J/A+AS/134/301 NGC 2354 red giants (Claria+ 1999)
Membership, binarity and metallicity of red giants in the
southern open cluster NGC 2354
Claria J.J., Mermilliod J.-C., Piatti A.E.
<Astron. Astrophys. Suppl. Ser. 134, 301 (1999)>
=1999A&AS..134..301C 1999A&AS..134..301C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, giant ; Radial velocities
Keywords: open clusters : individual: NGC 2354 - star: HR diagram; abundances
Abstract:
We present new Coravel radial-velocity observations and photoelectric
photometry in the UBV, DDO and Washington systems for a sample of red
giant candidates in the field of the intermediate-age open cluster
NGC 2354. Photometric membership probabilities show very good agreement
with those obtained from Coravel radial velocities. The analysis of
the photometric and kinematical data allow us to confirm cluster
membership for 9 red giants, one of them being a spectroscopic binary,
while 4 confirmed spectroscopic binaries appear to be probable
members. We have also discovered 4 spectroscopic binaries not
belonging to the cluster. A mean radial velocity of (33.40±0.27)km/s
and a mean reddening E(B-V)=0.13±0.03 were derived for the cluster
giants. NGC 2354 has a mean ultraviolet excess
<δ(U-B)≥-0.03±0.01, relative to the field K giants, and a
mean new cyanogen anomaly ΔCN=-0.035±0.007, both implying
[Fe/H]≃-0.3. The moderately metal-poor character of NGC 2354 is
confirmed using five different metal abundance indicators of the
Washington system. The cluster giant branch is formed by a well
defined clump of 7 stars and 4 stars with high membership
probabilities seem to define an ascending giant branch. The whole red
giant locus cannot be reproduced by any theoretical track.
Objects:
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RA (2000) DE Designation(s)
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07 14 07 -25 44.4 NGC 2354
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 26 87 CORAVEL radial velocity data
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See also:
J/A+A/299/53 : Red giants in NGC 3680 and IC 4651 (Mermilliod+, 1995)
J/A+A/307/80 : Velocities of red giants in NGC 2099 (Mermilliod+ 1996)
J/A+A/319/481 : 10 spectroscopic binaries radial velocities (Mermilliod+ 1997)
J/A+A/324/91 : Melotte 71 red giants radial velocities (Mermilliod+ 1997)
J/A+A/339/423 : Velocities of red giants in NGC 752 (Mermilliod+ 1998)
J/A+A/375/30 : Radial velocities in open clusters (Mermilliod+, 2001)
J/A+A/399/105 : Radial velocities of red giants in NGC 1817 (Mermilliod+ 2003)
J/A+A/423/189 : NGC 2477 red giants UBV phot. & RV (Eigenbrod+, 2004)
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- NGC2354 Star number (NGC 2354 NNN in Simbad) (1)
5- 15 F11.3 d HJD Heliocentric Julian Date
17- 21 F5.2 km/s RV Radial velocity
23- 26 F4.2 km/s e_RV Error on the radial velocity
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Note (1): The numbering system used for NGC 2354 is from:
Durbeck W. 1960ZA.....49..214D 1960ZA.....49..214D
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Acknowledgements: Jean-Claude Mermilliod
(End) Patricia Bauer [CDS] 22-Sep-1998