Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..632b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 247, Dec. 15, 1990, p. 632-646.
Astronomy and Astrophysics
Astronomy
28
Astronomical Photometry, Astronomical Spectroscopy, Eclipsing Binary Stars, Starspots, Diurnal Variations, Electrophotometry, Ephemerides, Light Curve, Radial Velocity
Scientific paper
New photometric and spectroscopic observations of the eclipsing binary AG Vir are presented. Medium-resolution spectroscopy has allowed the measurement of velocities for the secondary component for the first time. The V light curve shows many of the features seen in previous studies of this system. A full analysis of the spectroscopic and photometric data has been made which suggests that the system is either in a marginal state of conatact or a deep-contact configuration depending on the type of spot model invoked. AG Vir constitutes an excellent example of the expected manifestations of spot activity on a light curve. It also demonstrates the ease with which the spot phenomenon can be invoked to explain the appearance of a light curve and to provide conflicting results. This study shows the necessity of a more thorough investigation of this system using Doppler-imaging techniques and simultaneous infrared and optical photometry.
Bell Aaron S.
Hilditch Ron W.
Rainger P. P.
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