J/MNRAS/431/1995 Deep uVI photometry of NGC2419 (Beccari+, 2013) ================================================================================ Evidence for multiple populations in the massive globular cluster NGC2419 from deep uVI LBT photometry. Beccari G., Bellazzini M., Lardo C., Bragaglia A., Carretta E., Dalessandro E., Mucciarelli A., Pancino E. =2013MNRAS.431.1995B ================================================================================ ADC_Keywords: Clusters, globular ; Photometry Keywords: stars: evolution - globular clusters: individual: NGC 2419 Abstract: We present accurate wide-field uVI photometry of the remote and massive Galactic globular cluster NGC 2419, aimed at searching for the u-V colour spread along the red giant branch (RGB) which is generally interpreted as the photometric signature of the presence of multiple populations in globular clusters. Focusing on the RGB stars in the magnitude range 19.8<=V<=22.0, we find that (i) the u-V, u-I and the V-I spreads about the RGB ridge line are significantly larger than that expected from observational errors, accurately quantified by means of extensive artificial stars experiments, (ii) the intrinsic colour spreads in u-V and u-I are larger than in V-I, and (iii) the stars lying to the blue of the RGB ridge line in u-V and u-I are significantly more concentrated towards the cluster centre than those lying to the red of that line. All the above observational facts can be interpreted in a scenario where a sizable fraction of cluster stars belong to a second generation heavily enriched in helium. Finally, we find that bright RGB stars (17.50.0 lie preferentially on the blue side. Description: Photometry was acquired at the Large Binocular Telescope (LBT, Mount Graham, AZ, USA), on the night of 2011-10-23 under good seeing conditions (0.7-0.9arcsec) using the blue and red channels of the LBC (LBC-B and LBC-R, respectively) simultaneously. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file catalog.dat 71 7442 The complete photometric catalogue of NGC 2419 -------------------------------------------------------------------------------- See also: J/PASP/117/37 : BVRI photometry in NGC 2419, Pal 4, and Pal 14 (Saha+, 2005) J/AJ/136/2259 : HST photometry of stars in NGC 2419 (Sandquist+, 2008) J/ApJ/681/311 : Blue stragglers in NGC 2419 (Dalessandro+, 2008) J/AJ/141/81 : NGC 2419 variable star population (Di Criscienzo+, 2011) J/ApJ/738/186 : HST and DEIMOS measurements of NGC 2419 stars (Ibata+, 2011) J/ApJ/740/60 : Equivalent widths for NGC2419 & NGC7099 RGB stars (Cohen+ 2011) Byte-by-byte Description of file: catalog.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 I6 --- ID [100001/400598] Identification number 8- 9 I2 h RAh Right ascension (J2000) 11- 12 I2 min RAm Right ascension (J2000) 14- 19 F6.3 s RAs Right ascension (J2000) 21 A1 --- DE- Declination sign (J2000) 22- 23 I2 deg DEd Declination (J2000) 25- 26 I2 arcmin DEm Declination (J2000) 28- 32 F5.2 arcsec DEs Declination (J2000) 34- 39 F6.3 mag umag u_spec_ (SDSS) magnitude from blue camera 41- 45 F5.3 mag e_umag rms uncertainty on umag 47- 52 F6.3 mag Vmag V magnitude from red cameta 54- 58 F5.3 mag e_Vmag rms uncertainty on Vmag 60- 65 F6.3 mag Imag I magnitude from red cameta 67- 71 F5.3 mag e_Imag rms uncertainty on Imag -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 06-Jun-2014