UB CCD photometry of the old, metal rich, open clusters NGC 6791, NGC 6819 and NGC 7142

Abstract

We report on a UV-oriented imaging survey in the fields of the old, metal-rich open clusters, NGC 6791, NGC 6819 and NGC 7142. These three clusters represent both very near and ideal stellar aggregates to match the distinctive properties of the evolved stellar populations, as in elliptical galaxies and bulges of spirals. The CMD of the three clusters is analyzed in detail, with special emphasis to the hot stellar component. We report, in this regard, one new extreme horizontal-branch star candidate in NGC 6791. For NGC 6819 and 7142, the stellar luminosity function points to a looser radial distribution of faint lower Main Sequence stars, either as a consequence of cluster dynamical interaction with the Galaxy or as an effect of an increasing fraction of binary stars toward the cluster core, as actually observed in NGC 6791 too.

arXiv comment12 pages with 15 Figures & 5 Tables. To appear in the Astronomical Journal

References in corpus (26)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
• Scaled solar tracks and isochrones in a large region of the Z-Y plane I. From the ZAMS to the TP-AGB end for 0.15 - 2.5 Mo stars
• Some Revised Observational Constraints on the Formation and Evolution of the Galactic Disk
• Metal Abundances of Red Clump Stars in Open Clusters: I. NGC 6819
• Ultraviolet Radiation from Evolved Stellar Populations: II. The Ultraviolet Upturn Phenomenon in Elliptical Galaxies
• WFPC2 Observations of Star Clusters in the Magellanic Clouds. II. The Oldest Star Clusters in the Small Magellanic Cloud
• NGC 6791: an exotic open cluster or the nucleus of a tidally disrupted galaxy?
• Old open clusters in the outer Galactic disk
• The Bologna Open Cluster Chemical Evolution (BOCCE) Project: midterm results from the photometric sample
• Shaping the Globular Cluster Mass Function by Stellar-Dynamical Evaporation
• The First Empirical Mass Loss Law for Population II Giants
• The CFHT Open Star Cluster Survey II -- Deep CCD Photometry of the Old Open Star Cluster NGC 6819
• The metallicity of the old open cluster NGC 6791
• High resolution infrared spectroscopy of the old open cluster NGC6791
• The Puzzling White Dwarf Cooling Sequence in NGC6791: A Simple Solution
• The Hot Stars of Old Open Clusters: M67, NGC 188 and NGC6791
• A New Look at the Old Star Cluster NGC 6791
• Infrared Photometry of NGC 6791
• An Extinction Map and Color Magnitude Diagram for the Globular Cluster NGC 3201
• vbyCaHbeta CCD Photometry of Clusters. VIII. The Super-Metal Rich, Old Open Cluster NGC 6791
• Metallicities and Radial Velocities of Five Open Clusters Including a New Candidate Member of the Monoceros Stream
• Evidence for Extended Star Formation in the Old, Metal-Rich Open Cluster, NGC 6791?
• Stellar lifetime and ultraviolet properties of the old metal-rich Galactic open cluster NGC6791: a pathway to understand the UV upturn of elliptical galaxies
• Mass Loss On the Horizontal Branch: an Application to NGC6791
• AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies

Cited by in corpus (7)

• WIYN Open Cluster Study. LIX. Radial-Velocity Membership of the Evolved Population of the Old Open Cluster NGC 6791
• Some Stars are Totally Metal: A New Mechanism Driving Dust Across Star-Forming Clouds, and Consequences for Planets, Stars, and Galaxies
• CCD UBV photometry of the open cluster NGC 6819
• Comparison of the Asteroseismic Mass Scale of Red Clump Giants with Photometric Mass Estimates
• Study of the Open Clusters in Kepler Prime Field
• WIYN Open Cluster Study LXXX: HDI CCD $UBVRI$ Photometry of the Old Open Cluster NGC 7142 and Comparison to M67
• NGC 4337: an over-looked old cluster in the inner disc of the Milky Way