Stellar Radio Astrometry - Part Three - Preliminary Comparison of the Radio Reference Frame and the Optical FK4-BASED Reference Frame by Use of Stellar Radio Emission

Details Stellar Radio Astrometry - Part Three - Preliminary Comparison of the Radio Reference Frame and the Optical FK4-BASED Reference Frame by Use of Stellar Radio Emission Stellar Radio Astrometry - Part Three - Preliminary Comparison of the Radio Reference Frame and the Optical FK4-BASED Reference Frame by Use of Stellar Radio Emission

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2390j&link_type=abstract

ASTRONOMICAL JOURNAL V.90:11, NO.1558/NOV, P.2390, 1985

Astronomy and Astrophysics

Astronomy

34

Scientific paper

The precise positions of 22 stars that display radio emission have been used to obtain a preliminary relationship between the present radio reference frame and the optical FK4-based reference frame as it is represented by the AGK3RN catalog in the northern hemisphere at an accuracy of 0."05. Local systematic differences in the reference frames with amplitudes of order 0."15 are found for the northern hemisphere, confirming the earlier relationship obtained from comparison of the positions of the radio and optical emission of a sample of 27 extragalactic reference sources. This shows that directly relating the optical and radio reference frames via bright optical stars (mv <10) gives the same result as relating via faint (mv ≍ 17-20) optical extragalactic objects, which display completely different radio and optical spatial structures and emission mechanisms. The present data are not sufficient to provide a final solution. A denser grid (1 source/l00 deg2) of common optical/radio reference sources is needed to determine the detailed relationship in the northern hemisphere. Optical and radio maps of extended objects or point sources can be aligned only to the level of accuracy with which the relationship of the two independent reference frames can be established. The completion of an improved optical reference frame (SRS catalog) for the southern hemisphere is urgently needed before a similar detailed comparison of the optical and radio reference frames can be accomplished for southern stars.

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