J/AJ/149/56 Masses and photometry of 304 M31 old star clusters (Ma+, 2015)
Spectral energy distributions and masses of 304 M31 old star clusters.
Ma J., Wang S., Wu Z., Zhang T., Zou H., Nie J.D., Zhou Z., Zhou X., Wu J.,
Du C., Yuan Q.
<Astron. J., 149, 56 (2015)>
=2015AJ....149...56M 2015AJ....149...56M
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry
Keywords: catalogs - galaxies: individual: M31 - galaxies: spiral -
galaxies: star clusters: general
Abstract:
This paper presents CCD multicolor photometry for 304 old star
clusters in the nearby spiral galaxy M31, from which the photometry of
55 star clusters is first obtained. The observations were carried out
as a part of the Beijing-Arizona-Taiwan-Connecticut Multicolor Sky
Survey from 1995 February to 2008 March, using 15 intermediate-band
filters covering 3000-10000Å. Detailed comparisons show that our
photometry is in agreement with previous measurements. Based on the
ages and metallicities from Caldwell et al. and the photometric
measurements here, we estimated the clusters' masses by comparing
their multicolor photometry with stellar population synthesis models.
The results show that the sample clusters have masses between
∼3x104M☉ and ∼107M☉ with a peak of ∼4x105M☉.
The masses here are in good agreement with those in previous studies.
Combined with the masses of young star clusters of M31 from Wang et
al., we find that the peak mass of the old clusters is 10 times that
of young clusters.
Description:
In the Table 1, we present CCD multicolor photometry in 15
intermediate-band filters for 304 old star clusters in the field of
M31 based on images observed by the Beijing-Arizona-Taipei-Connecticut
(BATC) Multicolor Sky Survey (Zhou et al., 1995-2005, cat. II/262). In
the Table 2, we estimated the masses of these sample star clusters.
The sample of star clusters in this paper is from Caldwell et al. 2011
(cat. J/AJ/141/61).
The M31 field is part of a galaxy calibration program of the BATC
Multicolor Sky Survey. The BATC program uses the 60/90cm Schmidt
Telescope at the Xinglong Station of the National Astronomical
Observatories, Chinese Academy of Sciences. This system includes 15
intermediate-band filters, covering a wavelength range from 3000 to
10000Å (see Fan et al. 1996, cat. J/AJ/112/628, for details).
Before 2006 February, a Ford Aerospace 2k*2k thick CCD camera was
applied, which has a pixel size of 15µm and a field of view of
58'*58', resulting in a resolution of 1.67''/pixel. After 2006
February, a new 4k*4k CCD with a pixel size of 12µm was used with a
resolution of 1.36''/pixel (Fan et al., 2009RAA.....9..993F 2009RAA.....9..993F). We
obtained 143.9 hours of imaging of the M31 field covering about 6
square degrees, consisting of 447 images, through the set of 15
filters in 5 observing runs from 1995 to 2008, spanning 13 years (see
Fan et al., 2009RAA.....9..993F 2009RAA.....9..993F, for details).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 211 304 BATC photometry of 304 M31 old star clusters
table2.dat 83 297 Masses of 297 M31 old star clusters
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See also:
V/143 : Revised Bologna Catalog of M31 clusters, V.5 (Galleti+ 2012)
II/262 : BATC Data Release One - BATC DR1 (Zhou+ 1995-2005)
J/ApJS/199/37 : GALEX catalog of star clusters in M31 (Kang+, 2012)
J/AJ/144/191 : Multicolor photometry of 135 clusters in M31 (Wang+, 2012)
J/AJ/141/61 : Star clusters in M31. II. (Caldwell+, 2011)
J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010)
J/ApJ/725/200 : An updated catalog of M31 globular-like clusters (Fan+, 2010)
J/AJ/139/1438 : SED + age estimates of M31 globular clusters (Wang+, 2010)
J/ApJ/703/1872 : Compact star clusters in the M31 disk (Vansevicius+, 2009)
J/A+A/508/1285 : Metallicity of M31 globular clusters (Galleti+, 2009)
J/AJ/138/1667 : HST survey of young clusters in M31. III. (Barmby+, 2009)
J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009)
J/AJ/134/706 : New globular clusters in M 31 (Kim+, 2007)
J/AJ/133/2764 : M31 globular clusters structural parameters (Barmby+, 2007)
J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)
J/A+A/456/985 : RVs of 76 M31 candidate clusters (Galleti+, 2006)
