J/AJ/137/94 Star clusters in M31 (Caldwell+, 2009)
Star clusters in M31. I. A catalog and a study of the young clusters.
Caldwell N., Harding P., Morrison H., Rose J.A., Schiavon R., Kriessler J.
<Astron. J., 137, 94-110 (2009)>
=2009AJ....137...94C 2009AJ....137...94C
ADC_Keywords: Galaxies, nearby ; Associations, stellar
Keywords: catalogs - galaxies: individual (M31) - galaxies: star clusters -
globular clusters: general
Abstract:
We present an updated catalog of 1300 objects in the field of M31,
including 670 likely star clusters of various types, the rest being
stars or background galaxies once thought to be clusters. The
coordinates in the catalog are accurate to 0.2", and are based on
images from the Local Group Survey (LGS) or from the Digitized Sky
Survey (DSS). Archival Hubble Space Telescope (HST) images and the LGS
were inspected to confirm cluster classifications where possible, but
most of the classifications are based on spectra taken of ∼1000
objects with the Hectospec fiber positioner and spectrograph on the
6.5m MMT.
Description:
The Hectospec multifiber positioner and spectrograph are ideally
suited for this project, in that its usable field is 1 deg in
diameter, and the instrument itself is mounted on the 6.5m MMT
telescope. We obtained data in observing runs in the years 2004-2007.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 660 Cleaned cluster catalog
table2.dat 66 141 Young clusters, ordered by mass
table3.dat 61 291 Stars
table4.dat 64 134 Possible stars
table5.dat 47 208 Galaxies
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See also:
J/AcA/48/455 : Globular Clusters in M31 and M33 (Mochejska+, 1998)
J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000)
J/AJ/122/2458 : M31 globular clusters from HST (Barmby+, 2001)
J/ApJ/559/851 : Young star cluster candidates in M31 (Williams+, 2001)
J/AJ/123/2490 : RV and [Fe/H] of M31 globular cluster system (Perrett+, 2002)
J/A+A/416/917 : M31 globular clusters Revised Bologna Catalog (Galleti+, 2004)
J/A+A/471/127 : New globular clusters in M31 (Galleti+, 2007)
J/PASP/119/7 : HST WFPC2 star clusters in M31 (Krienke+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Object name
18 A1 --- f_Name [defg] Discrepent classifications (1)
19- 20 I2 h RAh Hour of Right Ascension (J2000)
22- 23 I2 min RAm Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
30 A1 --- DE- Sign of Declination (J2000)
31- 32 I2 deg DEd Degree of Declination (J2000)
34- 35 I2 arcmin DEm Arcminute of Declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000)
42- 46 F5.2 mag Vmag ? V band magnitude
48- 51 F4.2 mag e_Vmag ? Uncertainty in Vmag
53- 58 A6 --- Type Rough age classification (2)
60- 61 A2 --- sV Source of velocity (3)
63- 66 F4.1 arcsec a_Vmag ? Aperture size for Vmag observation
68 A1 --- sP Source of photometry (G4)
70- 72 A3 --- sC Source of classification as cluster (5)
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Note (1): Flag on Name, defined as follows:
d = not a cluster in Barmby et al. (2000AJ....119..727B 2000AJ....119..727B, Cat. J/AJ/119/727)
e = not a cluster in Crampton et al. (1985ApJ...288..494C 1985ApJ...288..494C)
f = not a cluster in Racine (1991AJ....101..865R 1991AJ....101..865R)
g = Dubath & Grillmair (1997A&A...321..379D 1997A&A...321..379D) probably observed a different
object
Note (2): For objects with good quality spectra.
