J/A+A/672/A81 New detection of blue straggler stars in open clusters (Li+, 2023)
The new detection of blue straggler stars in 50 open clusters using Gaia DR3.
Li C., Zhong J., Qin S., Chen L.
<Astron. Astrophys. 672, A81 (2023)>
=2023A&A...672A..81L 2023A&A...672A..81L (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, blue ; Stars, peculiar ; Optical
Keywords: catalogs - stars: blue stragglers -
open clusters and associations: general
Abstract:
The particularly abundant presence of blue straggler stars (BSS) in
Galactic open clusters offers favorable conditions for detailed
studies on the statistical properties and the origin of the blue
straggler population. With the help of Gaia DR3, the number of
identified open clusters continuously increases, and the determination
of star cluster members is more reliable.
We performed a more thorough search for BSS in newly found open
clusters based on Gaia data.
We implemented a uniform membership determination for over one
thousand newly identified open clusters with larger sky coverage based
on the astrometric and photometric data from Gaia DR3. The membership
probabilities of stars were assigned by the pyUPMASK algorithm. Then
we estimated the physical parameters of these clusters by isochrone
fitting on their CMDs and picked out BSS in the specific region of
these CMDs.
We identified 138 BSS that had not been reported before in 50 open
clusters.
Compared with recent catalogs that present more than 1500 BSS in 339
open clusters, our new catalog increased the number of BSS in Galactic
open clusters by about 10%, and the number of open clusters with BSS
by nearly 17%. In the future, more accurate abundance measurements are
anticipated to better probe the origin of BSS in open clusters.
Description:
This study aimed to perform a more thorough search for BSS in a larger
sky coverage of newly found open clusters. Based on the astrometric
and photometric data from Gaia DR3, a uniform membership determination
for these newly found open clusters was implemented. An amount of 138
blue straggler candidates were found in 50 open clusters. Mean
parameters for clusters, membership probability and individual data
for cluster members are reported.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 77 50 Parameters of clusters with blue stragglers
table2.dat 128 12499 Parameters of cluster members,
including BS, pBS and YSS
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 deg RAdeg Right ascension (ICRS) at Ep=2016.0
10- 17 F8.4 deg DEdeg Declination (ICRS) at Ep=2016.0
19- 23 F5.2 mas/yr pmRA Proper motion along RA, pmRA*cosDE
25- 30 F6.2 mas/yr pmDE Proper motion along DE
32- 35 F4.2 mas Plx Parallax
37- 39 I3 --- Nmemb Number of member stars
41 I1 --- NBS Number of bonafide blue stragglers
43 I1 --- NpBS Number of probable blue stragglers
45- 49 F5.2 [yr] logt Decimal logarithm of the age
51- 55 F5.2 mag DM Distance module
57- 60 F4.2 mag E(G-RP) Reddening
62- 66 F5.3 --- Z Metallicity
68- 75 A8 --- Cluster Cluster name
77 I1 --- Flag [1/2] Cluster categories (1)
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Note (1): Cluster categories as follows:
1 = Class 1 objects
2 = Class 2 objects
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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- 19 I19 --- GaiaDR3 Unique source designate in Gaia DR3
21- 28 A8 --- Cluster Cluster name
30- 33 F4.2 --- Pmemb Membership probability
35- 37 A3 --- Note Note (1)
39- 46 F8.4 deg RAdeg Gaia DR3 right ascension (ICRS) at Ep=2016.0
48- 55 F8.4 deg DEdeg Gaia DR3 declination (ICRS) at Ep=2016.0
57- 62 F6.3 mas/yr pmRA Gaia DR3 proper motion along RA, pmRA*cosDE
64- 68 F5.3 mas/yr e_pmRA Standard error of pmRA
70- 76 F7.3 mas/yr pmDE Gaia DR3 proper motion along DE
78- 82 F5.3 mas/yr e_pmDE Standard error of pmDE
84- 88 F5.3 mas Plx Gaia DR3 parallax
90- 94 F5.3 mas e_Plx Standard error of Plx
96-101 F6.3 mag Gmag Gaia DR3 mean G magnitude
103-108 F6.3 mag BPmag Gaia DR3 mean BP magnitude
110-115 F6.3 mag RPmag Gaia DR3 mean RP magnitude
117-122 F6.3 mag Gmagcor Gmag after differential reddening correction
124-128 F5.3 mag (G-RP)cor (G-RP) magnitude after differential
reddening correction
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Note (1): Note as follows:
BS = genuine blue stragglers
pBS = probable blue stragglers
YSS = yellow stragglers
N = not a straggler
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Acknowledgements:
Chunyan Li, lichunyan(at)shao.ac.cn
(End) Patricia Vannier [CDS] 08-Mar-2023