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The short-period end of the contact binary period distribution based on the All-Sky Automated Survey
The search volume-corrected period distribution of contact binaries ofthe W UMa type appears to reflect primarily the constant number ratio of~=1/500 to the number of stars along the main sequence; there exist noevidence for angular momentum evolution. The maximum in contact binarynumbers is located at shorter periods than estimated before, P ~= 0.27d. The drop in numbers towards the cut-off at P ~= 0.215-0.22 d stillsuffers from the small number statistics while the cut-off itselfremains unexplained. Only one out of seven short-period All-SkyAutomated Survey variables with P < 0.22 d have been retained in thesample considered here within 8 < V < 13; this short-periodfield-sky record holder at P = 0.2178 d should be studied.
| A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.
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