J/A+A/459/489 Blue straggler stars in open clusters (De Marchi+, 2006)
Search and analysis of blue straggler stars in open clusters.
De Marchi F., De Angeli F., Piotto G., Carraro G., Davies M.B.
<Astron. Astrophys. 459, 489 (2006)>
=2006A&A...459..489D 2006A&A...459..489D
ADC_Keywords: Clusters, open; Stars, blue ; Stars, peculiar
Keywords: catalogs - stars: blue stragglers -
Galaxy: globular clusters: general -
Galaxy: open clusters and associations: general -
stars: Hertzsprung-Russell (HR) and C-M diagrams
Abstract:
This paper presents a new homogeneous catalogue of blue straggler
stars (BSS) in Galactic open clusters. Photometric data for 216
clusters were collected from the literature and 2782 BSS candidates
were extracted from 76 of them. We found that the anticorrelation of
BSS frequency vs. total magnitude identified in similar studies
conducted on Galactic globular clusters extends to the open cluster
regime: clusters with smaller total magnitude tend to have higher BSS
frequencies. Moreover, a clear correlation between the BSS frequency
(obtained normalising the total number of BSS either to the total
cluster mass or, for the older clusters, to the total number of clump
stars) and the age of the clusters was found. A simple model is
developed here to try to explain this last and new result. The model
allows us to ascertain the important effect played by mass loss in the
evolution of open clusters.
Description:
Photometric catalogue of 2782 candidate blue straggler stars in 76
open clusters, candidates were selected from their position in colour
magnitude diagram in 216 open clusters. We give for each cluster and
for each candidate blue straggler the basic data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 109 216 Open cluster parameters
table3.dat 47 2782 Candidate blue stragglers in open clusters
notes.dat 88 15 Individual notes
refs.dat 104 220 References
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See also:
J/A+AS/109/375 : Blue stragglers in open clusters (Ahumada+, 1995)
J/A+A/324/915 : Blue stragglers in M3 (Ferraro+ 1997)
J/AJ/106/604 : Study of globular cluster NGC 6366 (Harris 1993)
J/AJ/108/1786 : Blue stragglers + variable stars in M3 (Guhathakurta+, 1994)
J/AJ/128/3019 : Pal 13 blue stragglers & main-sequence binaries (Clark+, 2004)
J/ApJ/336/780 : gr photometry of NGC 5053 blue stragglers (Nemec+ 1989)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Cluster designation
16- 17 I2 h RAh Right ascension (J2000.0)
19- 20 I2 min RAm Right ascension (J2000.0)
22- 23 I2 s RAs Right ascension (J2000.0)
25 A1 --- DE- Declination sign (J2000.0)
26- 27 I2 deg DEd Declination (J2000.0)
29- 30 I2 arcmin DEm Declination (J2000.0)
32- 33 I2 arcsec DEs Declination (J2000.0)
35- 38 F4.2 mag E(B-V) Reddening
40- 44 F5.2 mag (m-M) Distance modulus
46- 50 F5.3 [yr] log(Age) Decimal logarithm of the age in years
52- 57 F6.2 arcmin Radius ?=- Apparent cluster radius
59- 61 I3 --- NBSS1 Number of blue stragglers candidates
within the apparent radius of the cluster
63- 65 I3 --- NBSS2 Number of blue stragglers candidates
(without limitation on radius)
67- 68 I2 --- Ncl Number of clump stars (without limitation
on radius)
70- 73 A4 --- --- [CCD:]
74- 96 A23 --- Ref(1) References of the CCD photometries examined
(see file refs.dat) (1)
97-101 A5 --- --- [pepg: ]
103-109 A7 --- Ref(2) References for photoelectric (pe) and
photographic (pg) photometries examined
(see file refs.dat) (1)
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Note (1): For each cluster with candidates BSS, the data utilized for the
analysis are taken from the first reference.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Cluster designation
15 A1 --- n_Name [*] indicates a note in file notes.dat
17- 21 I5 --- ID Identification number (1)
23- 29 F7.4 arcmin r Radial distance from the center
31- 36 F6.3 mag Vmag The V magnitude
38- 43 F6.3 mag col The (B-V) (or (V-I), or (b-y)) color index
45- 47 A3 --- Band Band of the color index (2)
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Note (1): Numbering system adopted from the authors of the photometries
Note (2): (V-I) colors for the clusters: Berkeley 66, King 7 Melotte 66,
NGC 2627, NGC 7044, Saurer 1, Saurer 2, Saurer 3, Tombaugh 1.
(b-y) colors for the cluster: NGC 752
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Cluster designation
16- 88 A73 --- Note Text of the note
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference number
5- 23 A19 --- BibCode BibCode
25- 48 A24 --- Aut Author's name
50-104 A55 --- Com Comments
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Acknowledgements: F. De Marchi, fda(at)ast.cam.ac.uk
(End) Patricia Vannier [CDS] 28-Aug-2006