ACS photometry of the globular cluster B514

Abstract

We present deep F606W, F814W ACS photometry of the recently discovered globular cluster B514, the outermost known globular in the M31 galaxy. The cluster appears quite extended and member stars are unequivocally identified out to ~200 pc from the center. The Color Magnitude Diagram reveals a steep Red Giant Branch (RGB), and a Horizontal Branch (HB) extending blue ward of the instability strip, indicating that B514 is a classical old metal-poor globular cluster. The RGB locus and the position of the RGB Bump are both consistent with a metallicity [Fe/H] ~ -1.8, in excellent agreement with spectroscopic estimates. A preliminary estimate of the integrated absolute V magnitude (M_V< -9.1) suggests that B514 is among the brightest globulars of M31.

arXiv comment4 pages, 3 figures. Accepted for publication in ApJ Letters

References in corpus (13)

• The Photometric Performance and Calibration of the HST Advanced Camera For Surveys
• WFPC2 Stellar Photometry with HSTphot
• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• A giant stream of metal-rich stars in the halo of the galaxy M31
• Homogeneous Photometry for Star Clusters and Resolved Galaxies. II. Photometric Standard Stars
• The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features
• 2MASS NIR photometry for 693 candidate globular clusters in M31 and the Revised Bologna Catalogue
• Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system
• Building up the globular cluster system of the Milky Way. The contribution of the Sagittarius galaxy
• Measuring Mass Loss Rates from Galactic Satellites
• An updated survey of globular clusters in M 31. I. Classification and radial velocity for 76 candidate clusters
• Stellar Cluster Fiducial Sequences with the Advanced Camera for Surveys
• The outermost cluster of M31

Cited by in corpus (22)

• The SLUGGS Survey: Calcium Triplet-based Spectroscopic Metallicities for Over 900 Globular Clusters
• An updated survey of globular clusters in M31. II Newly discovered bright and remote clusters
• ACS photometry of newly-discovered globular clusters in the outer halo of M31
• An updated survey of globular clusters in M 31. III. A spectroscopic metallicity scale for the Revised Bologna Catalog
• An HST/ACS View of the Inhomogeneous Outer Halo of M31
• The young stellar population at the center of NGC 205
• RR Lyrae variables in M32 and the disk of M31
• The surface brightness profile of the remote cluster NGC 2419
• Structural Parameters of Mayall II = G1 in M31
• HST/ACS colour-magnitude diagrams of M31 globular clusters
• The extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars
• The horizontal branch luminosity vs metallicity in M31 globular clusters
• HST/ACS color-magnitude diagrams of candidate intermediate-age M 31 globular clusters. The role of blue horizontal branches
• A very dark stellar system lost in Virgo: kinematics and metallicity of SECCO1 with MUSE
• Age and structure parameters of a remote M31 globular cluster B514 based on HST, 2MASS, GALEX and BATC observations
• The Role of Dust in Models of Population Synthesis
• The Variable Star Population of the Globular Cluster B514 in the Andromeda Galaxy
• The horizontal branch morphology of M31 globular clusters. Extreme second parameter effect in outer halo clusters
• An HST/WFPC2 survey of bright young clusters in M31. IV. Ages and mass estimates
• HST-ACS photometry of the isolated dwarf galaxy VV124=UGC4879. Detection of the Blue Horizontal Branch and identification of two young star clusters
• 2MASS photometry and age estimate of globular clusters in the outer halo of M31
• A near-ultraviolet view of the Inner Region of M31 with the Large Binocular Telescope