J/PASP/119/7 HST WFPC2 star clusters in M31 (Krienke+, 2007)
A Hubble space telescope survey of the disk cluster population of M31.
I. WFPC2 pointings.
Krienke O.K., Hodge P.W.
<Publ. Astron. Soc. Pac., 119, 7-18 (2007)>
=2007PASP..119....7K 2007PASP..119....7K
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry
Abstract:
As a followup to the automated cluster search carried out by Williams
& Hodge (2001ApJ...548..190W 2001ApJ...548..190W), we have examined 39 Hubble Space
Telescope Wide Field Planetary Camera 2 (WFPC2) pointings to locate
and study a comprehensive collection of disk clusters. The Williams
technique was effective in finding young clusters, but not
intermediate-age or old clusters. Our searches have shown that M31 has
large numbers of these intermediate and older open clusters, most of
them undetected by both the Williams survey and other ground-based
searches. We present a catalog of 343 clusters detected on the WFPC2
images. Extrapolation from our data indicates that the entire disk of
M31 contains approximately 80000 star clusters. We have carried out
integrated multicolor photometry of these clusters to ascertain their
properties and to compare their properties with cluster systems of
other galaxies. We show the cluster luminosity function, the
color-magnitude diagram, the formation function, and the size
distribution. Cluster densities and colors show trends with disk
position. An age distribution is derived and, although the ages are
very uncertain for the fainter clusters, there is evidence for cluster
dynamical destruction at about the same rate as in our Galaxy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 69 343 Star clusters detected in M31 WFPC2 HST pointings
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See also:
J/AcA/48/455 : Globular Clusters in M31 and M33 (Mochejska+, 1998)
J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000)
J/AJ/123/2490 : RV and [Fe/H] of M31 globular cluster system (Perrett+, 2002)
J/AJ/122/2458 : M31 globular clusters from HST (Barmby+, 2001)
J/ApJ/559/851 : Young star cluster candidates in M31 (Williams+, 2001)
J/A+A/449/143 : Photometry of M31 globular cluster candidates (Ma+, 2006)
J/A+A/456/985 : Radial velocities of 76 M31 candidate clusters (Galleti+, 2006)
J/PASP/120/1 : HST WFPC2 star clusters in M31. II. (Krienke, 2008)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 A1 --- n_Name [AB] previously (A) or this study (B)
identified cluster
3- 11 A9 --- Name Cluster name (1)
13 I1 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 34 F4.1 arcsec DEs [0/60] Declination (J2000)
36- 41 F6.3 mag Vmag ? V magnitude (2)
43- 47 F5.3 mag e_Vmag ? rms uncertainty on Vmag (2)
49- 53 F5.2 mag B-V ? B-V colour index (2)
55- 59 F5.3 mag e_B-V ? rms uncertainty on B-V (2)
61- 64 F4.2 mag V-I ? V-I colour index (2)
66- 69 F4.2 mag e_V-I ? rms uncertainty on V-I (2)
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Note (1): Nomenclature notes:
BH = for the objects coincident with Barmby & Huchra
(2001, Cat. J/AJ/122/2458) open clusters
GNNN = Sargent et al. (1977AJ.....82..947S 1977AJ.....82..947S), SKHB NNN in Simbad
KNNN = Sargent et al. (1977AJ.....82..947S 1977AJ.....82..947S), SKHB NNN in Simbad
NBC = For the objects present in (Galleti et al., 2004, Cat.
J/A+A/416/917), excluding those in Sargent et al.
(1977AJ.....82..947S 1977AJ.....82..947S) and Barmby & Huchra (2001,
Cat. J/AJ/122/2458).
WH = For the objects in Williams & Hodge (2001, Cat. J/ApJ/559/851)
KHM31-NNN = New clusters (KHM31 NNN in Simbad)
Note (2): When a cluster was identified but the image was defective because
of bad pixels, column defects, or cosmic rays in single exposures, we
list the position only.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Feb-2008