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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
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: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 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 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 45 276 CORAVEL radial-velocity data
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
Bytes Format Units Label Explanations
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
Note (1): Numbering systems used : NGC 2324 : Cuffey J., 1941ApJ....94...55C, NGC 2324 NNNa in Simbad NGC 2818 : Pedreros M., 1989AJ.....98.2146P (No < 1000) Tifft W.G. et al. 1972MNRAS.158...47T (No > 1000) NGC 2818 NNNN in Simbad NGC 3960 : Janes K.A., 1981AJ.....86.1210J, NGC 3960 NNN in Simbad NGC 6259 : Hawarden T.G., 1974MNRAS.169..539H, NGC 6259 NNNN in Simbad See the WEBDA database (http://obswww.unige.ch/webda/navigation.html) for cross-identifications.
Acknowledgements: Jean-Claude Mermilliod References: Mermilliod & Mayor, Paper I 1989A&A...219..125M Mermilliod et al., Paper II 1989A&AS...79...11M Mermilliod & Mayor, Paper III 1990A&A...237...61M Mermilliod et al., Paper IV 1995A&A...299...53M, Cat. J/A+A/299/53 Mermilliod et al., Paper V 1996A&A...307...80M, Cat. J/A+A/307/80 Mermilliod et al., Paper VI 1997A&A...319..481M, Cat. J/A+A/319/481 Mermilliod et al., Paper VII 1997A&A...324...91M, Cat. J/A+A/324/91 Mermilliod et al., Paper VIII 1998A&A...339..423M, Cat. J/A+A/339/423
(End) [jcm] 18-Jul-2001
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