Photometric and spectroscopic study of the intermediate-age open cluster NGC 2355

P. Donati, A. Bragaglia, E. Carretta, V. D'Orazi, M. Tosi, F. Cusano, R. Carini

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    In this paper we analyse the evolutionary status and properties of the old open cluster NGC 2355, located in the Galactic anticentre direction, as a part of the long termprogramme BOCCE. NGC 2355 was observed with LBCatLBT using the Bessel B, V , and Ic filters. The cluster parameters have been obtained using the synthetic colour- magnitude diagram (CMD) method, as done in other papers of this series. Additional spectroscopic observations with FIESatNOT of three giant stars were used to deter- mine the chemical properties of the cluster. Our analysis shows that NGC 2355 has metallicity slightly less than solar, with [Fe/H]= -0:06 dex, age between 0.8 and 1 Gyr, reddening E(B - V ) in the range 0.14 and 0.19 mag, and distance modulus (m-M)0 of about 11 mag. We also investigated the abundances of O, Na, Al, α, iron-peak, and neutron capture elements, showing that NGC 2355 falls within the abundance distri- bution of similar clusters (same age and metallicity). The Galactocentric distance of NGC 2355 places it at the border between two regimes of metallicity distribution; this makes it an important cluster for the study of the chemical properties and evolution of the disc.

    Original languageEnglish
    Pages (from-to)4185-4202
    Number of pages18
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number4
    Publication statusPublished - 11 Nov 2015


    • Hertzprung-Russell and colour-magnitude diagrams
    • galaxy: disc
    • open clusters and associations: general
    • open clusters and associations: individual: NGC 2355


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