Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie B, No. 16

Author(s): Fricke, W.
Title: Precession and Galactic Rotation Derived from Fundamental Proper Motions of Distant Stars
Source: Astron. J. 72, 1368-1379
Year: 1967
Abstract: Precessional corrections and the parameters of galactic rotation were derived in the systems GC, FK3, N30, and FK4 from the fundamental proper motions of 512 stars with distances greater than about 100 pc. Effects arising from anomalies in the distance distribution of the stars, from fluctuations in the velocity field due to star streams and from errors in the alpha and delta systems, were investigated by carrying out a number of alternative solutions. The value DELTAp1 determined for the correction to Newcomb's lunisolar precession, DELTAp1=+1.10''+/-0.10'' per century, is precisely the same on the basis of the systems FK3, N30, and FK4, while the value in the GC system is slightly different. The value DELTAlambda+DELTAe describing the combined correction due to incorrect planetary precession and a non-precessional motion of Newcomb's equinox is DELTAlambda+DELTAe=+1.20''+/-0.11'' per century in both FK4 and N30, while the value is slightly different in FK3 and GC. The parameters of galactic rotation in the systems FK4 and N30 are (in units of km sec-1 kpc-1) FK4: A=+14.2 +/- 1.9, B=-11.8 +/- 1.9, N30: A=+17.1 +/- 1.9, B=-10.0 +/- 1.9. GC and FK3 reveal deviations, which are not greater than may be expected from the lower accuracy of these systems. It is shown that the stream motions of the well-known associations and stellar aggregates do not affect the results appreciably. Furthermore, there exists no indication of a rotation of a local group of stars deviating from differential galactic rotation.
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