Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0330w&link_type=abstract
American Astronomical Society, AAS Meeting #211, #03.30; Bulletin of the American Astronomical Society, Vol. 39, p.728
Other
Scientific paper
The International Ultraviolet Explorer (IUE) archive of high-resolution UV spectra of the eclipsing semi-detached binary star, Algol (β Persei, HD 19356), taken from Sept. 1978 to Sept. 1989, is analyzed in order to characterize the phase- and epoch-dependent movement of gas within and from this system. Method One. 103 continuum curves (59 SWP, 44 LWP/LWR) using 2279 continuum flux estimates ( 50 Å intervals), and 46 light curves using the 1647 large aperture (LA) continuum level measurements demonstrate the expected (from blackbody considerations) wavelength and phase dependencies of the continuum flux due to the periodic occultation of the hotter primary, Algol A, by its cooler companion, Algol B. (The 632 nonphotometric small aperture continuum estimates are not suitable for light curves and are discussed.) An unexpected secondary minimum is identified as a gas-streaming effect, the eclipse of a localized hot region between the two components. Method Two. A differential intercomparison of normalized LA light curves and continua reveals additional phase- and epoch-dependent gas-streaming effects otherwise inadvertently washed out in Method One. 75 synthetic continua without gas-stream effects are constructed from a grid of normalized synthetic light curves (Binary Maker 3) and compared to the differentially normalized LA observations. A variable photometric distortion at 1600 Å (between 1525-1725 Å) in the form of a depression reaches 8-10% in Epoch 1989 at phases 0.189, 0.545, 0.778, and 0.881. This time-dependent feature may be explained as line blanketing due to varying column densities of cool 5,000-6,000 K circumstellar gas as the line of sight or activity level changes. The series limits of Mg I, Si I, and Fe I may contribute to the depression as well as blends from Fe II and C I. Preliminary simulations using CLOUDY indicate that Magnesium is the main contributor. (Spectroscopic analyses including "difference spectra” are presented as well.)
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