Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49..179c&link_type=abstract
Astrophysics and Space Science, vol. 49, no. 1, June 1977, p. 179-197. Research supported by the Consiglio Nazionale delle Rice
Astronomy and Astrophysics
Astrophysics
11
Eclipsing Binary Stars, Radial Velocity, Stellar Luminosity, Stellar Spectra, Supergiant Stars, Balmer Series, F Stars, H Alpha Line, Spectroscopic Analysis, Spectrum Analysis, Tables (Data)
Scientific paper
Eighteen spectrograms of the eclipsing binary Epsilon Aurigae are analyzed which were obtained with a dispersion of 7.5 A/mm at two successive epochs corresponding to phases far from the last eclipse, which occurred in 1955-57. Many blended and unblended lines of a typical F supergiant are observed, equivalent widths are determined, and the spectral variations are described. The profiles of nearly all the strongest lines are found to be slightly asymmetric, with a sharp red edge and a violet wing. A mean Balmer discontinuity of 0.58 is measured in four spectra, a mean central depth of about 0.83 is estimated for the strongest lines, a mean velocity of 33.83 km/s is computed for a number of unblended lines, and mean radial velocities of -5.2 and -4.8 km/s, respectively, are derived for the two epochs. It is concluded that the primary component of Epsilon Aurigae is a supergiant exhibiting very irregular variations due to physical phenomena of unknown nature.
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