Fundamental and Structural Parameters of the Be97 and Di06 Open Star Clusters

We have selected two poor studied open clusters with the name of Berkeley97 and Dias06 which are located in the first and second Galactic Quadrant and containing F-G spectral type stars. CCD UBV(RI)C photometric observations of the selected clusters are taken from 0.84 m f/13 Ritchey-Chretien telescope in San Pedro Martir (SPM) National Observatory is connected to Universidad Nacional Aut&oacute;noma de Mexico (UNAM). The standard data reduction procedures has been applied to CCD UBV(RI)C observations by using IRAF. We have also used 2MASS JHKS photometry to determine the fundamental and structural parameters such as limit radius [Rlim], reddenings E(B-V), photometric metal and heavy element abundances ([Fe/H], Z), distance modulus (V-Mv)o, distances d(kpc), and ages A(Gyr) of these clusters. We have used PPMXL catalogue to determine the stars as a cluster member from their proper motions.</p

NGC 2323, NGC 2395 ve NGC 2539 Açık Yıldız Kümelerinin Temel ve Yapısal Parametreleri

Bu &ccedil;alışmada NGC 2323, NGC 2395, NGC 2539 a&ccedil;ık yıldız k&uuml;melerinin CCD UBV(RI)c fotometrik verileri ve PPMXL veri kataloğu kullanılarak temel astrofiziksel parametreleri belirlenmiştir. CCD UBV(RI)c fotometrik g&ouml;zlemleri Meksika San Pedro Martir (SPM) Ulusal Astronomi G&ouml;zlemevi&rsquo;nde 0.84 m teleskop ile g&ouml;zlenmiştir. K&uuml;me &uuml;yelikleri ve alan yıldızlarının belirlenmesinde &ouml;z haraket dağılımları kullanılmıştır. Bu &uuml;&ccedil; k&uuml;menin Radyal Yoğunluk Dağı- lımı ve limit yarı&ccedil;apını belirlemek i&ccedil;in 2MASS veri katoloğundaki JHK verileri kullanılmıştır. Bressan ve ark. (2012) ait eşyaş eğrileri kullanılarak k&uuml;melerin beş farklı renk-kadir diyagramı ve renk-renk diyagramıyla &ccedil;akıştırılmasından renk artığı, metal ve ağır element bolluğu, uzaklık, uzaklık mod&uuml;l&uuml; ve yaşları tayin edilmiştir.</p

CCD UBV(RI)(KC) photometry of the open clusters Juchert 9 and Berkeley 97

The CCD UBV(RI)(KC) photometry of the poorly studied open clusters Juchert 9 (Juc 9) and Berkeley 97 (Be 97), which are observed with the 0.84 m telescope at the San Pedro Martir National Observatory, Mexico has been analyzed. For the likely cluster members, we determined the reddenings, E(B-V) = 0.82 +/- 0.04 (Juc 9) and E(B-V) = 0.87 +/- 0.05 (Be 97), from the early type stars. Our distance moduli/distances for only (B - V) color are (V-0-M-V,M- d[kpc]) = (13.40 +/- 0.10, 4.8 +/- 0.2 kpc) (Juc 9) and (12.40 +/- 0.12, 3.0 +/- 0.2 kpc) (Be 97), respectively. The Gaia DR2 distances are d = 4.5 +/- 1.2 kpc (Juc 9) and d = 3.1 +/- 0.7 kpc (Be 97) from the median parallaxes with sigma(& x3d6;)/& x3d6; < 0.20, which are in good agreement with the photometric distances within the uncertainties. The solar abundance PARSEC isochrones give us the intermediate ages, 30 +/- 10 Myr for Juc 9 and 100 +/- 30 Myr for Be 97

CCD UBV(RI)KC Photometry of the Open Clusters Juchert 9 and Berkeley 97

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

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 andheavy 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 appropriatePARSEC isochrones.The estimated reddening of NGC 2323 is E(B-V)=0.23±0.04 using 11 early type stars. For NGC 2539, we findE(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 ($=0.998±0.136 mas) for the likely members of NGC 2323 isin concordance with its four colour photometric distances 910–1000 pc. For NGC 2539, its GaiaDR2 distanced=1330±250 pc ($=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, forNGC 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±50pc 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.</p