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 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 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 1995A&AS..113..419W presented positions not
correctly associated to the stars (see the "History" section below)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 100 924 Data for 924 stars and their membership.
(table 8 of paper in 1995A&AS..113..419W 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
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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
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Bytes Format Units Label Explanations
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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 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
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Note on Seq: Numbers 1 to 257 were published also in Wang and Jiang,
Acta Astronomica Sinica (1991AcASn..32..176W 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 1952ApJ...116..640J),
Upgren et al. (1979AJ.....84.1586U 1979AJ.....84.1586U),
W - combined from Weis (1981PASP...93..437W 1981PASP...93..437W),
and Stauffer (1982PASP...94..678S 1982PASP...94..678S)
G - Goetz's (1984AN....305...17G 1984AN....305...17G)
J - Jones & Cudworth's (1983AJ.....88..215J 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 1983AJ.....88..215J)
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Byte-by-byte Description of file: cat1991.dat
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Bytes Format Units Label Explanations
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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
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Plate Summary:
Plates of Praesepe taken with the Zo-se 40cm refractor (table 1)
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Plate No. Date LMST at Exp. Emuls. Filter Central Observer
mid-exp. Star
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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
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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