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J/AJ/126/2922       Astrometry and membership in NGC 188     (Platais+, 2003)

WIYN open cluster study. XVII. Astrometry and membership to V=21 in NGC 188. Platais I., Kozhurina-platais V., Mathieu R.D., Girard T.M., Van Altena W.F. <Astron. J., 126, 2922-2935 (2003)> =2003AJ....126.2922P
ADC_Keywords: Clusters, open ; Proper motions ; Photometry, CCD Keywords: astrometry - open clusters and associations: individual (NGC 188) Abstract: We present techniques for obtaining precision astrometry using old photographic plates from assorted large-aperture reflectors in combination with recent CCD Mosaic Imager frames. At the core of this approach is a transformation of plate/CCD coordinates into a previously constructed astrometric reference frame around the open cluster NGC 188. Description: The astrometric reductions are based on 30 photographic plates taken with three different large reflectors in Johnson's BV bandpasses, combined with numerous CCD mosaic frames obtained with the Kitt Peak National Observatory (KPNO) Mayall 4m telescope (Table 1). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 137 7812 Catalog of positions, proper motions, and BV CCD photometry in the region of open cluster NGC 188
See also: J/AJ/124/601 : Absolute positions + proper motions in NGC 188 (Platais+, 2002) Table 1: Plates and CCD mosaic frames -------------------------------------------------------------------------------- Telescope Latitude (deg) Plates Epoch Range Scale -------------------------------------------------------------------------------- Mount Wilson 60 inch 34.22 5B, 2V 1958-1959 27.1"/mm Hale 5 m 33.36 2B, 2V 1960 11.1"/mm KPNO 4 m 31.96 10B, 9V 1975-1979 18.6"/mm KPNO 4 m 31.96 26B, 81V 1998-2001 0.26"/pixel Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- PKM Object identifier, Cl* NGC 188 PKM NNNN 6- 15 F10.7 deg RAdeg Right Ascension expressed in decimal degrees ICRS, Ep=J2000 (1) 17- 26 F10.7 deg DEdeg Declination expressed in decimal degrees ICRS, Ep=J2000 (1) 28- 33 F6.2 mas/yr pmRA Proper motion in Right Ascension multiplied by cos(DE) (2) 35- 40 F6.2 mas/yr pmDE Proper motion in declination (2) 42- 45 F4.2 mas/yr e_pmRA Standard error in pmRA 47- 50 F4.2 mas/yr e_pmDE Standard error in pmDE 52- 53 I2 --- Num Initial number of photographic plates and CCD frames used for astrometry 55- 56 I2 --- o_pmRA Number of deleted datapoints in RA astrometric solution 58- 59 I2 --- o_pmDE Number of deleted datapoints in DE astrometric solution 61- 62 I2 % MProb ?=-1 Membership probability (3) 64- 69 F6.3 mag Vmag The CCD V band magnitude 71- 76 F6.3 mag B-V The (B-V) color index from CCD photometry (4) 78- 79 I2 --- o_Vmag Number of V CCD frames 81- 82 I2 --- o_Bmag Number of B CCD frames 84- 88 F5.3 mag e_Vmag Estimated standard deviation in V magnitude 90- 94 F5.3 mag e_Bmag Estimated standard deviation in B magnitude 96 A1 --- ICode [DG] Internal classification code (5) 98-101 I4 --- DGV ? Cross-identification with Dinescu et al., 1996AJ....111.1205D, Cl* NGC 188 DGV NNNN 103-109 A7 --- S62 Cross-identification with Sandage, 1962ApJ...135..333S, (6) 111-117 F7.2 yr epRA Mean epoch of RA position 119-123 F5.1 mas e_RAdeg Standard error in RA multiplied by cos(DE) 125-131 F7.2 yr epDE Mean epoch of DE position 133-137 F5.1 mas e_DEdeg Standard error in DE
Note (1): For the epoch 2000.0 degrees and in the ICRS reference system (i.e. equinox J2000.0). Note (2): A proper motion equal to exact zero in both coordinates is set for extremely poor measurements. Note (3): -1 = the probability has not been calculated. Note (4): -0.500 = unknown B-V. Note (5): Internal classification code: G = galaxy (only `astrometric' galaxies marked); D = visual binary with separation less than 5". Note (6): Simbad denominations: A: Cl* NGC 188 San A I-NNN: NGC 188 1NNN II-NNN: NGC 188 2NNN III-NNN: NGC 188 3NNN
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Jan-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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