J/MNRAS/461/2519 NGC2548 clumpy spatial and kinematic structure (Vicente+, 2016)
NGC 2548: clumpy spatial and kinematic structure in an intermediate-age
Galactic cluster.
Vicente B., Sanchez N., Alfaro E.
<Mon. Not. R. Astron. Soc. 461, 2519 (2016)>
=2016MNRAS.461.2519V 2016MNRAS.461.2519V (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Proper motions ; Positional data
Keywords: stars: kinematics and dynamics -
open clusters and associations: general -
open clusters and associations: individual: NGC 2548
Abstract:
NGC 2548 is a ∼400-500Myr old open cluster with evidence of
spatial substructures likely caused by its interaction with the
Galactic disc. In this work we use precise astrometric data from the
Carte du Ciel - San Fernando (CdC-SF) catalogue to study the clumpy
structure in this cluster. We confirm the fragmented structure of NGC
2548 but, additionally, the relatively high precision of our kinematic
data lead us to the first detection of substructures in the proper
motion space of a stellar cluster. There are three spatially separated
cores each of which has its own counterpart in the proper motion
distribution. The two main cores lie nearly parallel to the Galactic
plane whereas the third one is significantly fainter than the others
and it moves towards the Galactic plane separating from the rest of
the cluster. We derive core positions and proper motions, as well as
the stars belonging to each core.
Description:
We used precise astrometric data from the Carte du Ciel - San Fernando
catalogue to study the clumpy structure in NGC 2548. We have completed
our spatial and kinematic information with photometric data from the
UCAC4 catalogue. With this, we derived positions and proper motions
for each of the detected cores in this cluster. This table contains
all the astrometric and photometric data for the 1655 stars toward
NGC 2548.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 191 1655 Astrometric and photometric data for NGC 2548
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See also:
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- UCAC4 Source ID from UCAC4 (ZZZ-NNNNNN)
13- 23 F11.7 deg RAdeg Right ascension (J2000)
26- 35 F10.7 deg DEdeg Declination (J2000)
38- 43 F6.2 mas/yr pmRA Proper motion in right ascension, pmRA*cosDE
46- 50 F5.2 mas/yr e_pmRA Error of pmRA
53- 59 F7.2 mas/yr pmDE Proper motion in declination
62- 66 F5.2 mas/yr e_pmDE Error of pmDE
69- 74 F6.4 --- Prob Membership probability
77- 82 F6.3 mag Bmag ? B magnitude from UCAC4
85- 88 F4.2 mag e_Bmag ? Error in Bmag
91- 96 F6.3 mag Vmag ? V magnitude from UCAC4
99-102 F4.2 mag e_Vmag ? Error in Vmag
105-110 F6.3 mag gmag ? g magnitude from UCAC4
113-116 F4.2 mag e_gmag ? Error in gmag
119-124 F6.3 mag rmag ? r magnitude from UCAC4
127-130 F4.2 mag e_rmag ? Error in rmag
133-138 F6.3 mag imag ? i magnitude from UCAC4
141-144 F4.2 mag e_imag ? Error in imag
147-152 F6.3 mag Jmag J magnitude from UCAC4
155-158 F4.2 mag e_Jmag Error in Jmag
161-166 F6.3 mag Hmag H magnitude from UCAC4
169-172 F4.2 mag e_Hmag Error in Hmag
175-180 F6.3 mag Kmag K magnitude from UCAC4
183-186 F4.2 mag e_Kmag Error in Kmag
189-191 A3 --- Otype Object type code (1)
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Note (1): Object type codes as follows:
M = cluster member
MC1 = member belonging to core C1
MC2 = member belonging to core C2
MA = member belonging to core A
F = field star
FO = outlier (assumed as field star)
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Acknowledgements:
Nestor Sanchez, nestor(at)um.es
(End) Nestor Sanchez [Univ. Murcia, Spain], Patricia Vannier [CDS] 14-Oct-2016