Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714405t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #144.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Data from the International Ultraviolet Explorer (IUE) archive was utilized in the analysis of the Algol type eclipsing binary star system U Cephei (HD 5679). The U Cep system consists of a B7V primary star and G8IV secondary that is actively transferring mass to the primary. A total of 115 spectral images from the IUE archive were analyzed, with special attention given to the 29 images taken during a complete period of 2.5 days. Synthetic spectra generated via TLUSTY and SYNSPEC were used, along with comparison spectra from the standard star Regulus, to determine continuum flux levels, light curves, and radial velocities for the system. Observations of non-photospheric absorption features suggest a transient outward matter flow present in the early observed phases of 0.48 to 0.69, but the same features are significantly reduced in the same phases one period later. Additionally, simulated spectra suggest absorption features previously thought to be high energy Si IV and C IV lines may in fact be anomalous convolutions of different ionic species at lower temperatures.
DeLeo G. G.
McCluskey George E. Jr.
Tupa Peter R.
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