Open Astronomy (Mar 2011)

Vilnius Multicolor CCD Photometry of the Open Cluster NGC 752

  • Bartašiūtė S.,
  • Janusz R.,
  • Boyle R. P.,
  • Philip A. G. Davis

DOI
https://doi.org/10.1515/astro-2017-0267
Journal volume & issue
Vol. 20, no. 1
pp. 27 – 52

Abstract

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We have performed multicolor CCD observations of the central area of NGC 752 to search for faint, low-mass members of this open cluster. Four 12’ x 12’ fields were taken on the 1.8 m Vatican Advanced Technology Telescope (Mt. Graham, Arizona) using a 4K CCD camera and eight intermediate-band filters of the Strömvil (Strömgren + Vilnius) system. In this paper we present a catalog of photometry for 405 stars down to the limiting magnitude V = 18.5, which contains V magnitudes and color indices of the Vilnius system, together with photometric determinations of spectral types, absolute magnitudes MV, interstellar reddening values EY−V and metallicity parameters [Fe/H]. The good quality multicolor data made it possible to identify the locus of the lower main sequence to four magnitudes beyond the previous (photographic) limit. A relatively small number of photometric members identified at faint magnitudes seems to be indicative of actual dissolution of the cluster from the low-mass end.

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