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II/194A Photometric study of IC 4665 (McCarthy+ 1969)
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table1 table2
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A photometric study of the open cluster IC 4665
McCARTHY M.F.S.J., O'SULLIVAN S.S.J.
<Ricerche Astron., 7, 483-498 (1969)>
=1969RA......7..483M (SIMBAD/NED RefCode)
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ADC_Keywords: Clusters, open ; Photographic catalog
Summary:
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.