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J/AJ/105/1441             IC 4665                                 (Prosser 1993)

The open cluster IC 4665 PROSSER C.F. <Astron. J. 105, 1441 (1993)> =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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 120 55 IC 4665: Lick 30 s plates (3 exposures, each of 30 s duration) proper motion candidates table2 120 142 IC 4665: Yerkes & Lick proper motion candidates
Byte-by-byte Description of file: table1 table2
Bytes Format Units Label Explanations
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
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. Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 21-Jun-1994
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