J/A+A/449/143 : Photometry of M31 globular cluster candidates (Ma+, 2006)
J/A+A/397/361 : 15-color BATC photometry of Landolt SA95 field (Zhou+, 2003)
J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000)
J/AJ/112/628 : BATC Color Survey of M67 (Fan+ 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of the old star cluster (G1)
12- 17 F6.3 mag amag ? BATC a-band magnitude (1)
19- 23 F5.3 mag e_amag ? 1σ DAOPHOT uncertainty in amag
25- 30 F6.3 mag bmag ? BATC b-band magnitude (1)
32- 36 F5.3 mag e_bmag ? 1σ DAOPHOT uncertainty in bmag
38- 43 F6.3 mag cmag ? BATC c-band magnitude (1)
45- 49 F5.3 mag e_cmag ? 1σ DAOPHOT uncertainty in cmag
51- 56 F6.3 mag dmag ? BATC d-band magnitude (1)
58- 62 F5.3 mag e_dmag ? 1σ DAOPHOT uncertainty in dmag
64- 69 F6.3 mag emag ? BATC e-band magnitude (1)
71- 75 F5.3 mag e_emag ? 1σ DAOPHOT uncertainty in emag
77- 82 F6.3 mag fmag ? BATC f-band magnitude (1)
84- 88 F5.3 mag e_fmag ? 1σ DAOPHOT uncertainty in fmag
90- 95 F6.3 mag gmag BATC g-band magnitude (1)
97-101 F5.3 mag e_gmag 1σ DAOPHOT uncertainty in gmag
103-108 F6.3 mag hmag ? BATC h-band magnitude (1)
110-114 F5.3 mag e_hmag ? 1σ DAOPHOT uncertainty in hmag
116-121 F6.3 mag imag ? BATC i-band magnitude (1)
123-127 F5.3 mag e_imag ? 1σ DAOPHOT uncertainty in imag
129-134 F6.3 mag jmag ? BATC j-band magnitude (1)
136-140 F5.3 mag e_jmag ? 1σ DAOPHOT uncertainty in jmag
142-147 F6.3 mag kmag ? BATC k-band magnitude (1)
149-153 F5.3 mag e_kmag ? 1σ DAOPHOT uncertainty in kmag
155-160 F6.3 mag mmag ? BATC m-band magnitude (1)
162-166 F5.3 mag e_mmag ? 1σ DAOPHOT uncertainty in mmag
168-173 F6.3 mag nmag ? BATC n-band magnitude (1)
175-179 F5.3 mag e_nmag ? 1σ DAOPHOT uncertainty in nmag
181-186 F6.3 mag omag ? BATC o-band magnitude (1)
188-192 F5.3 mag e_omag ? 1σ DAOPHOT uncertainty in omag
194-199 F6.3 mag pmag ? BATC p-band magnitude (1)
201-205 F5.3 mag e_pmag ? 1σ DAOPHOT uncertainty in pmag
207-211 F5.2 arcsec Aper Aperture radius
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Note (1): BATC=Beijing-Arizona-Taipei-Connecticut (multicolor sky survey;
Zhou et al., 1995-2005, cat. II/262). The photometry of some clusters
are not present, due to:
* some sample clusters fall in the edges of the images,
* B124-NB 10 is saturated in the i-filter image
* B156-G211 and B515 fall in the bleeding CCD column of a saturated star
in the i-filter image.
* there is a bright source near B231-G285 in the b-filter image.
* low S/N (mainly in the a and b bands)
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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- 10 A10 --- Name Name of the old star cluster (G1)
12- 15 F4.2 [Msun] logMU ? Log mass from U band observations (2)
17- 20 F4.2 [Msun] e_logMU ? 1σ uncertainty in logMU
22- 25 F4.2 [Msun] logMB ? Log mass from B band observations (2)
27- 30 F4.2 [Msun] e_logMB ? 1σ uncertainty in logMB
32- 35 F4.2 [Msun] logMV ? Log mass from V band observations (2)
37- 40 F4.2 [Msun] e_logMV ? 1σ uncertainty in logMV
42- 45 F4.2 [Msun] logMR ? Log mass from R band observations (2)
47- 50 F4.2 [Msun] e_logMR ? 1σ uncertainty in logMR
52- 55 F4.2 [Msun] logMI ? Log mass from I band observations (2)
57- 60 F4.2 [Msun] e_logMI ? 1σ uncertainty in logMI
62- 65 F4.2 [Msun] <logM> Log average mass
67- 70 F4.2 [Msun] e_<logM> Uncertainty in <logM>
72- 78 F7.3 mag VMag [-11.8/-5.2]? Absolute V band magnitude
80- 83 F4.2 mag E(B-V) The (B-V) color excess
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Note (2): We estimate the masses by comparing homogenous photometry obtained
here with stellar population synthesis models. We use the GALEV Simple
Stellar Population (SSP) models (e.g., Kurth et al., 1999A&AS..138...19K 1999A&AS..138...19K;
Schulz et al. 2002, cat. J/A+A/392/1; Anders & Fritze-v. Alvensleben;
2003A&A...401.1063A 2003A&A...401.1063A) for our estimates. The GALEV models provide absolute
magnitudes (in the Vega system) in 77 bands for Simple Stellar Populations
(SSPs) of 106M☉, including Johnson UBVRI.
See Section 3 for further details.
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Global Notes:
Note (G1): Following the naming convention of Caldwell et al. 2011
(cat. J/AJ/141/61).
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 24-Feb-2015