Radial velocities of the Cepheid X Cygni

Details Radial velocities of the Cepheid X Cygni Radial velocities of the Cepheid X Cygni

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..309a&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, June-July 1978, p. 309-311.

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12

Cepheid Variables, Radial Velocity, Stellar Spectrophotometry, Line Spectra, Phase Shift, Stellar Spectra

Scientific paper

A radial-velocity curve based on 17 coude spectra shows the following results when compared with other velocities: (1) no variation in mean velocity, implying no detectable companion; (2) no phase shifts if a period of 16.3861 days is used, indicating a constant period; (3) probably no variation in the shape of the velocity curve except perhaps at phases 0.55-0.80. Strong lines show a greater expansion by roughly one atmospheric scale height than moderate-strength lines, but it is not clear whether they show a similar greater contraction.

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