Absolute dimensions and apsidal motion of the eccentric binary PT Velorum
High-resolution (λ/dλ ~ 41000) echelle spectra of theeccentric binary system PT Vel were analysed. Precise spectroscopicorbital elements of the system were obtained by means ofcross-correlation technique. According to the solution of radialvelocities with Hipparcos and All Sky Automated Survey-3 (ASAS-3) lightcurves, PT Vel consists of two main-sequence stars with massesM1 = 2.198 +/- 0.016Msolar,M2 = 1.626+/- 0.009Msolar, radii R1 = 2.094 +/-0.020Rsolar,R2 = 1.559 +/- 0.020Rsolarand temperatures Teff1 = 9250 +/- 150 K, Teff2 =7650 +/- 200 K separated from each other by A = 9.74 +/-0.02Rsolar in an orbit inclined . The projected rotationalvelocities of component stars were found to be (v sini)1 = 63+/- 2 and (v sini)2 = 40 +/- 3kms-1 from thecomparison of observed spectra with synthetic spectra which werecalculated using model atmospheres. Our measurements of the projectedrotational velocities indicate that both stars rotate synchronously.Analysis of longitude of periastron values obtained from light-curveanalysis from different photometric sets of this moderately eccentricsystem (e = 0.127 +/- 0.006) has revealed a significant motion of theline of apsides of corresponding to an apsidal motion period of U =182.2 +/- 8.4yr. The contribution from general relativity effects ismoderate (~9 per cent). A comparison with predictions from interiorstructure models shows the real stars to be more concentrated in massthan expected. Comparison of absolute dimensions with theoreticalisochrones yielded an age of the system of 400 +/- 40 Myr.
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A new catalogue of eclipsing binary stars with eccentric orbits
A new catalogue of eclipsing binary stars with eccentric orbits ispresented. The catalogue lists the physical parameters (includingapsidal motion parameters) of 124 eclipsing binaries with eccentricorbits. In addition, the catalogue also contains a list of 150 candidatesystems, about which not much is known at present.Full version of the catalogue is available online (see the SupplementaryMaterial section at the end of this paper) and in electronic form at theCDS via http://cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/MNRAS/(vol)/ (page)E-mail: ibulut@comu.edu.tr
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A catalogue of eclipsing variables
A new catalogue of 6330 eclipsing variable stars is presented. Thecatalogue was developed from the General Catalogue of Variable Stars(GCVS) and its textual remarks by including recently publishedinformation about classification of 843 systems and making correspondingcorrections of GCVS data. The catalogue1 represents thelargest list of eclipsing binaries classified from observations.
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Hipparcos Eclipsing Binaries Showing Apsidal Motion
V366 Puppis, PT Velorum and V466 Carinae are found to be eccentricbinaries displaying apsidal motion.
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The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
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VBLUW-photometry of stars in small fields around 13 planetary nebulae
Observations of stars in small fields around 13 planetary nebulae, madeusing the Walraven five-channel VBLUW photometer, are presented anddescribed. The fields are found to have a radius of about 0.3 deg. Thefinding charts for the measured stars are given. It is shown that moststars are brighter than mV of about 14 mag and that the photometry hasan accuracy of better than 1 percent, except for stars that are observedwith short test-integrations and for stars fainter than mV of about 14mag. The photometric data for all stars are presented, together with alist of identifications and spectral types.
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Bright Southern BV-Stars
Not Available
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INHABITED SKY
