J/AJ/105/1441 IC 4665 (Prosser 1993)
The open cluster IC 4665
PROSSER C.F.
<Astron. J. 105, 1441 (1993)>
=1993AJ....105.1441P 1993AJ....105.1441P
ADC_Keywords: Clusters, open; Positional data; Photometry, UBVRI; Spectroscopy
Abstract:
The results of a combined astrometric, photometric, and spectroscopic
program to identify members of the open cluster IC 4665 are presented.
Numerous new proper motion/photometric candidate members and at least
23 M dwarfs with H-alpha emission have been identified. A reanalysis
of IC 4665's age using different methods yields conflicting results
ranging from approx. 3x107 yr to the age of the Pleiades. This study
provides a list of candidate cluster members in the intermediate and
low-mass regime of this cluster. Future spectroscopic observations of
these candidates should eventually identify true cluster members. The
results of new echelle observations of some candidates and the
photometric monitoring of one apparent cluster member are given in an
appendix.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 120 55 IC 4665: Lick 30 s plates (3 exposures, each of
30 s duration) proper motion candidates
table2 119 142 IC 4665: Yerkes & Lick proper motion candidates
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Byte-by-byte Description of file: table1 table2
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Bytes Format Units Label Explanations
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1- 3 I3 --- P Running identification number
6- 10 F5.2 mag V Johnson V magnitude
11- 15 F5.2 mag B-V []? B-V color
16- 20 F5.2 mag V-I []? V-I color
21- 25 F5.2 mag R-I []? R-I color
27- 28 I2 --- v Number of observations at V magnitude
29- 30 I2 --- b Number of observations at B magnitude
31- 32 I2 --- i Number of observations at I magnitude
33- 34 I2 --- r Number of observations at R magnitude
37- 38 I2 h RAh Right ascension 1950
40- 41 I2 min RAm Right ascension 1950
43- 47 F5.2 s RAs Right ascension 1950
48 A1 --- DE- Declination sign
49- 50 I2 deg DEd Declination 1950
52- 53 I2 arcmin DEm Declination 1950
55- 58 F4.1 arcsec DEs Declination 1950
60- 66 F7.2 mm X Survey coordinates (East)
67- 73 F7.2 mm Y Survey coordinates (North)
74- 80 F7.2 arcsec/hyr pmX Relative proper motion component
81- 87 F7.2 arcsec/hyr pmY Relative proper motion component
88- 93 F6.2 arcsec/hyr e_pmX Error in pmX, one-sigma error
94- 99 F6.2 arcsec/hyr e_pmY Error in pmY, one-sigma error
102-105 A4 --- PROB Proper motion membership probability (1)
109 I1 --- N []? Number of Yerkes fields used to
determine proper motion (table2 only)
112-113 A2 --- Member [Y?N ] Membership on the basis of
photometry
116-120 A5 --- Other Other previous identifications
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Note(1):
A proper motion membership probability has been determined from
gaussian fitting to the cluster and field proper motion distributions
- however the reader is advised not to attach great weight to the
probabilities calculated due to the high contamination of field stars
found for this cluster.
No proper motion membership probabilities were calculated for the Lick
candidates in table2 due to the rough approximations made to correct
for magnitude dependent effects in the proper motions during the
analysis of the Lick 30min/1hr plate reductions.
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Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 21-Jun-1994