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TYC 303-633-1


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The observed periods of AP and BP stars
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First supplement to the catalog of observed periods of AP stars
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A photoelectric light curve of AX Virginis has been obtained based on686 single observations in yellow light. The outside eclipse light curvewas fitted with a finite Fourier series, and the least squares solutionfor the coefficient and their probable errors are shown. The shape ofthe curve inside eclipses indicates that the eclipses are partial. TheRussell-Merrill method is used to solve for the orbital elements. Theresults show that the stars strongly depart from the similar, rotationalellipsoids assumed in the method, and that the darker (due to gravitydarkening) component is much more distorted than the brighter one.

Two almost-contact semidetached systems - ZZ Aurigae and AX Virginis
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Analysis of 11 Late-Type Close Binary Systems
This is a preliminary report on the joint research project between 3observatories: Beijing, Yunnan, and Behlen Observatories from China andthe United States. The systems we have been dealing with are primary oflate spectral types and with short periods. Most of the observationswere secured from the observatories in China. The computational analysisis carried out in University of Nebraska, Lincoln. The photometricsolutions are based on the Wilson and Devinney method. Out of 11 systemsanalyzed 6 of them: AO Cam, ER Ori. BX Peg, BB Peg, U Peg, and SW Lacare found to be contact systems. All of them are having their primaryeclipses at occultation. Therefore they can be classified as W-type W UMa systems. They also show other W-type characteristics. Three systems:ZZ Aur, RZ Dra, and AX Vir are found to be semi-detached systems, withlow mass components filling their Roche surfaces. The massive componentsare having their radii fairly close to Roche surfaces and are largerthan their contact companions. The last two systems: AT Cam and AZ Camare found to be detached systems, but with their low mass componentsalmost filling their Roche surfaces. This type of configuration is ofgreat interest to our understanding of close binary evolution. Webelieve that these systems are at phase immediately after the normalAlgol phase, where the mass lossing components detached from the Rochesurfaces at the conclusion active mass lost phase.

Statistics of categorized eclipsing binary systems Lightcurve shapes, periods, and spectral types
The statistics of the light curve morphologies, eclipse depths, orbitalperiods, and spectral types of about 1000 eclipsing binary systems areexamined, after attempting to subdivide these binaries into variousbasic evolutionary categories. The applicability of statisticalcriteria, based on light curve morphologies and eclipse depths, for thecategorization of eclipsing binaries has been found more limited thanpreviously believed. In particular, EW-type light curves turn out to begood indicators of contact systems (though not conversely), while EA-and EB-type light curves have little physical significance. Moreover,the study reveals a strong deficit of short-period noncontact systems inthe whole spectral range, together with an underabundance of early-typecontact binaries (compared with the number of late-type contact pairs).Interestingly, the distribution of evolved Algol-type systems isshifted, on average, to periods longer than those of unevolved detachedsystems in the OB and early A spectral range (and to shorter periods inthe F spectral range).

Analysis of eleven late-type close binary systems.
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Observation and Astrometry data

Constellation:Vierge
Right ascension:13h27m44.79s
Declination:+03°52'26.7"
Apparent magnitude:10.341
Proper motion RA:0.4
Proper motion Dec:-1.8
B-T magnitude:10.539
V-T magnitude:10.358

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 303-633-1
USNO-A2.0USNO-A2 0900-07396500
HIPHIP 65660

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