Computer Science
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982msngr..30...18g&link_type=abstract
ESO Messenger, Dec. 1982, p. 18-20.
Computer Science
Chemical Composition, H Alpha Line, High Dispersion Spectrographs, Peculiar Stars, Stellar Atmospheres, Stellar Spectra, Atmospheric Composition, Binary Stars, Helium, Metallic Stars, Spectrum Analysis
Scientific paper
The determination of the elemental composition of the atmospheres of chemically peculiar (CP) stars by spectroscopic analysis of the H-alpha lines is discussed. CP stars are classified into He-strong, He-weak, Hg-Mn, Bp including the Si 4200 A line, Ap, and metallic line stars. The atmospheres of CP stars are slowly rotating and have a magnetic field. The H-alpha profile of the He-weak star HD 90264, a double-line spectroscopic binary, has indicated that the slow rotation is due to a tidal interaction between the stars, a feature which is not probable for CP stars. HD 92064 was found to be a spectral type B5 or B6V from ubvy analysis. H-alpha observations indicate an effective temperature of 17,000 K for both stars, which have similar mass and luminosity. Further studies with coude spectrographs are recommended to determine if HD 90264 is in fact a CP star.
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