The PM2000 Bordeaux proper motion catalogue ($\mathsf{+11\degr \leq \delta \leq +18\degr}$)

Abstract

We present a proper motion catalogue of 2 670 974 stars, covering the declination zone +11• ≤ δ ≤ +18• . Proper motions were derived from the comparison of the positional M2000 catalogue (systematic observations of the Bordeaux Carte du Ciel Zone with the meridian circle, completed in 2000) with positions derived from the reduction of 512 Carte du Ciel plates of the Bordeaux zone (scanned at the APM Cambridge), the AC2000.2 catalogue, the USNO−A2.0 catalogue and the unpublished Yellow Sky (YS3) USNO catalogue. The catalogue has a limiting magnitude V M = 16.2 (Bordeaux CCD meridian circle magnitude) and is complete down to V M = 15.4. Depending on magnitude, the positional precision at mean epoch ranges from 50 to 70 mas and the precision of proper motions varies from 1.5 mas/yr to 6 mas/yr. Meridian V M magnitudes are provided for all objects together with additional photometry from the 2MASS catalogue when available (99.5% of objects). Positions and proper motions are on the ICRS (International Celestial Reference System). Systematic offsets in 2MASS positions and in UCAC2 proper motions were revealed from comparisons with PM2000.

The influence of radio-extended structures on offsets between the optical and VLBI positions of sources in the ICRF2

“…It is important to notice that Fig. 5 shows no evidence of increasing or decreasing trend of the offset values as a function of the colour index as one would expect (see, for instance, Zacharias et al 2004;Ducourant et al 2006). This feature agrees with the study presented by Stone (2002) and profited from the red filters used in the observations as well as the moderate zenith distances involved.…”

A variability sample catalogue selected from the Sydney Observatory Galactic Survey

“…We adopted μ = 0.02 yr −1 as our threshold based on our estimate that the error in our proper motions is about 0.003 yr −1 , which follows from the ≈90-yr epoch difference between the SOAP and the Quick V survey and equatorial coordinates accurate at a 0.3 level. We investigated the p.m. errors as function of the apparent magnitude m b and we observed that the level of 0.003 yr −1 is similar to the result obtained in other studies dealing with the same type of 100-yr old observations (Ducourant et al 2006).…”

Kinematic parameters and membership probabilities of open clusters in the Bordeaux PM2000 catalogue

“…The PM2000 catalogue (Ducourant et al 2006) is a proper motion catalogue that comprises about 2.6 million stars in the declination zone +11 • ≤ δ ≤ +18 • and contains positions and proper motions on the ICRS (International Celestial Reference System), as well as meridian magnitudes V M . It was derived from the compilation of systematic drift-scan observations in the Bordeaux Carte du Ciel Zone with the Bordeaux automated meridian circle (Viateau et al 1999) carried out over four years, the reduction of 512 Carte du Ciel plates (epoch t ≈ 1900) of the Bordeaux zone (Rapaport et al 2001) scanned at the APM Cambridge, and the catalogues AC2000.2 (t ≈ 1907), USNO-A2.0 (t ≈ 1950) and the unpublished USNO Yellow Sky (YS3, t ≈ 1978).…”

“…Based on these results, we undertook a purely kinematic determination of open cluster membership probabilities for objects located in the zone covered by the high precision proper motion catalogue PM2000 (Ducourant et al 2006). We used a fully automated optimization method and a set of modified parametrisations for the probability distribution functions based on Zhao et al (1990Zhao et al ( , 2006.…”