2194A II/194A Photometric study of IC 4665 M F S J McCarthy S S J O'Sullivan Ricerche Astron. 7 483-498 1969 1969RA......7..483M Clusters, open Photographic catalog Photographic observations of the open cluster IC 4665 made on blue and yellow sensitive plates with the Vatican 40 cm refractor are presented and discussed. Apparent magnitudes were determined for 200 stars by means of a program of photometric reduction designed by BERTIAU. The mean internal errors in the final blue and yellow magnitudes average about 0.02 mag. All stars selected for measurement of proper motions by VASILEVSKIS on long base-line Allegheny plates have been observed here. The forty stars which VASILEVSKIS' proper motion measures have shown to be probable members constitute a normal main sequence from V = 7 to V = 13.5, followed by a gap of 0.2 to 0.3 mag, and a group of 10 stars in the subgiant domain. The reality of this gap and the membership characteristics of the stars in the subgiant region of the C - M diagram are discussed.

Vno Number on the plate (Vasilevskis) --- Kno Number in Kopff --- Ano Number in Alcaino --- BD Bonner Durchmustering identification --- Vpe V photoelectric mag (B-V)pe (B-V) color photoelectric mag Vpg V photographic mag (B-V)pg (B-V) photographic mag Notes Notes as follows: 1 = pe data from Hogg & Kron, AJ 60, 365 2 = pe data from Johnson ApJ 119, 181 and ApJ 126, 121 3 = pe data (this paper) 4 = pe data from Coyne (priv. comm.) 5 = not used as yellow standard --- Vno Number on the plate (Vasilevskis) --- Kno Number in Kopff --- Ano Number in Alcaino --- BD Bonner Durchmustering identification --- B Photographic B mag V photographic V mag (B-V) color mag e_B mean error on B mag e_V mean error on V mag Class 1=probable member, 2=Possible member, 3=Less possible member --- Notes Notes as follows: #1 = Less than 6 plates in B determination #2 = Less than 6 plates in V determination #3 = Identification from Kopff, Mitt. Hamburger Sternw. 8, No 52 #4 = Suspected variable #6 = Photoelectric data from Hogg & Kron, AJ 60, 365 --- M.-J. Wagner, James Marcout, Francois Ochsenbein CDS 1995Jun12 UNKNOWN UNKNOWN * 02-Jun-1994: Keypunched at CDS, Strasbourg. Tables 2, 3 and 4 merged into single file table2. * 13-Jun-1995: errors corrected in table2 at CDS Star 093 Ano is 25 (instead of 26) Star 090 is BD+5 3483 (instead of BD+5 3843) Star 105 Ano is 24 (instead of 4) Star 033 Kno is 37 (instead of 38) II_194A.xml