Back to Search Start Over

PPM-Extended (PPMX) ? a catalogue of positions and proper motions

PPM-Extended (PPMX) ? a catalogue of positions and proper motions

Authors :
R?ser, S.
Schilbach, E.
Schwan, H.
Kharchenko, N.
Piskunov, A.
Scholz, R.-D.
Source :
Astronomy and Astrophysics; September 2008, Vol. 488 Issue: 1 p401-408, 8p
Publication Year :
2008

Abstract

Aims. We build a catalogue PPM-Extended?(PPMX) on the ICRS system which is complete down to a well-defined limiting magnitude and contains the best presently available proper motions suited for kinematic studies in the Galaxy.Methods. We perform a rigorous weighted least-squares adjustment of individual observations, spread over more than a century, to determine mean positions and proper motions. The stellar content of PPMX is taken from GSC?1.2 supplemented by catalogues like ARIHIP, PPM and Tycho-2 at the bright end. All observations have been weighted according to their individual accuracy. The catalogue has been screened towards rejecting false entries in the various source catalogues.Results. PPM-Extended (PPMX) is a catalogue of 18?088?919?stars containing astrometric and photometric information. Its limiting magnitude is about 15.2 in the GSC photometric system. PPMX consists of three parts: a) a survey complete down to RU= 12.8 in the magnitude system of UCAC2; b) additional stars of high-precision proper motions, and c) all other stars from GSC?1.2 identified in 2MASS. The typical accuracy of the proper motions is 2 mas/y for 66?percent of the survey stars (a) and the high-precision stars?(b), and about 10?mas/y for all other stars. PPMX contains photometric information from ASCC-2.5 and 2MASS.

Details

Language :
English
ISSN :
00046361 and 14320746
Volume :
488
Issue :
1
Database :
Supplemental Index
Journal :
Astronomy and Astrophysics
Publication Type :
Periodical
Accession number :
ejs15821555