J/MNRAS/365/447 New stellar members of Coma Berenices cluster (Casewell+, 2006)
New stellar members of the Coma Berenices open star cluster.
Casewell S.L., Jameson R.F., Dobbie P.D.
<Mon. Not. R. Astron. Soc., 365, 447-453 (2006)>
=2006MNRAS.365..447C 2006MNRAS.365..447C
ADC_Keywords: Clusters, open ; Photometry, infrared ; Proper motions
Keywords: open clusters and associations: individual: Coma Berenices -
open clusters and associations: individual: Melotte 111
Abstract:
We present the results of a survey of the Coma Berenices open star
cluster (Melotte 111), undertaken using proper motions from the
USNO-B1.0 (United States Naval Observatory, I/284) and photometry
from the Two-Micron All-Sky Survey (2MASS, II/246) Point Source
catalogues. We have identified 60 new candidate members with masses in
the range 1.007<M<0.269M☉. For each we have estimated a
membership probability by extracting control clusters from the proper
motion vector diagram. All 60 are found to have greater than 60 per
cent probability of being members, more than doubling the number of
known cluster members. The new luminosity function for the cluster
peaks at bright magnitudes, but is rising at K≫12, indicating that it
is likely that lower mass members may exist. The mass function also
supports this hypothesis.
Description:
Our survey of the Coma Berenices open cluster has recovered 45
previously known members in total, 38 listed by Bounatiro & Arimoto
(1992A&A...260..112B 1992A&A...260..112B) and seven unearthed by Odenkirchen et al.
(1998NewA....3..583O 1998NewA....3..583O). Furthermore, it has identified 60 new candidate
cluster members with magnitudes down to Ks=12.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 105 45 *Data for known cluster members
table2.dat 105 60 *Data for the 60 possible members
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Note on table1.dat and table2.dat: Name, coordinates, proper motion
measurements, R, I, J, H and Ks magnitudes for the known cluster members
(table1) as detailed in Bounatiro & Arimoto (1992A&A...260..112B 1992A&A...260..112B) and
Odenkirchen et al. (1998NewA....3..583O 1998NewA....3..583O) for the area that we surveyed. The
masses were calculated by linearly interpolating the models of Girardi et al.
(2002A&A...391..195G 2002A&A...391..195G) for M≥1M_☉ or Baraffe et al. (1998, Cat.
J/A+A/337/403) for M<1M_☉.
For table2, coordinates, proper motion measurements, R, I, J, H and Ks
magnitudes, mass calculated from linearly interpolating the NEXTGEN model and
the absolute Ks magnitude, and the probability of membership for each of
our 60 possible members.
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See also:
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+AS/136/307 : Coma Berenices astrometric catalogue (Abad+ 1999)
J/A+AS/146/251 : Open clusters absolute proper motions. I. (Baumgardt+, 2000)
J/A+A/345/471 : Memberships of open clusters (Robichon+, 1999)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Name (1)
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 31 F5.2 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 43 F4.1 arcsec DEs Declination (J2000)
45- 49 F5.1 mas/yr pmRA Proper motion along right ascension
51- 55 F5.1 mas/yr pmDE Proper motion along declination
57- 59 F3.1 mas/yr e_pmRA ?=0.0 rms uncertainty on pmRA
61- 64 F4.1 mas/yr e_pmDE ?=0.0 rms uncertainty on pmDE
66- 70 F5.2 mag Rmag USNO-B1.0 R magnitude
72- 76 F5.2 mag Imag ?=0.0 USNO-B1.0 I magnitude
78- 82 F5.2 mag Jmag 2MASS J magnitude
84- 88 F5.2 mag Hmag 2MASS H magnitude
90- 94 F5.2 mag Ksmag 2MASS Ks magnitude
96-100 F5.3 solMass Mass Stellar Mass
102-105 F4.2 % Pmemb Membership probability
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Note (1): In table1: known names
In table2: names constructed by CDS from positions,
identified as [CJD2006] JHHMMSS.ss+DDMMSS.s in Simbad
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-May-2006