WIYN Open Cluster Study. LXXII. A uvbyCa Hbeta CCD Analysis of the Metal-Deficient Open Cluster, NGC 2506

Abstract

Precision uvbyCa Hbeta photometry of the metal-deficient, old open cluster, NGC 2506, is presented. The survey covers an area 20 by 20 arcminutes, and extends to V~18 for b-y and Hbeta and to V~17.0 for c_1 and hk. For V < 16.0, photometric scatter among the indices leads to the recovery of 6 known variables within the cluster core and 5 new variables in the outer 5 arcmin of the survey field. Proper motions, radial velocities, and precise multicolor indices are used to isolate a highly probable sample of cluster members from the very rich color-magnitude diagram (CMD). From 257 highly probable members at the cluster turnoff, we derive a reddening estimate of E(b-y) = 0.042 +/- 0.001 (E(B-V) = 0.058 +/- 0.001), where the errors refer to the internal standard errors of the mean. [Fe/H] is derived from the A/F dwarf members using both m_1 and hk, leading to [Fe/H] = -0.296 +/- 0.011 (sem) and -0.317 +/- 0.004 (sem), respectively. The weighted average, heavily dominated by hk, is [Fe/H] = -0.316 +/- 0.033. Based upon red giant members, we place an upper limit of +/- 0.010 on the variation in the reddening across the face of the cluster. We also identify two dozen potential red giant cluster members outside the cluster core. Victoria-Regina isochrones on the Stromgren system produce an excellent match to the cluster for an apparent modulus of (m-M) = 12.75 +/- 0.1 and an age of 1.85 +/- 0.05 Gyr.

arXiv commentAccepted for Astronomical Journal, 12 pages, 8 figures

References in corpus (30)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• New catalogue of optically visible open clusters and candidates
• Astrophysical parameters of Galactic open clusters
• The Victoria-Regina Stellar Models: Evolutionary Tracks and Isochrones for a Wide Range in Mass and Metallicity that Allow for Empirically Constrained Amounts of Convective Core Overshooting
• Some Revised Observational Constraints on the Formation and Evolution of the Galactic Disk
• On the metallicity of open clusters. III. Homogenised sample
• Chemical abundance analysis of the Open Clusters Cr110, NGC2099 (M37), NGC2420, NGC7789 and M67 (NGC2682)
• The age of the oldest Open Clusters
• On the relationship between the Delta Scuti and Gamma Doradus pulsators
• A Chemical Abundance Study of 10 Open Clusters Based on WIYN-Hydra Spectroscopy
• Iron abundances from high-resolution spectroscopy of the open clusters NGC 2506, NGC 6134, and IC 4651
• Comprehensive abundance analysis of red giants in the open clusters NGC 752, NGC 1817, NGC 2360 and NGC 2506
• Consistent metallicity scale for cool dwarfs and giants. A benchmark test using the Hyades
• Lithium in the Intermediate-Age Open Cluster, NGC 3680
• Zeroing the Stellar Isochrone Scale: The Red Giant Clump Luminosity at Intermediate Metallicity
• Lithium Abundances of the Super-Metal-Rich Open Cluster NGC 6253
• Chemical composition of evolved stars in the open cluster NGC 2506
• Old open clusters: UBGVRI photometry of NGC 2506
• Lithium abundance in the metal-poor open cluster NGC 2243
• WIYN Open Cluster Study. XXXIX. Abundances in NGC 6253 from HYDRA Spectroscopy of the Li 6708 A Region
• CCD uvbyHbeta Photometry in Clusters: I. The Open Cluster Standard, IC 4651
• A uvbyCaHbeta Analysis of the Old Open Cluster, NGC 6819
• vbyCaHbeta CCD Photometry of Clusters. VI. The Metal-Deficient Open Cluster NGC 2420
• Oscillating Blue Stragglers, gamma Doradus stars and eclipsing binaries in the open cluster NGC2506
• A uvbyCaHbeta CCD Analysis of the Open Cluster Standard, NGC 752
• uvbyCaHbeta CCD Photometry of Clusters. V. The Metal-Deficient Open Cluster NGC 2243
• Deep and Wide Photometry of Two Open Clusters NGC 1245 and NGC 2506: Dynamical Evolution and Halo
• Properties of the open cluster Tombaugh 1 from high resolution spectroscopy and uvbyCaH$\beta$ photometry
• Deep and Wide Photometry of Two Open Clusters NGC 1245 and NGC 2506: CCD Observation and Physical Properties

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