J/AcA/59/47 HST photometry of M33 stellar clusters (Zloczewski+, 2009)
Photometric survey of stellar clusters in the outer part of M33.
II. Analysis of HST/ACS images.
Zloczewski K., Kaluzny J.
<Acta Astron., 59, 47-67 (2009)>
=2009AcA....59...47Z 2009AcA....59...47Z
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry, HST
Keywords: catalogs - galaxies: individual: M33 - galaxies: star clusters
Abstract:
We have used deep ACS/WFC images of M33 to check the nature of
extended objects detected by the ground based survey of Zloczewski et
al. (2008, Cat. J/AcA/58/23). A total of 24 candidates turned out to
be genuine compact stellar clusters. In addition we detected 91 new
clusters. Equatorial coordinates, integrated magnitudes and angular
sizes are listed for all 115 objects. Forty-two clusters have
sufficiently red colors to be candidates for old globulars. For four
clusters we extracted resolved stellar photometry. Object 33-3-018
located in the outer disk of M33 turned out to be a young cluster with
an age estimated at 200-350Myr. Cluster ZK-90 has an age of 3-5Gyr.
The remaining two clusters have intermediate ages ranging from one to
a few Gyr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 23 95 New classification of 95 objects from the ZKH
(Cat. J/AcA/58/23) catalog
table2.dat 64 115 Properties of 115 stellar clusters from M33
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See also:
J/AcA/58/23 : Photometric survey for M33 stellar clusters (Zloczewski+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- ZHK Identification Cat. J/AcA/58/23 (2008)
<[ZHK2008] NN-N-NNN> in Simbad
10- 18 A9 --- Set HST dataset
20 I1 --- ZHKtype [-1/1] ZHK type (1)
22- 23 I2 -- HSTtype [-1/1] HST type (1)
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Note (1): Object types have the following meaning:
-1 = galaxy
0 = unclassified
1 = probable cluster. Objects with HST type set to 1 can be
considered certain clusters.
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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- 8 A8 --- Name Name (1)
10- 17 F8.5 deg RAdeg Right ascension in decimal degrees (J2000.0)
19- 26 F8.5 deg DEdeg Declination in decimal degrees (J2000.0)
28- 36 A9 --- Set HST dataset
38- 42 F5.2 mag F475W ?=- HST F475W magnitude (Vega)
44- 48 F5.2 mag F606W ?=- HST F606W magnitude (Vega)
50- 54 F5.2 mag F814W ?=- HST F814W magnitude (Vega)
56- 59 F4.2 arcsec ap ?=- Aperture radius used for extraction of
integrated photometry (2)
61- 64 F4.1 arcsec d Projected distance from the center of M33 (3)
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Note (1): Source designated as NN-N-NNN ([ZKH2008] NN-N-NNN) or
KZ-NN ([ZK2009] NN)
Note (2): Its value is equal to the estimated angular radius of a given cluster.
Note (3): Projected distance from the center of M33 = 023.46212+30.66028 (J2000)
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History:
From electronic version of the journal
References:
Zloczewski et al., Paper I, 2008AcA....58...23Z 2008AcA....58...23Z, Cat. J/AcA/58/23
(End) Patricia Vannier [CDS] 12-Jul-2010