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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7 57 2220 Positions and proper motions of 2220 stars in
the region of NGC 1647.
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Byte-by-byte Description of file: table7
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Bytes Format Units Label Explanations
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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
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Courtesy: Michael Geffert
(End) Patricia Bauer [CDS] 16-Sep-1996