UBV(RI)_KC Photometry of NGC 2323 and NGC 2539 Open Clusters


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Akkaya Oralhan I. , Michel R., Schuster W. J. , Karataş Y., Karslı Y., Chavarria C.

Journal Of Astrophysics And Astronomy, cilt.40, no.33, ss.1-18, 2019 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 40 Konu: 4
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1007/s12036-019-9600-7
  • Dergi Adı: Journal Of Astrophysics And Astronomy
  • Sayfa Sayıları: ss.1-18

Özet

The open clusters NGC 2323 and NGC 2539 have been analysed using CCD UBV(RI)KC photometric data, observed at the San Pedro Martir Observatory. Cluster memberships have been determined with ´ the proper motion and parallax measures from the GaiaDR2 astrometric data release. Photometric metal and heavy element abundances have been obtained as ([M/H], Z) = (−0.10, 0.012) (NGC 2323) and (−0.31, 0.007) (NGC 2539), from the δ(U–B) technique in the two colour diagrams, which are used to select the appropriate PARSEC isochrones. The estimated reddening of NGC 2323 is E(B-V)=0.23±0.04 using 11 early type stars. For NGC 2539, we find E(B-V)= 0.02±0.06. For (B–V) colour, distance moduli and distances for NGC 2323 and NGC 2539 are derived as (V0–MV, d (pc)) = (10.00±0.10, 1000±50) and (V0–MV, d (pc)) = (10.00±0.04, 1000±20), respectively. The median GaiaDR2 distance d=1000±140 pc ($=0.998±0.136 mas) for the likely members of NGC 2323 is in concordance with its four colour photometric distances 910–1000 pc. For NGC 2539, its GaiaDR2 distance d=1330±250 pc ($=0.751±0.139 mas) is close to its four colour photometric distances, 1000 pc. Fitting the PARSEC isochrones to the colour magnitude diagrams (CMDs) gives an old age, 890±110 Myr, for NGC 2539. Whereas NGC 2323 has an intermediate-age, 200±50 Myr. One Red Clump/Red Giant candidate (BD-12 2380) in the CMDs of NGC 2539 has been confirmed as a member in terms of the distances dI =950±50 pc and dV=910±90 pc of V I filters within the uncertainties, as compared to the distance, 1000±20 pc of NGC 2539. This giant’s GaiaDR2 distance (d=1200±70 pc) is not close to these photometric distances.