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The Pul-3 catalogue of 58483 stars in the Tycho-2 system
A catalogue of positions and proper motions of 58483 stars (Pul-3) hasbeen constructed at the Pulkovo observatory. The Pul-3 is based on theresults of measurements of photographic plates with galaxies (Deutsch'splan). All plates were taken using the Pulkovo Normal Astrograph (thefirst epoch is in the 1950s and the second epoch is in the 1970s).The Pul-3 catalogue contains stars of mainly 12 to 16.5 mag in 146fields with galaxies in the declination zone from -5o to+85o. The Tycho-2 has been used as a reference catalogue.The mean epoch of the Pul-3 is 1963.25. The internal positional accuracyof the Pul-3 catalogue at the mean epoch of observations is ±80mas. The accuracy of the proper motions is mostly within ±3mas/yr to ±12 mas/yr. Comparisons of the Pul-3 with Tycho-2 andARIHIP have been done at the mean epoch of the Pul-3. The Pul-3 externalpositional accuracy relative to Tycho-2 is ±150 mas.The catalogue is only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/418/357
| Non-radial pulsation of the δ Scuti star UV Trianguli
We present the results of a three-year photometric study of the δScuti star UV Trianguli. Our data sets consist of 9378 differentialmeasurements in Johnson V together with a few data collected into theStrömgren uvbyβ system. UV Tri is at least a biperiodicvariable. The two best-fitting frequencies, f1= 9.3298d-1 and f2= 10.8513 d-1, are still notthe complete set of pulsation frequencies representing the lightvariations of the star. A suspected third frequency might present in thestar. Several `anomalous cycles' are observed in the light curves. Theyseem real, but are aperiodic. We derive the colour indices and physicalparameters for the variable and conclude that it is a Population Iδ Sct star with normal metal abundance ([Me/H]= 0.0 +/- 0.1 dex)evolving on its main-sequence stage at an early evolutionary phasebefore the turn-off point. Finally, we compare the observed oscillationfrequencies with theoretical models. The two pulsation modes of UV Triare likely to be non-radial gravity modes.
| Photometric Observations of the δ Scuti Star UV Trianguli and its Evolutionary Status
UV Tri was observed photometrically from 1999 to 2000 at the XinglongStation of the National Astronomical Observatories, Chinese Academy ofSciences, and was also observed with Strömgren uvbyHβ filter system at the Sierra Nevada Observatory(Spain) in 2000. From period analyses of the data, three pulsationfrequencies, 9.3299 c d-1, 10.8483 c d-1 and3.6035 c d-1 were obtained. We derived color indices: b-y =0.215, m1 = 0.169, c1 = 0.783, and β = 2.775.With these indices and some calibrations, we obtain: Mv =2.44, Mbol = 2.27, logL /Lȯ = 0.99, and logTeff = 3.875. Evolutionary sequences of stellar models with1.00-2.00 solar masses, at steps of 0.05 Msun, are computed. Eachsequence consists of 220 evolutionary intervals. From a comparisonbetween the observed and calculated physical parameters we conclude thatUV Tri is in an early evolutionary phase before the turn-off point.
| GPM - compiled catalogue of absolute proper motions of stars in selected areas of sky with galaxies.
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| The galactic foreground reddening in the direction of the nearby triangulum galaxy M33
Observations of 314 stars with the uvby-beta photometric system are usedto establish the reddening in the direction of the nearby Triangulumgalaxy M33. Color excesses are obtained for 151 A and F type stars in a1 deg radius centered around the galaxy. A color excess of E(b-y) =0.057 mag /E(B-V) = 0.077 mag/ is obtained for a distance modulus m - M= 10. A secondary result of this investigation is the discovery of sixsuspected variable stars, as well as ten observations of V Triangulum, aBeta Lyrae eclipsing variable.
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