J/AJ/145/88 UBVRI photometry of M33 star clusters. II. (Ma, 2013)
New UBVRI photometry of 234 M33 star clusters.
Ma J.
<Astron. J., 145, 88 (2013)>
=2013AJ....145...88M 2013AJ....145...88M
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry, UBVRI
Keywords: catalogs - galaxies: individual: M33 - galaxies: spiral
Abstract:
This is the second paper of our series. In this paper, we present
UBVRI photometry for 234 star clusters in the field of M33. For most
of these star clusters, there is photometry in only two bands in
previous studies. The photometry of these star clusters is performed
using archival images from the Local Group Galaxies Survey, which
covers 0.8deg2 along the major axis of M33. Detailed comparisons
show that, in general, our photometry is consistent with previous
measurements, and in particular that our photometry is in good
agreement with that of Zloczewski & Kaluzny. Combined with star
cluster photometry in previous studies, we present some results: none
of the M33 youngest clusters (∼107yr) have masses approaching
105M☉, and comparisons with models of simple stellar
populations suggest a large range of ages for M33 star clusters and
some as old as the Galactic globular clusters.
Description:
Our sample star clusters are selected from Park & Lee (2007, cat.
J/AJ/134/2168), San Roman et al. (2009, cat. J/ApJ/699/839), and
Zloczewski & Kaluzny (2009, cat. J/AcA/59/47).
We used the Local Group Galaxies Survey (LGGS, Massey et al., 2006,
cat. J/AJ/131/2478) archival images of M33 in the UBVRI bands
(available from the ftp site
ftp://ftp.lowell.edu/pub/massey/lgsurvey/datarelease/) to perform the
photometry (see details in Paper I, Ma, 2012, cat. J/AJ/144/41).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 131 234 New UBVRI photometry of 234 M33 star clusters
table3.dat 131 277 UBVRI photometry of 277 M33 Star Clusters in
paper I (Ma, 2012, cat. J/AJ/144/41)
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See also:
J/AJ/144/41 : UBVRI photometry of M33 star clusters. I.
J/AcA/59/47 : HST photometry of M33 stellar clusters (Zloczewski+, 2009)
J/ApJ/699/839 : Newly identified star clusters in M33. II. (San Roman+, 2009)
J/AcA/58/23 : Photometry for M33 stellar clusters (Zloczewski+, 2008)
J/AJ/134/2168 : BVI photometry of M33 star clusters (Park+, 2007)
J/AJ/134/447 : Catalog of star cluster candidates in M 33 (Sarajedini+, 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)
ftp://ftp.lowell.edu/pub/massey/lgsurvey/datarelease/ : LGGS ftp site
Byte-by-byte Description of file: table[13].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/511] Running sequence number
5- 6 A2 --- --- [PL]
7- 9 I3 --- [PL2007] [1/242]? Identifier of the star cluster in
Park & Lee 2007 (J/AJ/134/2168)
11- 12 A2 --- --- [SM]
13- 15 I3 --- [SM2007] [3/449]? Identifier of the star cluster in
Sarajedini & Mancone 2007 (J/AJ/134/447)
17- 18 A2 --- --- [SR]
19- 21 I3 --- [SSG2009] [1/161]? Identifier of the star cluster in
San Roman et al. 2009 (J/ApJ/699/839)
23- 30 A8 --- ZK Identifier of the star cluster in Zloczewski &
Kaluzny 2008 or 2009 (1)
32- 33 I2 h RAh Hour of Right Ascension (J2000)
35- 36 I2 min RAm Minute of Right Ascension (J2000)
38- 43 F6.3 s RAs Second of Right Ascension (J2000)
44 A1 --- DE- Sign of Declination
45- 46 I2 deg DEd Degree of Declination (J2000)
48- 49 I2 arcmin DEm Arcminute of Declination (J2000)
51- 55 F5.2 arcsec DEs Arcsecond of Declination (J2000)
57- 62 F6.3 mag Umag [15.336/23.105]? The U band magnitude (2)
64- 68 F5.3 mag e_Umag ? Uncertainty in Umag
70- 75 F6.3 mag Bmag [16.076/23.243] The B band magnitude (2)
77- 81 F5.3 mag e_Bmag Uncertainty in Bmag
83- 88 F6.3 mag Vmag [15.626/22.556] The V band magnitude (2)
90- 94 F5.3 mag e_Vmag Uncertainty in Vmag
96-101 F6.3 mag Rmag [15.626/21.946] The Rc band magnitude (2)
103-107 F5.3 mag e_Rmag Uncertainty in Rmag
109-114 F6.3 mag Imag [14.806/22.153]? The Ic band magnitude (2)
116-120 F5.3 mag e_Imag ? Uncertainty in Imag
122-125 F4.2 mag E(B-V) [0.05/0.25] The (B-V) color excess (3)
127-131 F5.3 arcsec Aper [0.77/5.16] Aperture radius used in photometry
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Note (1): Zloczewski & Kaluzny 2009 (cat. J/AcA/59/47) for the ZK-NN objects,
and Zloczewski & Kaluzny 2008 (cat. J/AcA/58/23) for the FF-N-NNN objects.
Note (2): In the Johnson-Kron-Cousins system.
Note (3): Table 3 (objects 235 to 511 in column Seq) includes the reddening
values (from Park & Lee, 2007, cat. J/AJ/134/2168; and San Roman et al.,
2009, cat. J/ApJ/699/839) missed in Paper I (Ma, 2012, cat. J/AJ/144/41).
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History:
* 07-Apr-2014: from electronic version of the journal
* 13-Apr-2015: 53 possible repeated sources flagged from author
References:
Ma et al., Paper I, 2012AJ....144...41M 2012AJ....144...41M, cat. J/AJ/144/41
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 07-Apr-2014