J/MNRAS/453/4185 NGC 2355 BVI photometry (Donati+, 2015) ================================================================================ Photometric and spectroscopic study of the intermediate-age open cluster NGC 2355. Donati P., Bragaglia A., Carretta E., D'Orazi V., Tosi M., Cusano F., Carini R. =2015MNRAS.453.4185D (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Clusters, open ; Photometry, UBVRI Keywords: Hertzsprung-Russell and colour-magnitude diagrams - Galaxy: disc - open clusters and associations: general - open clusters and associations: individual: NGC 2355 Abstract: 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-term programme Bologna Open Clusters Chemical Evolution. NGC 2355 was observed with the Large Binocular Camera at the Large Binocular Telescope using the Bessel B, V, and Ic filters. The cluster parameters have been obtained using the synthetic colour-magnitude diagram method, as done in other papers of this series. Additional spectroscopic observations with the Fibre-fed Echelle Spectrograph at the Nordic Optical Telescope of three giant stars were used to determine the chemical properties of the cluster. Our analysis shows that NGC 2355 has metallicity slightly less than solar, with [Fe/H]=-0.06dex, age between 0.8 and 1Gyr, reddening E(B-V) in the range 0.14-0.19mag, and distance modulus (m-M)0 of about 11mag. We also investigate the abundances of O, Na, Al, {alpha}, iron-peak, and neutron capture elements, showing that NGC 2355 falls within the abundance distribution 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. Description: The cluster was observed as part of the BOCCE programme using Large Binocular Camera (LBC) mounted at LBT on Mount Graham (AZ, USA). All data were acquired during one night (2012 February 22), with seeing of about 1.6 arcsec and using the Johnson-Cousins filters (B on LBC-Blue and V, I on LBC-Red). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file photom.dat 149 4791 BVI photometric catalogue -------------------------------------------------------------------------------- See also: J/PASJ/56/295 : BVIc photometry of old open clusters (Hasegawa+, 2004) J/A+A/429/607 : BV photometry of Berkeley 36, 73 and 34 (Ortolani+, 2005) J/A+A/464/573 : VI photometry of 5 open clusters (Carraro+, 2007) J/MNRAS/424/1132 : BVI photometry of Be 27, Be 24 and Be 36 (Donati+, 2012) Byte-by-byte Description of file: photom.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 I6 --- ID ID number 9- 11 A3 --- Chip Chip 14- 22 F9.4 pix Xpos X position 24- 32 F9.4 pix Ypos Y position 36- 46 F11.7 deg RAdeg Right ascension (J2000) 51- 60 F10.7 deg DEdeg Declination (J2000) 65- 72 F8.5 mag Mod Distance modulus, (m-M)0 76- 81 F6.3 mag Bmag ?=99.999 Bessel B magnitude 83- 88 F6.3 mag e_Bmag ?=99.999 rms uncertainty on Bmag 91- 96 F6.3 mag Vmag ?=99.999 Bessel V magnitude calibrated using (B-V) color index 98-103 F6.3 mag e_Vmag ?=99.999 rms uncertainty on Vmag 105-110 F6.3 mag V2mag ?=99.999 Bessel V2 magnitude calibrated using (V-I) color index 112-117 F6.3 mag e_V2mag ?=99.999 rms uncertainty on V2mag 120-125 F6.3 mag Imag ?=99.999 Bessel Ic magnitude 127-132 F6.3 mag e_Imag ?=99.999 rms uncertainty on Imag 136-141 F6.3 --- chi2 Chi square of the PSF photometry 144-149 F6.3 --- sh Sharpness index of the PSF photometry (0=star; <0=cosmic rays; >0=extended) -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 20-Jun-2016