J/PAZh/36/354 NGC 6866 proper motions and CCD photometry (Frolov+, 2010)
Proper motions and CCD photometry of stars in the region of the open cluster
NGC 6866.
Frolov V.N., Ananjevskaja Yu.K., Gorshanov D.L., Polyakov E.V.
<Pis'ma Astron. Zh. 36, 354 (2010)>
=2010PAZh...36..354F 2010PAZh...36..354F
=2010AstL...36..338F 2010AstL...36..338F
ADC_Keywords: Clusters, open ; Proper motions ; Photometry, CCD
Keywords: open star clusters: NGC 6866 - photometry - proper motions
Abstract:
We present the results of our comprehensive study of the Galactic open
star cluster NGC 6866. The positions of stars in the investigated
region have been obtained with the "Fantasy "automatic measuring
machine from 10 plates of the normal astrograph at the Pulkovo
Astronomical Observatory. The size of the investigated field is
40x40arcmin2, the limiting magnitude is B≤16.6mag, and the maximum
epoch difference is 79yr. For 1202 field stars we have determined the
relative proper motions with a rms error of 0.5mas/yr. Out of them 413
stars may be considered cluster members with a probability P>70%
according to the astrometric criterion. Photometric diagrams have been
used as an additional criterion. We have performed two-color BV CCD
photometry of stars with the Pulkovo ZA-320M mirror astrograph. The U
magnitudes from the literature have also been used to construct the
two-color diagrams. A total of 267 stars have turned out to be members
of NGC 6866 according to the two criteria. We present refined physical
parameters of the cluster and its age estimate (5.6x108yr). The
cluster membership of red and blue giants, variable, double, and
multiple stars is considered. We have found an almost complete
coincidence of the positions of one of the stars in the region (a
cluster nonmember) and a soft X-ray source in the ROSAT catalog. The
"Fantasy " automatic measuring machine is described in the Appendix.
DOI:10.1134/S106377371005004X
Description:
Table 2 (The astrometrical results) and Table 3 (Photometric data)
from the paper.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
20 03 55 +44 09 30 NGC 6866 = Cl Melotte 229
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 83 1202 Stars proper motions and estimations of their
cluster membership
table3.dat 98 1202 Photometric data of stars in the NGC 6866 area
--------------------------------------------------------------------------------
See also:
I/295 : Absolute Proper motions of 59766 stars (Bobylev+, 2004)
I/252 : The USNO-A2.0 Catalogue (Monet+ 1998)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq Sequential number
6- 18 A13 --- USNO-A2.0 Star number in USNO-A 2.0, Cat. I/252
20- 25 F6.2 arcmin Xpos Rectangular coordinate X of star (G1)
27- 32 F6.2 arcmin Ypos Rectangular coordinate Y of star (G1)
33- 38 F6.1 mas/yr pmX Relative proper motion along X (RA)
39- 42 F4.1 mas/yr e_pmX pmX standard error
43- 48 F6.1 mas/yr pmY Relative proper motion along Y (DE)
49- 52 F4.1 mas/yr e_pmY pmY standard error
53- 55 I3 --- Pl Number of plates
56- 58 I3 % Mm Membership probability
60- 61 A2 --- bl "bl" marks blends
63- 83 A21 --- ONames Names in BD, HD, IRAS, Tycho or ROSAT catalogs
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq Sequential number
6- 11 F6.2 arcmin Xpos Rectangular coordinate X of a star
relative to the star N 649 (G1)
13- 18 F6.2 arcmin Ypos Rectangular coordinate Y of a star
relative to the star N 649 (G1)
20- 24 F5.2 mag Bmag ? CCD photometry in the B band
26- 30 F5.2 mag Vmag ? CCD photometry in the V band
32- 36 A5 --- BZ ? Star number according to (BZ) (1)
38- 42 F5.2 mag Bmag1 ? Photographic (BZ) B magnitude (1)
43 A1 --- n_Bmag1 [:] marks blends
45- 49 F5.2 mag Vmag1 ? Photoelectric (BZ) V magnitude (1)
50 A1 --- n_Vmag1 [:] marks blends
52- 56 F5.2 mag Bmag2 ? Photographic (SH) B magnitude (1)
58- 62 F5.2 mag Vmag2 ? Photographic (SH) V magnitude (1)
64- 68 F5.2 mag Umag2 ? Photographic (SH) U magnitude (1)
70- 74 F5.2 mag Bmag3 ? Photoelectric or photographic (WC)
B magnitude (1)
75 A1 --- n_Bmag3 [:] marks blends
77- 81 F5.2 mag Vmag3 ? Photoelectric or photographic (WC)
V magnitude (1)
82 A1 --- n_Vmag3 [:] marks blends
83- 87 F5.2 mag Umag3 ? Photoelectric or photographic (WC)
U magnitude (1)
88 A1 --- n_Umag3 [:] marks blends
93- 98 A6 --- Notes Notes (bl marks blends)
--------------------------------------------------------------------------------
Note (1): References:
BZ = Barkhatova, K.A., and Zakharova, P.E., 1970, Ural. Sb. 93,
vipusk 6, 3, In Russian
SH = Sutantio, W. and Hidajat, B.: 1972, IBSH, 19, 31S
WC = Hoag, A.A., Johnson, H.L., Iriarte, B., et al.:
1961PUSNO..17..343H 1961PUSNO..17..343H (NGC 6866 NN)
--------------------------------------------------------------------------------
Global notes:
Note (G1): Position relative to the star (X along RA, Y along DE)
N 649 = USNO-A2.0 1275-13248250 (20:03:57.366+44:09:33.89) (J2000)
--------------------------------------------------------------------------------
Acknowledgements:
V.N. Frolov,
History:
* 20-May-2010 : Original tables
* 26-Apr-2011 : In table2, for No 748, cross-identification to HD 190465
suppressed.
(End) Patricia Vannier [CDS] 20-May-2010