J/A+AS/114/281 NGC 7762: a moderate age open cluster (Patat+, 1995)
NGC 7762: a forgotten moderate age open cluster
Patat F., Carraro G.
<Astron. Astrophys. Suppl. Ser. 114, 281 (1995)>
=1995A&AS..114..281P 1995A&AS..114..281P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open; Photometry, CCD
Keywords: open clusters: NGC 7762 - HR diagram
Description:
We report CCD B and V photometry for the central region of the old
open cluster NGC 7762. The cluster appears very loose and occupies a
large sky area. The Colour Magnitude Diagram (CMD) shows a distinct
Main Sequence (MS) down to V≃16.5, and a couple of evolved stars. The
bottom of the sequence is characterized by a large spread, much
greater than the expected broadness due to photometric errors, and
probably related to low mass stars evaporation. The analysis here
carried out allows us to conclude that NGC 7762 in an intermediate age
cluster about 1.8Gyr old. The comparison with theoretical isochrones
from the Padova group constrains colour excess and apparent distance
modulus in the range 0.85-0.90 and 12.00-12.20, respectively. The
distance to the Sun comes out to be 800 pc, somewhat lower than
Chincarini's (1966MmSAI..37..423C 1966MmSAI..37..423C) estimate.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 44 142 Photometry
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Star identification number
6- 7 I2 --- C66 []? Chincarini numbering for common stars
10- 15 F6.2 pix Xpos X coordinate
18- 23 F6.2 pix Ypos Y coordinate
26- 30 F5.2 mag Vmag V magnitude
33- 37 F5.2 mag B-V B-V colour index
40- 44 F5.3 mag e_Vmag Error on V magnitude
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(End) Simona Mei [CDS] 05-Jul-1995