J/A+A/668/A13 Open clusters housing classical Cepheids (Hao+, 2022)
Open clusters housing classical Cepheids in Gaia DR3.
Hao C.J., Xu Y., Wu Z.Y., Lin Z.H., Bian S.B., Li Y.J., Liu D.J.
<Astron. Astrophys. 668, A13 (2022)>
=2022A&A...668A..13H 2022A&A...668A..13H (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Stars, variable ; Optical ;
Parallaxes, trigonometric ; Proper motions ; Radial velocities
Keywords: Galaxy: stellar content - open clusters and associations: general -
stars: variables: Cepheids - methods: data analysis
Abstract:
The latest Gaia Data Release 3 provides an opportunity to expand the
census of Galactic open clusters harboring classical Cepheid
variables, thereby providing a means to bolster the cosmic distance
scale. A comprehensive analysis yielded a total of 50 classical
Cepheids associated with 45 open clusters, of which 39 open cluster
and classical Cepheid pairs are considered believable, and the
remaining 11 pairs should be improbable but worth following up.
Indeed, two clusters identified previously by Hao et al.
(2022A&A...660A...4H 2022A&A...660A...4H, Cat. J/A+A/660/A4) possibly host classical
Cepheids (OC-0125/V1788 Cyg and OC-0675/OGLE-BLG-CEP-114). In
addition, 38 new open cluster candidates were also identified within
the Galactic disc.
Description:
Combining the high-precision data provided by Gaia DR3 and known
classical Cepheids with our previously practiced clustering search
method, we conducted a search for OCs containing classical Cepheids.
We identified 50 classical Cepheids associated with 45 OCs in 5D
astrometric space. After investigating the ages of the OCs and the
periods of the Cepheids, we found 39 OC-Cepheid pairs to be
probable, and a remaining 11 Cepheids to be improbable and possibly
unrelated to OCs but worthy of follow-up investigation. For all of
these OCz-Cepheid pairs, we provide their astrometric and
astrophysical parameters. In addition to re-detecting 635 known OCs in
the literature, we also propose 38 newly found OC candidates within
the Galactic disk based on a detailed inspection of the
multidimensional distributions of their member stars. For each of
these new OC candidates, we present its mean astrometric values and
radial velocity when available, together with estimations of age,
line-of-sight extinction, and distance modulus. The new OCs are
generally located at greater distances from the Sun, which can help to
improve the completeness of the Galactic OC census.
Table 1 contains parameters of the OC-Cepheid pairs identified in this
work.
Table 2 contains parameters of the proposed newly found OCs.
Table 3 contains the member stars of open clusters housing classical
Cepheids.
Table 4 contains the member stars found for the new open clusters
reported in the work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 190 50 Parameters for open clusters and Cepheid pairs
table2.dat 143 38 Mean parameters for the new open clusters
table3.dat 174 7449 Members for open clusters housing Cepheids
table4.dat 167 1883 Members for the new open clusters
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/660/A4 : Gaia EDR3 new Galactic open clusters (Hao+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Cepheid name
25- 30 F6.2 deg RAdeg Cepheid Right Ascension (ICRS) at Ep=2016.0
32- 35 F4.2 deg e_RAdeg Cepheid Right Ascension error
37- 42 F6.2 deg DEdeg Cepheid Declination (ICRS) at Ep=2016.0
44- 47 F4.2 deg e_DEdeg Cepheid Declination error
49- 52 F4.2 [d] logPer Logarithm of the Cepheid pulsation period
54- 66 A13 --- Cluster Cluster name
68- 73 F6.2 deg RAodeg Cluster Right Ascension (ICRS) at Ep=2016.0
75- 78 F4.2 deg s_RAodeg Cluster Right Ascension standard deviation
80- 85 F6.2 deg DEodeg Cluster Declination mean (ICRS) at Ep=2016.0
87- 90 F4.2 deg s_DEodeg Cluster Declination standard deviation
92- 95 F4.1 arcmin sdeg Angular distance between Cluster and Cepheid
97-100 F4.1 deg adeg Cluster apparent angular size
102-106 F5.2 mas/yr pmRA Cepheid Proper motion in right ascension,
pmRA*cosDE
108-111 F4.2 mas/yr e_pmRA Cepheid pmRA error
