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I/257B             Proper Motions in Praesepe            (Wang+, 1995)

J2000.0 positions and proper motions of 257 stars in the central part of the Praesepe astrometric standard region Wang J.J., Jiang P.F. <Acta Astron. Sinica. 32, 176 (1991)> =1991AcASn..32..176W High-precision study of proper motions and membership of 924 stars in the central region of Praesepe. Wang J.J., Chen L., Zhao J.H., Jiang P.F. <Astron. Astrophys. Suppl. Ser. 113, 419 (1995)> =1995A&AS..113..419W
ADC_Keywords: Clusters, open ; Positional data ; Proper motions Keywords: Praesepe - astrometry - proper motion Description: High-precision proper motions for 257 and 296 stars in a 90'x90' region centered on BD+20 2170 were obtained from seven plates taken with the Zo-se 40cm refractor (f=6895mm) in March, 1986 (see the "Plate Summary" section below), combined with six AC plates and the stellar positions in Russell's (1976, Ph.D. Thesis, Pittsburgh University). Combined with other data, membership probabilities were estimated by an improved maximum likelihood method. A very good sample of 198 members is obtained with proper motion accuracies ranging from ±0.2 to ±5.0mas/yr, of which 60% are better than ±1.0mas/yr; the completeness limit is about B=15.5mag. Note that the table published in electronic form associated to the paper published in 1995A&AS..113..419W presented positions not correctly associated to the stars (see the "History"(?) section below) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 100 924 Data for 924 stars and their membership. (table 8 of paper in 1995A&AS..113..419W) cat1991.dat 73 257 J2000.0 positions and proper motions of 257 stars in the central part of the Praesepe astrometric standard region
See also: III/55 : Radial Velocities in Open Clusters (Mermilliod 1979) J/AJ/106/1080 : Lithium in Praesepe (Soderblom+, 1993) J/A+A/298/115 : ROSAT study of Praesepe (Randish+, 1995) J/A+AS/109/29 : Very low mass stars in Praesepe (Hambly+, 1995) J/A+AS/129/9 : Delta Sct stars in Praesepe (Pena+ 1998) J/ApJ/521/682 : Binaries in the Praesepe and Coma clusters (Abt+, 1999) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
2- 4 I3 --- Seq *[1,924]+ Sequential number 6- 8 I3 --- Russel ? Russell's (1976, Ph.D. Thesis) number 10- 13 A4 --- KW ? Klein-Wassink's (1927, Groningen Publ. 41) 15- 17 I3 --- NArt ? Artyukhina's (1971, Soob. Sternberg 172, 3) 19- 21 I3 --- NJC ? Jones & Cudworth's (1983AJ.....88..215J) 24 A1 --- AC [*] AC star is indicated with '*' 27- 31 F5.2 mag Mag V magnitude or B magnitude when there is a 'B' in the next column 32 A1 --- f_Mag [B] When 'B' given magnitude is B magnitude 33- 37 F5.2 mag B-V ? B-V colour index 39 A1 --- f_B-V [PG] Photoelectric or photoGraphic color 40 A1 --- r_B-V *[CWGJRH] Origin of the photometry 41 A1 --- q_B-V *[BGFP] Quality of the photometry 43 I1 h RAh Right ascension Equinox=J2000.0, Epoch=1986.17 45- 46 I2 min RAm Right ascension Equinox=J2000.0, Epoch=1986.17 48- 53 F6.3 s RAs Right ascension Equinox=J2000.0, Epoch=1986.17 55 A1 --- DE- Declination sign 56- 57 I2 deg DEd Declination for Equinox=J2000.0, Epoch=1986.17 59- 60 I2 arcmin DEm Declination for Equinox=J2000.0, Epoch=1986.17 62- 66 F5.2 arcsec DEs Declination for Equinox=J2000.0, Epoch=1986.17 69- 72 I4 0.1mas/yr pmRA Proper motion component in right ascension reduced into the great circle 74- 76 I3 0.1mas/yr e_pmRA Standard error of proper motion in RA 78- 82 I5 0.1mas/yr pmDE Proper motion component in declination 84- 86 I3 0.1mas/yr e_pmDE Standard error of proper motion in DE 88- 91 F4.2 --- Prob Membership probability 93 I1 --- Member [0,1] Membership judgement: '1' cluster star (Prob≥0.36) '0' field star (Prob<0.36) 95-100 A6 --- n_Member *Notes about previous membership judgements
