J/other/ASpR/58.1900 NGC 225 CCD UBV photometry (Bilir+, 2016)
CCD UBV photometry and kinematics of the open cluster NGC 225.
Bilir S., Bostanci Z.F., Yontan T., Guver T., Bakis V., Ak T., Ak S.,
Paunzen E., Eker Z.
<Advances Space Res. 58, 1900-1914 (2016)>
=2016AdSpR..58.1900B 2016AdSpR..58.1900B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI ;
Proper motions
Keywords: Hertzsprung-Russell and colour-magnitude diagrams -
open clusters and associations: individual: NGC 225
Abstract:
We present the results of CCD UBV photometric and spectroscopic
observations of the open cluster NGC 225. In order to determine the
structural parameters of NGC 225, we calculated the stellar density
profile in the cluster's field. We estimated the probabilities of the
stars being physical members of the cluster using the existing
astrometric data. The most likely members of the cluster were used in
the determination of the astrophysical parameters of the cluster. We
calculated the mean radial velocity of the cluster as
Vr=-8.3±5.0km/s from the optical spectra of eight stars in the
cluster's field. Using the U-B vs B-V two-colour diagram and UV
excesses of the F-G type main-sequence stars, the reddening and
metallicity of NGC 225 were inferred as E(B-V)=0.151±0.047mag and
[Fe/H]=-0.11±0.01dex, respectively. We fitted the colour-magnitude
diagrams of NGC 225 with the PARSEC isochrones and derived the
distance modulus, distance and age of the cluster as
MuV=9.3±0.07mag, d=585±20pc and t=900±100Myr, respectively. We
also estimated the galactic orbital parameters and space velocity
components of the cluster and found that the cluster has a slightly
eccentric orbit of e=0.07±0.01 and an orbital period of
Porb=255±5Myr.
Description:
CCD UBVRI images of the open cluster NGC 225 and standard stars
selected from Landolt (2009, Cat. J/AJ/137/4186) were acquired on 2012
July 18 using a 1-m Ritchey-Chretien telescope (T100) located at the
TUBITAK National Observatory (TUG) in Bakirlitepe, Antalya/Turkey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 93 1019 Photometric and astrometric catalogue NGC 225
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See also:
J/MNRAS/453/1095 : NGC 6866 UBVRI photometry (Bostanci+, 2015)
J/other/ApSS/355.267 : NGC 6811 CCD UBVRI photometry (Yontan+, 2015)
J/other/ApSS/361.126 : NGC 6819 CCD UBV photometry (Ak+, 2016)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Sequential number
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 29 F5.2 arcsec DEs Declination (J2000)
31- 36 F6.3 mag Vmag Johnson V magnitude
38- 42 F5.3 mag e_Vmag ? rms uncertainty on Vmag
44- 49 F6.3 mag U-B ? Johnson U-B colour index
51- 55 F5.3 mag e_U-B ? rms uncertainty on U-B
57- 61 F5.3 mag B-V ? Johnson B-V colour index
63- 67 F5.3 mag e_B-V ? rms uncertainty on B-V
69- 73 F5.1 mas/yr pmRA ? Proper motion component (pmRA*cosDE)
75- 78 F4.1 mas/yr e_pmRA ? rms uncertainty on pmRA
80- 84 F5.1 mas/yr pmDE ? Proper motion component
86- 89 F4.1 mas/yr e_pmDE ? rms uncertainty on pmDE
91- 93 I3 % Pmemb ? Membership probability
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Acknowledgements:
Selcuk Bilir, sbilir(at)istanbul.edu.tr
(End) Patricia Vannier [CDS] 24-Nov-2016