• UBVI CCD photometry of Berkeley 55 open cluster

    • Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • 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



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

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.