J/AJ/144/41 UBVRI photometry of M33 star clusters. I. (Ma+, 2012)
An updated catalog of M33 clusters and candidates:
UBVRI photometry and some statistical results.
Ma J.
<Astron. J., 144, 41 (2012)>
=2012AJ....144...41M 2012AJ....144...41M
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry, UBVRI
Keywords: catalogs - galaxies: individual (M33) - galaxies: spiral -
galaxies: star clusters: general
Abstract:
We present UBVRI photometry for 392 star clusters and candidates in
the field of M33, which are selected from the most recent star cluster
catalog. In this catalog, the authors listed star clusters' parameters
such as cluster positions, magnitudes, colors in the
UBVRIJHKsfilters, and so on. However, a large fraction of objects in
this catalog do not have previously published photometry. Photometry
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. Positions (right ascension and declination) for
some clusters are corrected here. Combined with previous literature,
ours constitute a large sample of M33 star clusters. Based on this
cluster sample, we present some statistical results: none of the
youngest M33 clusters (∼107yr) have masses approaching 105M☉;
roughly half the star clusters are consistent with the
104-105M☉ mass models; the continuous distribution of star
clusters along the model line indicates that M33 star clusters have
been formed continuously from the epoch of the first star cluster
formation until recent times; and there are ∼50 star clusters which
are overlapped with the Galactic globular clusters on the color-color
diagram, and these clusters are old globular cluster candidates in
M33.
Description:
We selected our sample star clusters and cluster candidates from the
M33 adopted cluster catalog of Sarajedini & Mancone (2007,
Cat. J/AJ/134/447).
To perform our aperture photometry, we used archival UBVRI images of
M33 from the Local Group Galaxies Survey (LGGS, Massey et al., 2006,
Cat. J/AJ/131/2478) available from their ftp site
(ftp://ftp.lowell.edu/pub/massey/lgsurvey/datarelease/). The
observations were taken from 2000 August to 2002 September with the
KPNO 4m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 392 New UBVRI photometry of M33 star clusters and
candidates
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See also:
J/ApJ/720/1674 : CFHT M33 extended sources catalog (San Roman+, 2010)
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 : Photometric survey of 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/AJ/121/870 : BVI photometry of Variables in M33 (Macri+, 2001)
J/AJ/121/861 : BVI photometry of central part of M33 (Macri+, 2001)
J/ApJS/122/431 : Star Clusters in M33 (Chandar+, 1999)
J/AcA/48/455 : Globular Clusters in M31 and M33 (Mochejska+, 1998)
J/AJ/110/1649 : HST VI photometry near the M33 nucleus (Mighell+ 1995)
J/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995)
ftp://ftp.lowell.edu/pub/massey/lgsurvey/datarelease/ : LGGS ftp site
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [SM2007] Running sequence number
<[SM2007] NNN> in Simbad
5- 10 F6.3 mag Umag [15.336/23.105]? The Johnson-Kron-Cousins
U band magnitude (Vega system)
12- 16 F5.3 mag e_Umag ? Uncertainty in Umag
18- 23 F6.3 mag Bmag [16.0/23.3] The Johnson-Kron-Cousins
B band magnitude (Vega system)
25- 29 F5.3 mag e_Bmag Uncertainty in Bmag
31- 36 F6.3 mag Vmag [15.8/22.6] The Johnson-Kron-Cousins
V band magnitude (Vega system)
38- 42 F5.3 mag e_Vmag Uncertainty in Vmag
44- 49 F6.3 mag Rmag [15.6/22.0] The Johnson-Kron-Cousins
R band magnitude (Vega system)
51- 55 F5.3 mag e_Rmag Uncertainty in Rmag
57- 62 F6.3 mag Imag [14.8/22.2] The Johnson-Kron-Cousins
I band magnitude (Vega system)
64- 68 F5.3 mag e_Imag Uncertainty in Imag
70- 74 F5.3 arcsec Aper [0.7/5.2] Aperture radius
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History:
From electronic version of the journal
References:
Ma et al., Paper II, 2013AJ....145...88M 2013AJ....145...88M, cat J/AJ/145/88
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 01-Oct-2013