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J/A+A/491/951    Positions and cross-references in Coma Ber   (Mermilliod+ 2008)

Membership, binarity and rotation of red dwarfs in the nearby open cluster Coma Berenices (Melotte 111). Mermilliod J.-C., Grenon M., Mayor M. <Astron. Astrophys. 491, 951 (2008)> =2008A&A...491..951M
ADC_Keywords: Clusters, open ; Radial velocities Keywords: Galaxy: open clusters and associations: individual: Coma Berenices (Melotte 111) - stars: binaries: spectroscopic - technique: radial velocities Abstract Although several attempts were made to identify solar-type members on the main sequence of the nearby open cluster Coma Berenices (Mel 111), the population of the lower main sequence is still poorly known. We observed 46 new candidates to search for new members and monitored known spectroscopic-binary members to determine orbital parameters. We obtained a total of 903 radial-velocity measurements of 69 solar-type stars in the field of Mel 111 with the CORAVEL spectrovelocimeter over 20 years. Among the 35 stars from Trumpler's list, 23 are members according to their radial velocities and photometry. We were able to confirm the membership of only 8 stars among the 46 candidates observed. Six double-lined and ten single-lined spectroscopic binaries were discovered. Six only are members and an orbit was determined for them and for 4 double-lined non-members. The binary frequency is 22% (7/32). The cluster mean radial velocity is +0.01±0.08km/s based on 28 members. The lower main sequence of the Coma Berenices open cluster is still rather poorly populated. The cluster size may be much larger that usually accepted. Accordingly extensive programmes of precise proper motions, radial velocities and photometry should be undertaken to identify faint cluster members outside the cluster central area. If a significant population of faint members cannot be identified, Coma Ber could be a prominent example of dynamical evolution leading to star evaporation. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 114 42 Coordinates and cross-references
See also: J/MNRAS/365/447 : New members of Coma Berenices cluster (Casewell+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- WEBDA Star designation (WEBDA number) 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 19 A1 --- DE- Declination sign (J2000) 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 29 F4.1 arcsec DEs Declination (J2000) 32- 37 F6.3 --- [M60b] ? Identification Malmquist (1927 Lunds Medd.II No 37, 1936StoAn..12g...1M), DD.NNN = [M60b] +DD NNN in Simbad 40- 43 I4 --- Art ? Identification Artyukhina (1955TrSht..26....3A) Arty NNNN in Simbad 46- 51 F6.3 --- Upg ? Identification Upgren (1962AJ.....67...37U, Cat. III/10) DD.NNN = NGP DD NNN in Simbad 54- 58 A5 --- [A63] Identification Argue (1963MNRAS.127...97A), NN-NNN = [A63] NN NNN in Simbad 61- 64 I4 --- Abad ? Identification Abad & Vicente (1999, Cat. J/A+AS/136/307, Cl* Melotte 111 AV NNNN) 67- 74 F8.4 --- BD ? Identification Bonner Durchmusterung (I/122) 77-114 A38 --- IDs Various identifications (1)
Note (1): Acronyms are: Tr = Trumpler (1938LicOB..18..167T) Cl Melotte 111 T ANN in Simbad J = Casewell (2006, Cat. J/MNRAS/365/447C) [CJD2006] in Simbad Bou = Bounatiro (1993A&AS..100..531B) Cl* Melotte 111 Bou NN in Simbad
Acknowledgements: Jean-Claude Mermilliod, Jean-Claude.Mermilliod(at)
(End) Jean-Claude Mermilliod 20-Aug-2008
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