Note on Seq: Numbers 1 to 257 were published also in Wang and Jiang, Acta Astronomica Sinica (1991AcASn..32..176W), see file "cat1991.dat" Note on r_B-V: the origin of the photometry is coded as follows: C - combined from Johnson (1952ApJ...116..640J), Upgren et al. (1979AJ.....84.1586U), W - combined from Weis (1981PASP...93..437W), and Stauffer (1982PASP...94..678S) G - Goetz's (1984AN....305...17G) J - Jones & Cudworth's (1983AJ.....88..215J) R - Russell's (1976, Pd.D. Thesis, Pittsburgh University) H was never explained. Note on q_B-V: the quality letters correspond to an estimated standard error: B - s.e. less than 0.01 G - s.e. from 0.01 to 0.04 F - s.e. from 0.04 to 0.08 P - s.e. greater than 0.08 Note on n_Member: the symbols are: K - member by Klein-Wassink (1927, Groningen Publ. 41) A - member by Artyukhina (1971, Soobshch. Astron. Inst. Sternberg 172, 3) 1..9 - non-zero membership probability by Jones & Cudworth (1983AJ.....88..215J)
Byte-by-byte Description of file: cat1991.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1,257]+ Sequential number 6- 8 I3 --- Russel Russel number 9 A1 --- n_Russel [*] Note on Russel number (See text in the original publication) 11 I1 h RAh Right ascension J2000.0 13- 14 I2 min RAm Right ascension J2000.0 16- 22 F7.4 s RAs Right ascension J2000.0 25- 27 I3 10-4s e_RAs rms uncertainty on right ascension 28 A1 --- DE- Declination sign 29- 30 I2 deg DEd Declination J2000.0 32- 33 I2 arcmin DEm Declination J2000.0 35- 40 F6.3 arcsec DEs Declination J2000.0 42- 44 I3 10-3arcsec e_DEs rms uncertainty on declination 46- 54 F9.6 s/yr pmRA Proper motion in right ascension 56- 59 I4 10-6s/yr e_pmRA rms uncertainty on pmRA 61- 68 F8.5 arcsec/yr pmDE Proper motion in declination 70- 73 I4 10-5arcsec/yr e_pmDE rms uncertainty on pmDE
Plate Summary: Plates of Praesepe taken with the Zo-se 40cm refractor (table 1) -------------------------------------------------------------------------------- Plate No. Date LMST at Exp. Emuls. Filter Central Observer mid-exp. Star -------------------------------------------------------------------------------- S86015 1986 3 1 8h 39m 30m 103a-0 - Rus207 Wang S86016 1986 3 2 8h 40m 30m 103a-0 - Rus207 Wang S86019 1986 3 3 8h 39m 30m 103a-0 - Rus207 Wang S86022 1986 3 4 8h 40m 30m 103a-0 - Rus207 Wang S86023 1986 3 5 8h 39m 30m 103a-0 - Rus207 Wang S86024 1986 3 6 8h 40m 30m 103a-0 - Rus207 Wang S86025 1986 3 7 8h 39m 30m 103a-0 - Rus207 Wang Historical note: * 26-Jan-1995: The file "cat1991.dat" was prepared at CDS. * 03-Jun-2000: Version 'A' created by merging the 1991 catalog with the data from 1995 paper (J/A+AS/113/419) * 02-Dec-2004: Version 'B' where most of the positions from the 1995 paper (Seq ≥ 258) were assigned to the wrong row of the table. For one star (Seq=923, KW 518) the position was taken from the GSC (GSC V1.2, Cat. I/254, Star GSC 01396-00157).
(End) J. Marcout, P. Bauer (1995), C. Brunet, F. Ochsenbein [CDS] 02-Dec-2004
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