located, and the location verifies that the variables must be more massive than the RR Lyrae variables. It is found that the red edge of the Population II instability strip becomes bluer as the stellar mass increases, as does the blue edge. This indicates that our previous RR Lyrae color-width results are effectively independent of mass. The changes in the anomalous Cepheid instability strip indicated by a new opacity table, whose prime improvement is the inclusion of a number of molecules, and by the hypothesis that the helium abundance in the Draco system is slightly less than in the Galaxy, are examined. Subject headings: clusters: globular - galaxies: individual - stars: horizontal branch - stars: interiors - stars: pulsation - stars: RR Lyrae Publication: The Astrophysical Journal Pub Date: December 1977 DOI: 10.1086/155721 Bibcode: 1977ApJ...218..654D Keywords: Cepheid Variables; Galactic Clusters; Globular Clusters; Star Distribution; Stellar Luminosity; Stellar Mass; Stellar Models; Stellar Structure; Astrophysics full text sources ADS | data products NED (1)