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- W2049281302 abstract "view Abstract Citations (27) References (35) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A comparison of variable and nonvariable stars in the cepheid strip. Schmidt, E. G. ; Rosendhal, J. D. ; Jewsbury, C. P. Abstract Spectra of three Cepheids (RX Aur, X Cyg, and T Mon) and 11 nonvariable supergiants are analyzed. Additional evidence is presented for the presence of nonvariables within the Cepheid strip. Temperatures determined from Ha line profiles and broad-band photometry were used together with model atmospheres and line strengths from the spectra to determine the gravities, turbulent velocities, and element abundances. The gravities of the Cepheids appear to be lower than for the nonvariables at the same luminosity while the turbulent velocities are higher. No differences of significance are found in the element abundances. The gravity differences can be explained either in terms of mass loss in the Cepheids or very low helium abundance in the nonvariables. The former interpretation fails to explain why some Cepheid-strip stars do not vary while the latter raises problems in connection with the origin of the elements. If we assume that pulsation causes some mass loss, a more consistent picture emerges in which only moderate helium deficiencies are required in the nonvariables. Subject headings: abundances, stellar - atmospheres, stellar - Cepheids and W Virginis stars - pulsation Publication: The Astrophysical Journal Pub Date: April 1974 DOI: 10.1086/152803 Bibcode: 1974ApJ...189..293S full text sources ADS | data products SIMBAD (14)" @default.
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- W2049281302 date "1974-04-01" @default.
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- W2049281302 title "A comparison of variable and non-variable stars in the cepheid strip." @default.
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