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Some Kinematical Properties of Solar Motion Using Stellar Associations
Elsanhoury, W. H.; Elkhateeb, M. M.
In this paper, we have constructed many models of the Solar motion and the kinematical properties for a sample of 5100 main sequence stars; into which 1528 early types (B5, A0, A5, F0, and F5) and about 3572 late types (G0, G5, K0, and K5). The sample was collected with aid of Extended Hipparcos Compilation (XHIP) Cross references. Based on the sp…
Four contact binaries as seen by Hipparcos.
Dumitrescu, A.; Rovithis-Livaniou, H.; Tsantilas, S. +2 more
Photometric Study of the Eclipsing Binary VW Leonis Minoris .
Dumitrescu, Alexandru
VW LMi (HIP 54003) was discovered by HIPPARCOS/TYCHO as a W UMa variable. We carried out BV photometry of this star. A photometric solution is derived with the Djurasevic model. The binary, having the temperatures of the components approximately equal, is an overcontact system. Phase shifts of the light curve maxima were observed.
The Local Stellar Velocity Distribution of the Galaxy
Şuran, Marian Doru; Ionescu, Adina; Popescu, Nedelia Antonia
This paper deals with systematic [r, B-V, MV] calculations of the kinematical parameters in the solar neighbourhood using a combination of the Hipparcos and Barbier-Brossat catalogues. A series of new kinematical and dynamical features are pointed, together with severe limitations and biasing of the two catalogues. The implications for …
Contributions of the Bucharest Observatory to the CONFOR program
Bocsa, Gheorghe
The connection between the optical reference frame and the radio one constitutes one of the main purposes of the astrometry. The paper is pointing out the contribution of the Bucharest Observatory in this direction. The statistic analysis of the standard errors for the astrometric PPM and TYCHO stars is presented.