J/ApJS/211/22 Updated photometry for star clusters in M33 (Fan+, 2014)
Star clusters in M33: updated UBVRI photometry, ages, metallicities, and masses.
Fan Z., de Grijs R.
<Astrophys. J. Suppl. Ser., 211, 22 (2014)>
=2014ApJS..211...22F 2014ApJS..211...22F
ADC_Keywords: Abundances, [Fe/H] ; Photometry, UBVRI ; Clusters, globular ;
Galaxies, nearby
Keywords: catalogs; galaxies: individual: M33;
galaxies: star clusters: general; globular clusters: general
Abstract:
The photometric characterization of M33 star clusters is far from
complete. In this paper, we present homogeneous UBVRI photometry of
708 star clusters and cluster candidates in M33 based on archival
images from the Local Group Galaxies Survey, which covers 0.8deg2
along the galaxy's major axis. Our photometry includes 387, 563, 616,
580, and 478 objects in the UBVRI bands, respectively, of which 276,
405, 430, 457, and 363 do not have previously published UBVRI
photometry. Our photometry is consistent with previous measurements
(where available) in all filters. We adopted Sloan Digital Sky Survey
ugriz photometry for complementary purposes, as well as Two Micron All
Sky Survey near-infrared JHK photometry where available. We fitted the
spectral-energy distributions of 671 star clusters and candidates to
derive their ages, metallicities, and masses based on the updated
PARSEC simple stellar populations synthesis models. The results of our
χ2 minimization routines show that only 205 of the 671 clusters
(31%) are older than 2Gyr, which represents a much smaller fraction of
the cluster population than that in M31 (56%), suggesting that M33 is
dominated by young star clusters (<1Gyr).
Description:
Our sample star clusters are mainly selected from San Roman et al.
(2010, Cat. J/ApJ/720/1674), whose database is based on observations
with the CFHT/MegaCam camera. To supplement these data, we also
include 120 confirmed star clusters from the updated (2010) version of
Sarajedini & Mancone (2007, Cat. J/AJ/134/447), which were not
included in San Roman et al.
We used archival UBVRI images from the LGGS (Local Group Galaxies
Survey; Massey et al. 2006, Cat. J/AJ/131/2478), which covers a region
of 0.8deg2 along the galaxy's major axis. The observations were
taken with the Kitt Peak National Observatory 4m Telescope between
2000 August and 2002 September.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 708 New UBVRI photometry of M33 clusters
table2.dat 44 671 Ages, metallicities, and masses of the M33 star
clusters
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See also:
J/AJ/145/88 : UBVRI photometry of M33 star clusters. II. (Ma, 2013)
J/AJ/144/41 : UBVRI photometry of M33 star clusters. I. (Ma+, 2012)
J/MNRAS/426/2427 : Structural param. of M33 star clusters (San Roman+, 2012)
J/ApJ/720/1674 : CFHT M33 extended sources catalog (San Roman+, 2010)
J/ApJ/700/103 : Ages of star clusters in M33 (Park+, 2009)
J/ApJ/699/839 : Newly identified star clusters in M33. II. (San Roman+, 2009)
J/AcA/59/47 : HST photometry of M33 stellar clusters (Zloczewski+, 2009)
J/AcA/58/23 : Phot. survey for M33 stellar clusters (Zloczewski+, 2008)
J/AJ/134/447 : Cat. of star cluster candidates in M 33 (Sarajedini+, 2007)
J/AJ/134/2168 : BVI photometry of M33 star clusters (Park+, 2007)
J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)
J/A+A/444/831 : New star clusters in M33 (Bedin+, 2005)
J/A+A/366/498 : VI photometry of M33 star clusters (Chandar+, 2001)
J/ApJS/122/431 : Star Clusters in M33 (Chandar+, 1999)
J/AcA/48/455 : Globular Clusters in M31 and M33 (Mochejska+, 1998)
http://www.mancone.net/m33_catalog/ : Online M33 cluster catalog
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running sequence number from this paper
5- 8 I4 --- SRID ? San Roman et al. identifier (1)
10- 12 I3 --- SMID ? Updated 2010 version of Sarajedini &
Mancone (2007, Cat. J/AJ/134/447;
<[SM2007] NNN> in Simbad) cluster catalog ID (2)
14- 19 F6.3 mag Umag [15.61/21.62]? The KPNO Johnson U band magnitude
21- 25 F5.3 mag e_Umag [0.02/0.08]? Uncertainty in Umag
27- 32 F6.3 mag Bmag [16.01/21.66]? The KPNO Johnson B band magnitude
34- 38 F5.3 mag e_Bmag [0.01/0.06]? Uncertainty in Bmag
40- 45 F6.3 mag Vmag [15.28/21.19]? The KPNO Johnson V band magnitude
47- 51 F5.3 mag e_Vmag [0.01/0.06]? Uncertainty in Vmag
53- 58 F6.3 mag Rmag [14.87/20.76]? The KPNO Cousins R band magnitude
60- 64 F5.3 mag e_Rmag [0.01/0.05]? Uncertainty in Rmag
66- 71 F6.3 mag Imag [14.72/20.56]? The KPNO Cousins I band magnitude
73- 77 F5.3 mag e_Imag [0.02/0.09]? Uncertainty in Imag
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Note (1): San Roman et al., 2010, Cat. J/ApJ/720/1674;
<[SSA2010] NNNN> in Simbad.
Note (2): http://www.mancone.net/m33_catalog/
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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- 2 A2 --- Cat SR/SM for the catalog origin (1)
3- 6 I4 --- ID Object identifier number (1)
8- 13 F6.3 Gyr Age [0.004/12.6] Cluster age
15- 19 F5.3 Gyr e_Age [0.001/4.1] Uncertainty in Age
21- 26 F6.3 [Sun] [Fe/H] [-2.4/0.5] Metallicity
28- 32 F5.3 [Sun] e_[Fe/H] [0.04/1.4] Uncertainty in [Fe/H]
34- 38 F5.3 [Msun] logM [2.2/6.7]? Log cluster mass
40- 44 F5.3 [Msun] e_logM [0/1.1]? Uncertainty in logM
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Note (1): Catalog as follows:
SR = San Roman et al., 2010, Cat. J/ApJ/720/1674;
<[SSA2010] NNNN> in Simbad
SM = Updated 2010 version of Sarajedini & Mancone (2007, Cat. J/AJ/134/447;
<[SM2007] NNN> in Simbad; http://www.mancone.net/m33_catalog/).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-May-2014