CCD UBV photometry and kinematics of the open cluster NGC 225

Selcuk Bilir, Z. F. Bostanci, T. Yontan, T. Güver, Volkan Bakis, Ernst Paunzen

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

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 ± 5.0 km s-1 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 ± 0.047 mag and [Fe /H ] = - 0.11 ± 0.01 dex, 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 μV = 9.3 ± 0.07 mag, d = 585 ± 20 pc and t = 900 ± 100 Myr, 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 ± 5 Myr.
OriginalspracheEnglisch
Seiten (von - bis)1900 - 1914
Seitenumfang15
FachzeitschriftAdvances in Space Research
Jahrgang58
Ausgabenummer9
DOIs
PublikationsstatusVeröffentlicht - 1 Nov. 2016

ÖFOS 2012

  • 103003 Astronomie
  • 103004 Astrophysik

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