• UBVI CCD photometry of Berkeley 55 open cluster

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      https://www.ias.ac.in/article/fulltext/joaa/042/0060

    • Keywords

       

      Open clusters and associations; individual Berkeley 55-stars; early-type stars evolution; late-type supergiants.

    • Abstract

       

      Fundamental astrophysical parameters have been derived for Berkeley 55 (Be 55) open cluster based on the UBVI charge-coupled device (CCD) photometric data observed using a AZT-22 1.5 m telescope at Maidanak Astronomical Observatory (MAO) in Uzbekistan. The mean reddening is obtained as $E(B-V)=1.77 \pm 0.10$ mag from early-type members. The zero-age main sequence fitting in the $Q_{V\lambda} – Q^{\prime}$ diagrams indicates the distance modulus, $(V_0 -M_V)= 12.4\pm 0.20$ mag ($d = 3.02 \pm 0.28$ kpc). This photometric distance is consistent with the distances of Gaia EDR3 ($d= 3.09\pm 0.16$ kpc) and period–luminosity relation ($d = 2.78 \pm 0.32$ kpc) of its Cepheid S5 within the uncertainties. This distance also locates thecluster near the Perseus spiral arm. The Geneva isochrone fittings to the Hertzsprung–Russell diagram and observational colour–magnitude diagrams derive turn-off age, $85 \pm 13$ Myr, by taking care of five red supergiants/bright giants. The possible inconsistencies in the locations of the bright giants with the rotating/non-rotating isochrones may be due to both the age spread of stars in young open clusters and the diversity in rotational velocities.

    • Author Affiliations

       

      İNCI AKKAYA ORALHAN1

      1. Department of Astronomy and Space Sciences, Science Faculty, Erciyes University, 38039 Kayseri, Turkey.
    • Dates

       
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