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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 42 Coordinates and cross-references
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See also:
J/MNRAS/365/447 : New members of Coma Berenices cluster (Casewell+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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 1936StoAn..12g...1M),
DD.NNN = [M60b] +DD NNN in Simbad
40- 43 I4 --- Art ? Identification Artyukhina
(1955TrSht..26....3A 1955TrSht..26....3A) Arty NNNN in Simbad
46- 51 F6.3 --- Upg ? Identification Upgren (1962AJ.....67...37U 1962AJ.....67...37U,
Cat. III/10) DD.NNN = NGP DD NNN in Simbad
54- 58 A5 --- [A63] Identification Argue (1963MNRAS.127...97A 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)
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Note (1): Acronyms are:
Tr = Trumpler (1938LicOB..18..167T 1938LicOB..18..167T) Cl Melotte 111 T ANN in Simbad
J = Casewell (2006, Cat. J/MNRAS/365/447C)
[CJD2006] JHHMMSS.ss+DDMMSS.s in Simbad
Bou = Bounatiro (1993A&AS..100..531B 1993A&AS..100..531B) Cl* Melotte 111 Bou NN in Simbad
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Acknowledgements:
Jean-Claude Mermilliod, Jean-Claude.Mermilliod(at)obs.unige.ch
(End) Jean-Claude Mermilliod 20-Aug-2008