IUE & Voyager Observations of the Early Type Contact Systems SX AUR, BF AUR and SV CEN

Details IUE & Voyager Observations of the Early Type Contact Systems SX AUR, BF AUR and SV CEN IUE & Voyager Observations of the Early Type Contact Systems SX AUR, BF AUR and SV CEN

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1869p&link_type=abstract

IUE Proposal ID #IBGGP

Computer Science

Scientific paper

Combining spectroscopic and photometric line and continuum data from IUE, the Voyager UVS, and ground based telescopes we propose a detailed comparative study of the early type contact binaries SX Aur, BF Aur, and SV Cen. We plan to determine the extent of the mass and angular momentum loss in SX Aur and BF Aur and compare this with that observed in SV Cen. In addition we will look for phase dependent mass loss and secular variability in the mass flow in all three systems. Based upon their published UV flux values, SX Aur and BF Aur may show a 200,OOOK, localized 'Continuum source as does SV Cen. We will-investigate this possibility and, if found, locate it in phase. Also planned is an abundance study of the stars and their circumstellar matter and a search for the presence of photospheric pulsations. Finally, light curve solutions will be produced from the combined IUE and Voyager photometry, which will provide uninterrupted flux data from 900 - 3000A, and the ground-based photometry. The extended wavelength coverage provided by IUE and Voyager will allow us to determine quite accurately the temperatures of any hot circumstellar components as well as photospheric conditions in the stars since these early type systems radiate most of their flux in the extreme-far UV. The observation plan is to alternate high and low dispersion exposures using both cameras and obtain all data within two orbital periods.

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