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- W1970789050 abstract "view Abstract Citations (8) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stellar pulsations and the abundance of helium. Schmidt, E. G. Abstract A study is made of the stellar pulsation and helium abundance of clusters containing Cepheid-strip stars. Specifically, spectra are obtained of the main-sequence B stars in the NGC 129 cluster (containing a nonvariable Cepheid-strip star), and the M25 cluster (containing a relatively hot Cepheid). It is suggested that the intrinsic helium abundances are not the source of the appearance of nonvariables in the Cepheid strip. And, if helium abundance is involved, a diffusion mechanism in the driving regions of the envelopes of Cepheid-strip stars must be present. In NGC 129, two stars are observed to yield a normal helium abundance, whereas in M25, all of the stars observed have abnormally low abundances. The significance of these low abundances is not clear. Publication: The Astrophysical Journal Pub Date: January 1978 DOI: 10.1086/155812 Bibcode: 1978ApJ...219..543S Keywords: Cepheid Variables; Helium; Hot Stars; Stellar Evolution; Stellar Spectra; A Stars; Abundance; B Stars; M Stars; Star Clusters; Stellar Envelopes; Stellar Gravitation; Stellar Luminosity; Stellar Spectrophotometry; Ubv Spectra; Astrophysics; Cepheids:Galactic Clusters; Cepheids:Helium full text sources ADS |" @default.
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- W1970789050 date "1978-01-01" @default.
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- W1970789050 title "Stellar pulsation and the abundance of helium" @default.
- W1970789050 doi "https://doi.org/10.1086/155812" @default.
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