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J/A+A/299/53        Red giants in NGC 3680 and IC 4651       (Mermilliod+, 1995)
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Red giants in open clusters: IV. NGC 3680 and IC 4651
      Mermilliod J.-C., Andersen J., Nordstrom B., Mayor M.
     <Astron. Astrophys. 299, 53 (1995)>
     =1995A&A...299...53M       (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open; Stars, giant; Radial velocities
Keywords: open clusters and associations: individual: NGC 3680 -
          individual: IC 4651 - star: red giant - binary: spectroscopic

Abstract:
   Radial-velocity observations of 35 red giants in the field of the 
   intermediate-age open clusters NGC 3680 and IC 4651 are presented and 
   analysed for membership and duplicity. Five stars in NGC 3680 and one in 
   IC 4651 were identified as non-members, and six and five spectroscopic 
   binaries, respectively, were discovered among the red giant members in the 
   two clusters. Orbits have been determined for seven of the binaries, four 
   of which are still preliminary. The mean cluster velocities of NGC 3680 
   and IC 4651 are 0.9+/-0.2km/s and -31.0+/-0.2km/s respectively. The 
   morphology of the red giant region in the colour magnitude diagrams shows 
   a well-populated clump in both clusters. In both clusters, one certain 
   member star is clearly brighter and redder than the clump, while IC 4651 
   shows, in addition, a probable concentration of stars on the ascending 
   giant branch. 

File Summary:
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  FileName      Lrecl   Records    Explanations
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ReadMe             80        .      This file
n3680              38      143      Radial velocity data for NGC 3680
i4651              38      204      Radial velocity data for IC 4651
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See also:
  Paper   I =1989A&A...219..125M : NGC 2447, 2539, 2632, 6633 and 6940
  Paper  II =1989A&AS...79...11M : Binaries in
                                   NGC 2360, 2437, 2447, 5822, 5823 and 6475
  Paper III =1990A&A...237...61M : NGC 2360, 2423, 5822, 6811 and IC 4756
  J/A+A/307/80  : Part. V.   NGC 2099 (Mermilliod+ 1996)
  J/A+A/319/481 : Part. VI.  10 spectroscopic binaries orbits (Mermilliod+ 1997
  J/A+A/324/91  : Part. VII. Mel 71 red giants radial vel. (Mermilliod+ 1997)

Byte-by-byte Description of file: i4651, n3680
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   Bytes Format  Units   Label    Explanations
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   1-  4  I4     ---     ID       Star number (1)
   8- 18  F11.3  d       HJD      Heliocentric Julian Date
      21  A1     ---     Comp     Component of a double-lined binary
  26- 31  F6.2   km/s    RV       Radial velocity
  34- 38  F5.2   km/s  e_RV       rms uncertainty on the radial velocity
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Note (1): The numbering system used for NGC 3680 is from: Eggen O.J. 1969,
           Astrophys. J. 155,439
          The numbering system used for IC 4651 is from: Lindoff U. 1972,
            Astron. Astrophys. Suppl. 7,231
          For the identification of stars No 801 to 811 see the publication.
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Courtesy: J.-C. Mermilliod <mermio@scsun.unige.ch>
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(End)                                         Patricia Bauer [CDS]   13-Feb-1995