Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912007k&link_type=abstract
American Astronomical Society, 189th AAS Meeting, late abstracts, #120.07; Bulletin of the American Astronomical, Vol. 29, p. 73
Astronomy and Astrophysics
Astronomy
Scientific paper
The eclipsing binary system RT Lacertae is not well understood. Its photometric light curves exhibit variations such as a migrating sinusoidal distortion wave similar to that seen in RS CVn-like systems, but RT Lac is certainly more complicated than most of those systems. Previous work revealed evidence of a transient stream and accretion material in the system, suggestive of Algols, although the light curves more closely resemble those of beta Lyrae systems. Possible mass exchange and accretion disks, scattering shells, highly active components, stellar pulsation, and large-scale stellar spotting have all been proposed as contributors to the light curve and spectral variations. New differential UBVRI photometry has been carried out of the system with the RADS photometry system on the 41-cm telescope of the University of Calgary Rothney Astrophysical Observatory between July and October,1996. 1004 observations in each passband and 15 new times of minimum were obtained. The light curves are dominated by a strong O'Connell effect (an asymmetry in brightness outside eclipse), with the brightness at first quadrature exceeding that at the second (mI-mII <0 in all passbands). The primary minimum is deeper than the secondary for all filters except U, in which the reverse is true; and U-B and B-V continue to be bluer at primary minimum, as in the past. Infrared data are now being sought to further aid interpretation. Computer modelling of the light curves of this system is being performed with University of Calgary's improved version of the Wilson-Devinney binary light curve analysis program. This may reveal a comprehensive model for the system, and resolve the controversy surrounding the light curve variations. This work had been supported by the U of C. Dept. of Physics & Astronomy and by NSERC of Canada operating and equipment grants to EFM.
Kijewski K. E.
Milone Eugene F.
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