J/A+A/385/471 UBVI photometry of NGC 7036 and NGC 7772 (Carraro+, 2002)
Photometry of dissolving star cluster candidates.
The cases of NGC 7036 and NGC 7772.
Carraro G.
<Astron. Astrophys. 385, 471 (2002)>
=2002A&A...385..471C 2002A&A...385..471C
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD
Keywords: open clusters and associations: individual: NGC 7036, NGC 7772 -
open clusters and associations: general
Abstract:
We present CCD UBVI observations obtained in the field of the two
previously unstudied dissolving open cluster candidates NGC 7036 and
NGC 7772. Our analysis suggests that both the objects are Open Cluster
Remnants (OCR). NGC 7036 is an open cluster remnant with a core radius
of about 3-4 arcmin. We derive for the first time estimates of its
fundamental parameters. We identify 17 likely members that define a
group of stars at 1kpc from the Sun, with a low reddening E(B-V)∼0.1,
and with an age of about 3-4Gyr. As for NGC 7772, we identify 14
likely members, that define a group of stars with a very low
reddening (E(B-V)∼0.03), are 1.5Gyr old and are located about 1.5kpc
from the Sun.
Objects:
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RA (2000) DE Designation GLON GLAT
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21 10 02.0 +15 31 06 NGC 7036 64.55 -21.44
23 51 46.0 +16 14 48 NGC 7772 102.74 -44.27
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ngc7036.dat 85 331 Photometry of NGC 7036
ngc7772.dat 85 137 Photometry of NGC 7772
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Byte-by-byte Description of file: ngc7036.dat ngc7772.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
5- 12 F8.3 pix Xpos X coordinates (1)
14- 21 F8.3 pix Ypos Y coordinates (1)
23- 29 F7.4 mag Vmag ?=99.9999 V band magnitude
31- 37 F7.4 mag e_Vmag ?=99.9990 error in Vmag
39- 45 F7.4 mag B-V ?=99.9999 (B-V) color index
47- 53 F7.4 mag e_B-V ?=99.9990 error in (B-V)
55- 61 F7.4 mag U-B ?=99.9999 (U-B) color index
63- 69 F7.4 mag e_U-B ?=99.9990 error in (U-B)
71- 77 F7.4 mag V-I ?=99.9999 (V-I) color index
79- 85 F7.4 mag e_V-I ?=99.9990 error in (V-I)
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Note (1): The center is in (500.0,500.0) pixel. The scale is 0.473"/pix.
East is toward positive X, South toward positive Y.
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Acknowledgements: Giovanni Carraro
(End) Patricia Bauer [CDS] 26-Mar-2002