young = age less than 1Gyr
interm = age between 1 and 2Gyr
old = age greater than 2Gyr
Note (3): Source of velocity, defined as follows:
HS = this paper
B = Barmby et al. (2000AJ....119..727B 2000AJ....119..727B, Cat. J/AJ/119/727)
P = Perrett et al. (2002AJ....123.2490P 2002AJ....123.2490P, Cat. J/AJ/123/2490)
Note (5): objects with blank entries in this column and in the velocity source
column should still be considered "candidates". Flags as follows:
S = spectrum from this paper indicates a cluster
L = LGS image indicates non-stellar
H = HST image indicates a cluster
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Object name
19- 27 A9 --- f_Name Discrepent classification (1)
29- 32 F4.2 mag E(B-V) Reddening toward cluster
34- 39 F6.1 km/s Vel Cluster velocity
41- 42 I2 km/s e_Vel Uncertainty in Vel
44- 46 F3.1 [yr] logAge Log of cluster age
48- 50 F3.1 [Msun] logM Log of cluster mass
52- 54 F3.1 --- chi2 Fitting procedure χ2
56- 66 A11 --- Com Additional comment(s)
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Note (1): Flag on Name, defined as follows:
a = Not a cluster in Cohen et al. (2005ApJ...634L..45C 2005ApJ...634L..45C)
b = Star in field
c = Noted as young in van den Bergh (1969ApJS...19..145V 1969ApJS...19..145V)
d = Noted as young in Hodge (1979AJ.....84..744H 1979AJ.....84..744H)
e = Noted as young in Elson & Walterbos (1988ApJ...333..594E 1988ApJ...333..594E)
f = Noted as young in Barmby et al. (2000AJ....119..727B 2000AJ....119..727B, Cat. J/AJ/119/727)
g = Noted as young in Fusi Pecci et al. (2005AJ....130..554F 2005AJ....130..554F)
h = Noted as young in Burstein et al. (2004ApJ...614..158B 2004ApJ...614..158B)
i = Noted as young in Beasley et al. (2004AJ....128.1623B 2004AJ....128.1623B)
j = Noted as young in Williams & Hodge (2001ApJ...559..851W 2001ApJ...559..851W,
Cat. J/ApJ/559/851)
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Object name (1)
12 A1 --- f_Name [efgh] Discrepent classification (2)
14 I1 h RAh Hour of Right Ascension (J2000)
16- 17 I2 min RAm Minute of Right Ascension (J2000)
19- 23 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 41 F6.1 km/s Vel ? Velocity from Hectospec
43- 44 I2 km/s e_Vel ? Uncertainty in Vel
46- 50 F5.2 mag Vmag ? V band magnitude
52- 55 F4.2 mag e_Vmag ? Uncertainty in Vmag
57 A1 --- sP Source of photometry (G4)
59- 61 A3 --- sC Source of classification as a star (G5)
63- 64 A2 --- sV Source of velocity, only for table4.dat (3)
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Note (1): The suffix "x" indicates that coords correspond to a real object,
but which was wrongly identified in the initial input catalog.
Note (2): Flag on Name, defined as follows:
e = NB61 is an M star, the velocity of -646 listed in Galleti et al.
(2007A&A...471..127G 2007A&A...471..127G, Cat. J/A+A/471/127)
was likely the result of a velocity template mismatch.
f = Multiple stars or asterisms in M31.
g = The velocity of this F supergiant star indicates is it probably a
member of the M31 giant stream. Details to be presented in a
subsequent paper.
h = The colors of SK106A indicate it is an M star, the velocity of
-890 km/s reported in Kim et al. (2007AJ....134..706K 2007AJ....134..706K, Cat.
J/AJ/134/706) was likely the result of a velocity template mismatch
(see also Lee et al. 2008ApJ...674..886L 2008ApJ...674..886L).
Note (3): Source of velocity, defined as follows:
HS = this paper
B = Barmby et al. (2000AJ....119..727B 2000AJ....119..727B, Cat. J/AJ/119/727)
K = Kim et al. (2007, Cat. J/AJ/134/706)
P = Perrett et al. (2002AJ....123.2490P 2002AJ....123.2490P, Cat. J/AJ/123/2490)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Object name
17 A1 --- f_Name [b] Discrepent class (1)
19 I1 h RAh Hour of Right Ascension (J2000)
21- 22 I2 min RAm Minute of Right Ascension (J2000)
24- 28 F5.2 s RAs Second of Right Ascension (J2000)
29 A1 --- DE- Sign of Declination (J2000)
30- 31 I2 deg DEd Degree of Declination (J2000)
33- 34 I2 arcmin DEm Arcminute of Declination (J2000)
36- 39 F4.1 arcsec DEs Arcsecond of Declination (J2000)
41- 47 F7.5 --- z ? Hectospec redshift (2)
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Note (1): Perrett et al. (2002AJ....123.2490P 2002AJ....123.2490P, Cat. J/AJ/123/2490) had
velocity indicating M31 membership.
Note (2): All redshifts from Hectospec. Median velocity error is 17km/s.
Entries without redshifts were classified background based on images.
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Global Notes:
Note (G4): Source of photometry, defined as follows:
L = this paper;
B = Barmby et al. (2000AJ....119..727B 2000AJ....119..727B, Cat. J/AJ/119/727)
G = Galleti et al. (2007A&A...471..127G 2007A&A...471..127G, Cat. J/A+A/471/127)
H = Huxor et al. (2005MNRAS.360.1007H 2005MNRAS.360.1007H)
Note (G5): Source of classification as a star, defined as follows:
S = spectrum from this paper exists, indicates a star or is inconclusive
L = LGS image indicates stellar FWHM
B = Barmby et al. (2000AJ....119..727B 2000AJ....119..727B, Cat. J/AJ/119/727) indicated a star
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 22-Jun-2011