RR Lyrae stars and the horizontal branch of NGC 5904 (M5)

Abstract

We report the distance and [Fe/H] value for the globular cluster NGC 5904 (M5) derived from the Fourier decomposition of the light curves of selected RRab and RRc stars. The aim in doing this was to bring these parameters into the homogeneous scales established by our previous work on numerous other globular clusters, allowing a direct comparison of the horizontal branch luminosity in clusters with a wide range of metallicities. Our CCD photometry of the large variable star population of this cluster is used to discuss light curve peculiarities, like Blazhko modulations, on an individual basis. New Blazhko variables are reported. From the RRab stars we found [Fe/H]${}_{\mathrm{UVES}}=-1.335\pm 0.003(\mathrm{statistical})\pm 0.110(\mathrm{systematic})$, and a distance of $7.6\pm 0.2$ kpc, and from the RRc stars we found [Fe/H]${}_{\mathrm{UVES}}$ = $-1.39\pm 0.03(\mathrm{statistical})\pm 0.12(\mathrm{systematic})$ and a distance of $7.5\pm 0.3$ kpc. The results for RRab and RRc stars should be considered independent since they come from different calibrations and zero points. Absolute magnitudes, radii and masses are also reported for individual RR Lyrae stars. The distance to the cluster was calculated by alternative methods like the P-L relation of SX Phe and the luminosity of the stars at the tip of the red giant branch; we obtained $7.7\pm 0.4$ and $7.2-7.5$ kpc respectively. The distribution of RR Lyrae stars in the instability strip is discussed and compared with other clusters in connection with the Oosterhoff and horizontal branch type. The Oosterhoff type II clusters systematically show a RRab-RRc segregation about the instability strip first-overtone red edge, while the Oosterhoff type I clusters may or may not display this feature. A group of RR Lyrae stars is identified in an advanced evolutionary stage, and two of them are likely binaries with unseen companions.

29, pages, 13 figures, 5 tables. Accepted in Astrophysics and Space Science. arXiv admin note: text overlap with arXiv:1506.03145

References in corpus (47)

• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• Intrinsic iron spread and a new metallicity scale for Globular Clusters
• Homogeneous Photometry for Star Clusters and Resolved Galaxies. II. Photometric Standard Stars
• The Ages of 55 Globular Clusters as Determined Using an Improved delta V_TO^HB Method Along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues
• The ACS Survey of Galactic Globular Clusters. IX. Horizontal Branch Morphology and the Second Parameter Phenomenon
• Variable Stars in Galactic Globular Clusters
• Horizontal Branch Stars: The Interplay between Observations and Theory, and Insights into the Formation of the Galaxy
• The RR Lyrae Period-Luminosity Relation. I. Theoretical Calibration
• A multi-color and Fourier study of RR Lyrae variables in the globular cluster NGC 5272 (M3)
• Light and Motion in SDSS Stripe 82: The Catalogues
• Photometric Calibration of the Supernova Legacy Survey Fields
• CCD Photometry of the Globular Cluster M5. I. The Color-Magnitude Diagram and Luminosity Functions
• Difference Image Analysis: Extension to a Spatially Varying Photometric Scale Factor and Other Considerations
• Isochrones for Old (> 5 Gyr) Stars and Stellar Populations. I. Models for $-2.4\le$ [Fe/H] $\le +0.6$, $0.25\le Y\le 0.33$, and $-0.4\le$ [$\alpha$\Fe] $\le +0.4$
• Particle-physics constraints from the globular cluster M5: Neutrino Dipole Moments
• [Fe/H] relations for c-type RR Lyrae Variables based upon Fourier Coefficients
• The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda VI
• The RR Lyrae variables and Horizontal Branch of NGC6656 (M22)
• Empirical relations for cluster RR Lyrae stars revisited
• The double-mode nature of the HADS star GSC 00144-03031 and the Petersen diagram of the class
• The Topology of RR Lyrae Instability Strip and the Oosterhoff Dichotomy
• Exploring the variable stars in the globular cluster NGC5024 (M53): New RR Lyrae and SX Phoenicis stars
• CCD time-series photometry of the globular cluster NGC 6981: Variable star census and physical parameter estimates
• Systematic Trends In Sloan Digital Sky Survey Photometric Data
• The RR Lyrae U Com as a test for nonlinear pulsation models
• Variable stars in the Globular Cluster NGC 2808
• Linear nonadiabatic properties of SX Phoenicis variables
• Variable Stars in the Globular Cluster M5. Application of the Image Subtraction Method
• Multiple Populations in Globular Clusters and the Origin of the Oosterhoff Period Groups
• New SX Phoenicis Stars in the Globular Cluster M53
• Long-term photometric monitoring of Messier 5 variables: II. Blazhko stars
• Long-term photometric monitoring of Messier 5 variables: I. Period changes of RR Lyrae stars
• RR Lyrae variables in M5 as a test of pulsational theory
• The ages and distances of globular clusters with the luminosity function method: the case of M5 and M55
• A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry
• Revisiting the variable star population in NGC~6229 and the structure of the Horizontal Branch
• Stellar Evolution and Variability in the Pre-ZAHB Phase
• The unusually large population of Blazhko variables in the globular cluster NGC 5024 (M53)
• Two Distant Halo Velocity Groups Discovered by the Palomar Transient Factory
• A Census of Variability in Globular Cluster M68 (NGC 4590)
• CCD PHOTOMETRY OF RR LYRAE STARS IN M5 AS A TEST FOR THE PULSATIONAL SCENARIO
• Difference image analysis: The interplay between the photometric scale factor and systematic photometric errors
• Stellar Populations and Variable Stars in the Core of the Globular Cluster M5
• Fourier Decomposition of RR Lyrae light curves and the SX Phe population in the central region of NGC 3201
• An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data
• The outer-halo globular cluster NGC 6229. III. Deep CCD photometry
• A photometric survey for variable stars in the globular cluster M5

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