113-117 F5.2 mas/yr pmDE Cepheid Proper motion in declination
119-122 F4.2 mas/yr e_pmDE Cepheid pmDE error
124-128 F5.2 mas/yr pmRAoc Cluster Proper motion in right ascension mean,
pmRA*cosDE
130-133 F4.2 mas/yr s_pmRAoc Cluster Proper motion in right ascension
standard deviation
135-139 F5.2 mas/yr pmDEoc Cluster Proper motion in declination mean
141-144 F4.2 mas/yr s_pmDEoc Cluster Proper motion in declination
standard deviation
146-149 F4.2 mas plx Cepheid Parallax
151-154 F4.2 mas e_plx Cepheid parallax error
156-159 F4.2 mas plxoc Cluster Parallax mean
161-164 F4.2 mas s_plxoc Cluster Parallax standard deviation
166-169 F4.2 [yr] logAge Logarithm of the Cepheid age
171-174 A4 [yr] e_logAge ?=- Error of the Cepheid age
176-179 F4.2 [yr] logAgeoc Logarithm of the cluster age
181-184 F4.2 [yr] e_logAgeoc Error of the cluster age
186-188 I3 --- Nmemb Number of cluster members
190 A1 --- Class [ABC] Class of OC-Cepheid pairs
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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- 17 A17 --- Cluster Cluster name (OC-NNNN)
19- 24 F6.2 deg RAdeg Right Ascension (ICRS) at Ep=2016.0
26- 29 F4.2 deg s_RAdeg Right Ascension standard deviation
31- 36 F6.2 deg DEdeg Declination mean (ICRS) at Ep=2016.0
38- 41 F4.2 deg s_DEdeg Declination standard deviation
43- 48 F6.2 deg GLON Galactic longitude mean
50- 53 F4.2 deg s_GLON Galactic longitude standard deviation
55- 59 F5.2 deg GLAT Galactic latitude mean
61- 64 F4.2 deg s_GLAT Galactic latitude standard deviation
66- 69 F4.2 deg adeg Apparent angular size
71- 74 F4.2 mas plx Parallax mean
76- 79 F4.2 mas s_plx Parallax standard deviation
81- 85 F5.2 mas/yr pmRA Proper motion in right ascension mean,
pmRA*cosDE
87- 90 F4.2 mas/yr s_pmRA Proper motion in right ascension standard
deviation
92- 96 F5.2 mas/yr pmDE Proper motion in declination mean
98-101 F4.2 mas/yr s_pmDE Proper motion in declination standard
deviation
103-106 F4.2 [yr] logAge Logarithm of the cluster age
108-111 F4.2 [yr] e_logAge Error of the cluster age
113-116 F4.2 mag AG Line-of-sight extinction
118-122 F5.2 mag DMNN Distance modulus of the cluster
124-129 A6 km/s RV ?=- Radial velocity mean
131-136 A6 km/s s_RV ?=- Radial velocity weighted standard
deviation
138-140 I3 --- Nmemb Number of cluster members
142-143 I2 --- NmembRV Number of cluster members with Gaia
radial velocity measurements
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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- 19 I19 --- GaiaDR3 Gaia DR3 source_id
21- 30 F10.6 deg RAdeg Right Ascension (ICRS) at Ep=2016.0
32- 41 F10.6 deg DEdeg Declination (ICRS) at Ep=2016.0
43- 52 F10.6 deg GLON Galactic longitude
54- 62 F9.6 deg GLAT Galactic latitude
64- 71 F8.6 mas plx Parallax
73- 80 F8.6 mas e_plx Parallax error
82- 90 F9.6 mas/yr pmRA Proper motion in right ascension, pmRA*cosDE
92- 99 F8.6 mas/yr e_pmRA pmRA error
101-109 F9.6 mas/yr pmDE Proper motion in declination
111-118 F8.6 mas/yr e_pmDE pmDE error
120-130 F11.6 km/s RV ? Radial velocity
132-140 F9.6 km/s e_RV ? Radial velocity error
142-150 F9.6 mag Gmag Gaia G magnitude
152-160 F9.6 mag BP-RP ? Gaia BP-RP colour
162-174 A13 --- Cluster Cluster name
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR3 Gaia DR3 source_id
21- 30 F10.6 deg RAdeg Right Ascension (ICRS) at Ep=2016.0
32- 41 F10.6 deg DEdeg Declination (ICRS) at Ep=2016.0
43- 52 F10.6 deg GLON Galactic longitude
54- 62 F9.6 deg GLAT Galactic latitude
64- 71 F8.6 mas plx Parallax
73- 80 F8.6 mas e_plx Parallax error
82- 90 F9.6 mas/yr pmRA Proper motion in right ascension, pmRA*cosDE
92- 99 F8.6 mas/yr e_pmRA pmRA error
101-109 F9.6 mas/yr pmDE Proper motion in declination
111-118 F8.6 mas/yr e_pmDE pmDE error
120-130 F11.6 km/s RV ? Radial velocity
132-140 F9.6 km/s e_RV ? Radial velocity error
142-150 F9.6 mag Gmag Gaia G magnitude
152-159 F8.6 mag BP-RP ? Gaia BP-RP colour
161-167 A7 --- Cluster Cluster name (OC-NNNN)
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Acknowledgements:
Ye Xu, xuye(at)pmo.ac.cn
Choajie Hao, cjhao(at)pmo.ac.cn
(End) Patricia Vannier [CDS] 26-Sep-2022