Spectroscopic investigation of the peculiar binary V 389 CYG

Details Spectroscopic investigation of the peculiar binary V 389 CYG Spectroscopic investigation of the peculiar binary V 389 CYG

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....68..437g&link_type=abstract

Astronomy and Astrophysics, vol. 68, no. 3, Aug. 1978, p. 437-441.

Astronomy and Astrophysics

Astrophysics

4

Binary Stars, Orbital Elements, Radial Velocity, Stellar Spectra, A Stars, Abundance, B Stars, Line Spectra

Scientific paper

60 spectrograms have been obtained at the Hoher List Observatory for an investigation of the peculiar spectroscopic binary V 389 Cyg. The spectrum of the single-line binary shows enhanced Si II lines so that the star can be classified as a silicon B 9p star. The period found earlier by Young (1921) and Guthnick (1938) is improved to 3.313168 + or - 0.000008 days. New orbital elements are derived. The unusually large scatter around the radial velocity curve can be attributed to a variable center-of-mass velocity resulting from a revolution about a third unseen component with the period of 154.09 + or - 0.02 days. The elements of the long-period orbit are determined. Additional peculiarities which seem to be present in Guthnick's spectroscopic data and which have been interpreted by him as delta Cephei-like variability have not been recognized in our data.

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