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Searching for possible siblings of the sun from a common cluster based on stellar space velocities

Bobylev, V. V.; Bajkova, A. T.; Mylläri, A. +1 more

We propose a kinematic approach to searching for the stars that could be formed with the Sun in a common "parent" open cluster. The approach consists in preselecting suitable candidates by the closeness of their space velocities to the solar velocity and analyzing the parameters of their encounters with the solar orbit in the past in a time interv…

Application of vector spherical harmonics for kinematic analysis of stars from zonal catalogues

Tsvetkov, A. S.; Vityazev, V. V.

We solve the problem on a kinematic analysis of the three-dimensional velocity field of stars from zonal catalogues, i.e., catalogues in which the stars are presented at all right ascensions in some declination zones. We have constructed a system of vector spherical harmonics with the properties of completeness and orthogonality for a chosen decli…

The red giant branch in the Tycho-2 catalogue

Gontcharov, G. A.

Based on multicolor photometry from the 2MASS and Tycho-2 catalogues, we have produced a sample of 38 368 branch red giants that has less than 1% of admixtures and is complete within 500 pc of the Sun. The sample includes 30 671 K giants, 7544Mgiants, 49 C giants, and 104 suspected supergiants or S stars. The photometric distances have been calcul…