Spectroscopic Observations of the Eclipsing Binary V367 Cygni.

Abstract

view Abstract Citations (14) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectroscopic Observations of the Eclipsing Binary V367 Cygni. Heiser, Arnold M. Abstract A series of spectroscopic observations made in 1958 and 1959 of the 18.6-day eclipsing binary V367 Cygni have been analyzed for radial velocities and line intensities. V367 Cygni has a Lyrae-type light- curve and an observed shell-like spectrum which is characteristic of a gaseous stream surrounding the binary system. The radial velocities of the stellar component of the X 4481 line of Mg ii were used to determine a velocity-curve and a set of orbital elements. The radial velocities of the absorption lines due to the gaseous stream surrounding the stars were compared with similar observations gathered over the previous twelve years. A significant variation of the gamma velocity of the gaseous stream was found. The nature of the primary star is discussed. Evidence suggests that it is probably a very luminous early A-type star. A curve-of-growth analysis, using a Schuster-Schwarzschild approximation, leads to physical parameters for the gaseous material at a given time that are consistent with the observed spectral type of the gaseous stream. The motions of the material in the gaseous stream are discussed with respect to (a) the variability of the gamma velocity of the absorption lines of the gaseous material, (b) the observed changing asymmetries of the absorption lines at different times, and (c) the observed shortward (violet) components of some of these absorption lines. Publication: The Astrophysical Journal Pub Date: September 1961 DOI: 10.1086/147180 Bibcode: 1961ApJ...134..568H full text sources ADS | data products SIMBAD (1)