J/PAZh/41/367 Relative proper motions in NGC 6800 (Ananjevskaja+, 2015)
Investigation of the Open Star Cluster NGC 6800.
Ananjevskaja Yu.K., Frolov V.N., Polyakov E.V.
<Pis'ma Astron. Zh. 41, 367 (2015)>
=2015PAZh...41..367A 2015PAZh...41..367A (SIMBAD/NED BibCode)
=2015AstL...41..334A 2015AstL...41..334A
ADC_Keywords: Clusters, open; Proper motions
Keywords: open star clusters: NGC 6800, photometry, proper motions
Abstract:
The results of a comprehensive study of the Galactic open cluster
NGC 6800 are presented. The positions of stars to a limiting magnitude
B≤16.5mag in an 80x80 arcmin field centered at the cluster were
measured on eight plates from the Pulkovo normal astrograph with a
maximum epoch difference of 57 years. The measurements were performed
with the Pulkovo "Fantasy" automated measuring system. The
corresponding field from the 2MASS catalogue was used as an additional
plate. As a result, the relative proper motions of stars were obtained
with a root-mean-square error of 3.0 mas/yr. A catalogue of BV and JHK
magnitudes for objects in the investigated region was compiled from
available published resources. The astrometric selection of cluster
members was made by the maximum likelihood method. An individual
cluster membership probability of a star P≥60% served as the first
selection criterion. The position of a star on the photometric
color-magnitude (V-(B-V)), J-(J-Ks)) diagrams was considered as the
second selection criterion. On the basis of these criteria, it was
established that 109 stars are members of NGC 6800. These data were
used to refine the physical parameters of the cluster: the mean
reddening E(B-V)=0.40mag, the true distance modulus (V-Mv)0=10.05mag,
and the cluster age ∼250Myr. The luminosity and mass functions were
constructed. The position of the center of the cluster NGC 6800 was
improved: RA=19:27:11.2 and DE=+25:07:24 (2000).
Description:
Table 2 (The astrometrical results) from the paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 90 6605 Stars proper motions and estimations of their
belonging to the cluster
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See also:
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Number of a star according to our study
6- 18 A13 --- USNO-A2.0 Name of the star in USNO-A 2.0
20- 27 F8.4 arcmin X Rectangular coordinate X (1)
29- 36 F8.4 arcmin Y Rectangular coordinate Y (1)
38- 43 F6.1 mas/yr pmX ? X proper motion of the star
45- 48 F4.1 mas/yr e_pmX ? Standard error on pmX
50- 55 F6.1 mas/yr pmY ? Y proper motion
57- 60 F4.1 mas/yr e_pmY ? Standard error on pmY
62 I1 --- NPlate ? Number of plates used
64- 65 I2 % Pmemb ? Cluster membership probability
67- 70 F4.1 mag Bmag B magnitude
72- 73 A2 --- Notes Notes (2)
75- 90 A16 --- Name Names of the star in the BD, HD, and Tycho
catalogues, if exist
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Note (1): Rectangular coordinates relative to the star 3177 on plate
No. 8553 (1967).
Note (2): Notes as follows:
bl = blends
: = a poor measurement
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Acknowledgements:
Julia Ananjevskaja, anan(at)gao.spb.ru
(End) Yulia Ananjevskaja [GAO, Russia], Patricia Vannier [CDS] 16-Sep-2015