ADC/CDS Standard Document for Catalog:/journal_tables/A+AS/113/419/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
J/A+AS/113/419 Proper motions in Praesepe (Wang+ 1995)
================================================================================
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; Astrometric data; Proper motions
Keywords: astrometry - open clusters, individual: Praesepe
Abstract:
High-precision proper motions for 257 and 296 stars in a 90x90' region
centered on BD+20 2170 were obtained from seven plates taken with the
40cm refractor (f=6895mm) at Zo-Se station of Shanghai Observatory
with six AC plates and the stellar positions in Russell's (1976, Ph.D.
Thesis, University of Pittsburgh) catalogue, respectively. Combining
with the data given by Klein-Wassink, Jones (1971), Artyukhina, and
Jones & Cudworth, these proper motions give a sample of 924 stars in
the region mentioned above. With membership probabilities 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 per cent are better than +/-1.0mas/yr, and the
completeness nearly down to B=15.5.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table8 101 924 Combined data of proper motions for 924 stars
in the central region of the Praesepe and
their membership
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 4 A3 --- Number Ordinal number
6- 8 A3 --- NRuss Russell's (1976) number
10- 13 A4 --- NKW ? Klein-Wassink's (1927) number
15- 17 A3 --- NArt ? Artyukhina's (1971) number
19- 21 A3 --- NJC ? Jones & Cudworth's (1983) number
24 A1 --- n_Number 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 --- n_Mag When 'B' given magnitude is B magnitude
33- 37 F5.2 mag B-V ? B-V colour index
39 A1 --- 1Remarks Remarks: see Note (1)
40 A1 --- 2Remarks Remarks: see Note (2)
41 A1 --- 3Remarks Remarks: see Note (3)
43 I1 h RAh Right ascension for the equinox J2000.0
and epoch 1986.17
45- 46 I2 min RAm Right ascension for the equinox J2000.0
and epoch 1986.17
48- 53 F6.3 s RAs Right ascension for the equinox J2000.0
and epoch 1986.17
55 A1 --- DE- Declination sign
56- 57 I2 deg DEd Declination for the equinox J2000.0
and epoch 1986.17
59- 60 I2 arcmin DEm Declination for the equinox J2000.0
and epoch 1986.17
62- 66 F5.2 arcsec DEs Declination for the equinox J2000.0
and 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 Membership judgement:
'1' cluster star (p>=0.36)
'0' field star (p<0.36)
95-100 A6 --- n_Member Notes about previous membership
judgements, note (4)
--------------------------------------------------------------------------------
Note (1): P - photoelectric
G - photographic
Note (2): C - combined from Johnson (1952), Upgren et al. (1979), Weis (1981),
and Stauffer (1982)
G - Gotz's (1984)
J - Jones & Cudworth's (1983)
R - Russell's (1976)
Note (3): 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 (4): K - member by Klein-Wassink (1927)
A - member by Artyukhina (1971)
Figures - non-zero membership probability by Jones & Cudworth (1983)
--------------------------------------------------------------------------------
References:
Artyukhina N.M. 1971, Soobshch. Gos. Astron. Inst. Sternberga 172, 3
=1971SoSht.172....3A
Gotz W. 1984, AN 305, 17 =1984AN....305...17G
Johnson H.L. 1952, ApJ 116, 640 =1952ApJ...116..640J
Jones B.F., Cudworth K. 1983, AJ 88, 215 =1983AJ.....88..215J
Klein-Wassink W.J. 1927, Groningen Publ. 41 =1927PGro...41....1K
Russell J.L. 1976, Ph.D. Thesis, University of Pittsburgh
Stauffer J. 1982, PASP 94, 678 =1982PASP...94..678S
Upgren A.R., Weis E.W., DeLuca E.E. 1979, AJ 84, 1586 =1979AJ.....84.1586U
Weis E.W. 1981, PASP 93, 437 =1981PASP...93..437W
--------------------------------------------------------------------------------
Courtesy: Wang Jiaji <xytan@fudan.ihep.ac.cn>
Historical note:
The meaning of probability p=0 and p=1 was inversed.
Correct definition was replaced on 06-Oct-1997
================================================================================
(End) Simona Mei [CDS] 21-Nov-1995