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

Paolo Donati, Angela Bragaglia, Elisa Carretta, V. D'Orazi, Monica 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
Article number4185–4202
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 2015


  • Galaxy: disc
  • Hertzsprung-Russel and colour-magnitude diagrams
  • Open clusters and associations: general
  • Open clusters and associations: individual: NGC 2355

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