Access to Astronomical Catalogues

J/A+AS/118/277      Proper motions in NGC 1647   (Geffer+ 1996)
The astrometric accuracy of ``Carte du Ciel'' plates and proper motions
in the field of the open cluster NGC 1647
     Geffert M., Bonnefond P., Maintz G., Guibert J.
    <Astron. Astrophys. Suppl. Ser. 118, 277 (1996)>
    =1996A&AS..118..277G        (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Proper motions

Keywords: astrometry - stars: individual: SZ Tau -
          Galaxy: open clusters: individual: NGC 1647

Abstract:
    The astrometric accuracy of triple image Carte du Ciel plates has 
    been analysed using plates of the open cluster NGC 1647. A new
    multithreshold technique was used for the treatment of the triple
    image plates. Accuracies ranging from 100mas to 200mas were found. We
    determined proper motions with a median accuracy of 1.6mas/a for 2220
    stars in the field of NGC 1647. The membership probabilities of stars
    in the cluster region agree very well with the data of Francic (1989).
    Due to a significant difference of the proper motions of SZ Tau and
    the cluster members, SZ Tau seems not to be a member of NGC 1647.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table7            57     2220   Positions and proper motions of 2220 stars in
                                  the region of NGC 1647.


Byte-by-byte Description of file: table7

   Bytes Format Units   Label     Explanations

   6-  9  I4    ---     NR        Internal star number
  12- 13  I2    h       RAh       Right ascension (J2000)
  15- 16  I2    min     RAm       Right ascension (J2000)
  18- 23  F6.3  s       RAs       Right ascension (J2000)
      26  A1    ---     DE-       Declination sign
  27- 28  I2    deg     DEd       Declination (J2000)
  30- 31  I2    arcmin  DEm       Declination (J2000)
  33- 37  F5.2  arcsec  DEs       Declination (J2000)
  40- 47  F8.1  mas/a   pmRA      Proper motion in right ascension
  50- 57  F8.1  mas/a   pmDE      Proper motion in declination


Courtesy: Michael Geffert 

(End)                                          Patricia Bauer [CDS]  16-Sep-1996