Kinematic Control of the Inertiality of the System of Tycho-2 and UCAC2 Stellar Proper Motions

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dc.creatorBobylev, Vadim V.
dc.creatorKhovritchev, Maxim Yu.
dc.date2006-08-26
dc.date.accessioned2026-07-07T07:19:26Z
dc.date.available2026-07-07T07:19:26Z
dc.descriptionBased on the Ogorodnikov-Milne model, we analyze the proper motions of Tycho-2 and UCAC2 stars. We have established that the model component that describes the rotation of all stars under consideration around the Galactic y axis differs significantly from zero at various magnitudes. We interpret this rotation found using the most distant stars as a residual rotation of the ICRS/Tycho-2 system relative to the inertial reference frame. For the most distant ($d\approx900$ pc) Tycho-2 and UCAC2 stars, the mean rotation around the Galactic y axis has been found to be $M_{13}=-0.37\pm0.04$ mas yr$^{-1}$. The proper motions of UCAC2 stars with magnitudes in the range $12-15^m$ are shown to be distorted appreciably by the magnitude equation in $μ_α\cosδ$, which has the strongest effect for northern-sky stars with a coefficient of $-0.60\pm0.05$ mas yr$^{-1}$ mag$^{-1}$. We have detected no significant effect of the magnitude equation in the proper motions of UCAC2 stars brighter than $\approx11^m$.
dc.description15 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0608572
dc.identifierhttp://arxiv.org/abs/astro-ph/0608572
dc.identifierAstron.Lett. 32 (2006) 608-621; Pisma Astron.Zh. 32 (2006) 676-890
dc.identifierdoi:10.1134/S1063773706090064
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/114621
dc.subjectAstrophysics
dc.titleKinematic Control of the Inertiality of the System of Tycho-2 and UCAC2 Stellar Proper Motions
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