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UBV Photometry of the Massive Eclipsing Binary TT Aur
UBV observations of the massive binary system TT Aur were carried outmainly at the Turkish National Observatory (TUG). These observations,together with IUE spectra and times of eclipse minima collected from theliterature, were used to study the system parameters. Simultaneoussolution of the light curves by the Wilson-Devinney code allows asemi-detached configu-ration with a slightly larger Roche-lobe fillingsecondary. This picture is supported by other evidence. The shoulders ofthe primary minimum suggest some excess absorption, in keeping withcircumstellar material in the form of a disk-like structure around theprimary component. The deeper primary minimum in the U filter mayindicate a hotter region on the secondary-facing hemisphere of theprimary. The period variation of the system can also be related to thepossible existence of a third component in a circular orbit around thesystem. An alternative detached representation is also considered usingoptimal curve-fitting techniques. We appeal for further observations tohelp resolve some outstanding issues in this interesting massive binary.
| UBV beta Database for Case-Hamburg Northern and Southern Luminous Stars
A database of photoelectric UBV beta photometry for stars listed in theCase-Hamburg northern and southern Milky Way luminous stars surveys hasbeen compiled from the original research literature. Consisting of over16,000 observations of some 7300 stars from over 500 sources, thisdatabase constitutes the most complete compilation of such photometryavailable for intrinsically luminous stars around the Galactic plane.Over 5000 stars listed in the Case-Hamburg surveys still lackfundamental photometric data.
| Discovery of an Eclipsing Binary Star in Auriga
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| 2000 A UV imaging of a 6 deg diameter field around MU Aurigae
UV imagery of a 6 deg diameter field centered on Mu Aurigae in thegalactic plane was obtained with the SCAP 2000 experiment dedicated toan UV sky survey. Photometric UV magnitudes at 2000 A are given here formore than 500 stars detected in the field. A star-counting method isapplied to give a fine description of the interstellar matterdistribution up to 1000 pc. The mean space density for B8-A3 stars isderived. Stars with an UV excess are detected and spectralreclassification of some single or binary stars is suggested.
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