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V/28 Proper Motions, UBV Photometry, Four Open Clusters (Frolov 1980)
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Proper Motions and UBV Photometry of Stars in the Region of Open Clusters NGC
7788, NGC 7790, Berkeley 58 and Anonymous
Frolov V.N.
<Pulkovo Obs., unpublished (1980)>
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ADC_Keywords: Clusters, open; Proper motions; Photometry, UBV; Regional
catalog
Abstract:
Proper motions were determined for 2169 stars with limiting
magnitude B = 16.5 mag and located within a 60 x 60 area centered at
RA = 23 h 54.2 min, Dec = 60 deg 57 arcmin (1950.0). Three plate pairs
with a mean epoch difference of 49 years were used. The first epoch
plates were taken with the Tashkent normal astrograph during 1923-1925
and the second epoch plates with the Pulkovo normal astrograph.
The proper motions have a mean error +/-0.0030 arcsec (B < 14.5 mag)
and +/-0.0036 arcsec (B > 14.5 mag) and were measured relative to
reference stars with 13.5 mag <= B <= 14.5 mag.
Photographic UBV magnitudes were measured using Sandages photoelectric
standards. The U, B and V magnitudes were determined for 1930, 2165 and
1734 stars respectively, with the corresponding mean errors +/-0.03 mag,
+/-0.06 mag and +/-0.05 mag.
In the measured area there are three known open clusters (NGC 7788,
NGC 7790 and Berkeley 58) and a previously unknown open cluster,
discovered by the author, centered at RA =23 h 54.9 min, Dec = 61 deg
21 arcmin (1950.0). The cluster members were selected on the basis of the
proper motion (vector diagram) and photometric (V ~ B-V and U-B ~ B-V)
criteria. Stars within areas with 4 arcmin radii centered on NGC 7788 and
NGC 7790 and 6 arcmin radii centered on Berkeley 58 and the anonymous
cluster were investigated for cluster membership.
The method of reduction of the observational data and the results obtained
have been published in Izv. Pulkovo 195, 80, 1977 and 196, 69, 1979.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
adjarea.dat 58 2160 Photometry and Proper Motions Data
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Byte-by-byte Description of file: adjarea.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Star Number
6- 11 F6.2 mm X X-Coordinate
13- 18 F6.2 mm Y Y-Coordinate
20- 24 F5.2 mag V *? V Magnitude
26- 29 F4.2 mag B-V ? B-V color index
31- 35 F5.2 mag U-B ? U-B color index
37- 40 I4 10-4arcmin/a pmX X-annual proper motion
42- 46 I5 10-4arcmin/a pmY Y-annual proper motion
55- 58 I4 --- Cl_mem *Cluster Membership
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Note on V:
The following stars are known variables
327 - Cepheid CG Cas
693 - Algol Type Variable
893 - Double Cepheid CE Cas
903 - Cepheid CF Cas
Note on Cl_mem:
Cluster Membership Designation
7788 = member of NGC 7788
7790 = member of NGC 7790
58 = member of Berkeley 58
1 = member of anonymous cluster
0 = no designation
References:
Frolov V.N. (1977) Izv. Pulkovo 195, 80. =1977IzPul.195...80F
? (1979) Izv. Pulkovo 196, 69.
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(End) Julie Anne Watko [SSDOO/ADC] 30-MAY-1996