The behavior of H-alpha in Delta Cephei

Details The behavior of H-alpha in Delta Cephei The behavior of H-alpha in Delta Cephei

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..772w&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Dec. 1979-Jan. 1980, p. 772-774.

Astronomy and Astrophysics

Astronomy

18

Cepheid Variables, H Alpha Line, Radial Velocity, Stellar Spectra, Emission Spectra, Velocity Distribution

Scientific paper

A new radial velocity curve for Delta Cep is presented based on 10 A/mm red spectrograms. The curves for neutral metallic lines, low excitation ions, and high excitation Si II lines follow the curve of Shane (1958) within observational uncertainties. For H-alpha the curve shows an amplitude 15 km/s larger than for the metallic lines. Arguments are presented to show that the H-alpha absorption is formed high in the atmosphere of Delta Cep.

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