J/A+A/375/30 Radial velocities in open clusters (Mermilliod+, 2001)
Red giants in open clusters: IX. NGC 2324, 2818, 3590 and 6259
Mermilliod J.-C., Claria J.J., Andersen J., Piatti A.E., Mayor M.
<Astron. Astrophys. 375, 30 (2001)>
=2001A&A...375...30M 2001A&A...375...30M
ADC_Keywords: Clusters, open ; Stars, giant ; Radial velocities
Keywords: cluster: open - individual: NGC 2324, NGC 2818, NGC 3960, NGC 6259 -
binary: spectroscopic - star: evolution - star: red giant
Abstract:
We present accurate radial velocities and photoelectric UBV photometry
for 73 and 57 red-giant candidates, respectively, in the
intermediate-age open clusters NGC 2324, 2818, 3960 and 6259. These
data confirm the membership of 47 stars, 12 of which (26% ) are
spectroscopic binaries; three preliminary orbits have been determined
in NGC 3960. From Washington photometry of 8 red giant members, the
metallicity of NGC 6259 is found to be [Fe/H]=0.06±0.08. At the age
of these clusters, most of the red giants are observed in the
core-helium (clump) burning phase, the general morphology of which is
well reproduced by theoretical models with convective overshooting.
However, a number of bona fide cluster giant members are found
significantly to the red of the isochrones fitting the rest of the CMD
of these and a few other clusters. Some of these stars are binaries,
but others seem to be single. In either case, their red colours and/or
low luminosities remain unexplained by current stellar evolution
theory.
Objects:
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RA (2000) DE Designation(s)
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07 04 12 +01 03 00 NGC 2324
09 16 01.5 -36 37 37 NGC 2818
11 12 54 -60 47 00 NGC 3590
17 00 42 -44 40 00 NGC 6259
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 276 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 : Radial velocities of 10 spect. binaries (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+AS/134/301 : NGC 2354 red giants (Claria+ 1999)
J/A+A/423/189 : NGC 2477 red giants UBV phot. & RV (Eigenbrod+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
11- 14 I4 --- Star Star number (1)
18- 28 F11.3 d HJD Heliocentric Julian Date
32- 38 F7.2 km/s RV Radial velocity
42- 45 F4.2 km/s e_RV Error on the radial velocity
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Note (1): Numbering systems used :
NGC 2324 : Cuffey J., 1941ApJ....94...55C 1941ApJ....94...55C, NGC 2324 NNNa in Simbad
NGC 2818 : Pedreros M., 1989AJ.....98.2146P 1989AJ.....98.2146P (No < 1000)
Tifft W.G. et al. 1972MNRAS.158...47T 1972MNRAS.158...47T (No > 1000)
NGC 2818 NNNN in Simbad
NGC 3960 : Janes K.A., 1981AJ.....86.1210J 1981AJ.....86.1210J, NGC 3960 NNN in Simbad
NGC 6259 : Hawarden T.G., 1974MNRAS.169..539H 1974MNRAS.169..539H, NGC 6259 NNNN in Simbad
See the WEBDA database (http://obswww.unige.ch/webda/navigation.html)
for cross-identifications.
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Acknowledgements: Jean-Claude Mermilliod
References:
Mermilliod & Mayor, Paper I 1989A&A...219..125M 1989A&A...219..125M
Mermilliod et al., Paper II 1989A&AS...79...11M 1989A&AS...79...11M
Mermilliod & Mayor, Paper III 1990A&A...237...61M 1990A&A...237...61M
Mermilliod et al., Paper IV 1995A&A...299...53M 1995A&A...299...53M, Cat. J/A+A/299/53
Mermilliod et al., Paper V 1996A&A...307...80M 1996A&A...307...80M, Cat. J/A+A/307/80
Mermilliod et al., Paper VI 1997A&A...319..481M 1997A&A...319..481M, Cat. J/A+A/319/481
Mermilliod et al., Paper VII 1997A&A...324...91M 1997A&A...324...91M, Cat. J/A+A/324/91
Mermilliod et al., Paper VIII 1998A&A...339..423M 1998A&A...339..423M, Cat. J/A+A/339/423
(End) [jcm] 18-Jul-2001