Spectrum variability of 68 Cygni, an O(f) star at the center of a ring nebula

Details Spectrum variability of 68 Cygni, an O(f) star at the center of a ring nebula Spectrum variability of 68 Cygni, an O(f) star at the center of a ring nebula

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sval....8..386a&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Dec. 1982, p. 717-721) Soviet Astronomy Letters (ISSN 0360-0327), vol. 8, Nov.-Dec.

Astronomy and Astrophysics

Astronomy

13

Nebulae, O Stars, Stellar Spectra, Variable Stars, Absorption Spectra, Binary Stars, Line Spectra, Periodic Variations, Radial Velocity, Spectral Energy Distribution, Spectral Line Width, Spectrograms, Spectrum Analysis, Stellar Mass

Scientific paper

Spectrograms of the type O(f) star 68 Cyg, centered in a ring nebula, have been analyzed. Both the radial velocities (K approximately 30 km/sec) and the equivalent widths of the absorption lines show a 5.1/d periodicity (W-lambda amplitude, approximately 30 percent). The star is classed as O7(f) V. Perhaps 68 Cyg is a close binary whose 30 solar masses primary has a low-mass (approximately 3 solar masses) companion.

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