New variable stars in NGC 6652 and its background Sagittarius stream
arXiv:1812.03605 · doi:10.3847/1538-3881/aaf796
Abstract
We conducted a variable star search on the metal-rich Galactic globular cluster NGC 6652 using archival Gemini-S/GMOS data. We report the discovery of nine new variable stars in the NGC 6652 field, of which we classify six as eclipsing binaries and one as SX Phoenicis stars, leaving two variables without classification. Using proper motions from Gaia DR2 and HST, albeit with some uncertainties, we find that the cluster, the field, and the background Sagittarius stream, have 3 of these variables each. We also reassess the membership of known variables based on the Gaia proper motions, confirming the existence of one RR Lyrae star in the cluster.
AJ accepted
References in corpus (29)
- Gaia Data Release 2. Summary of the contents and survey properties
- Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
- The Gaia mission
- The Dartmouth Stellar Evolution Database
- A method for optimal image subtraction
- The SDSS View of the Palomar-Green Bright Quasar Survey
- Abundances for Globular Cluster Giants: I. Homogeneous Metallicities for 24 Clusters
- The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry
- Variable Stars in Galactic Globular Clusters
- Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy
- Proper motions and kinematics of selected bulge globular clusters
- Cluster AgeS Experiment. Catalog of Variable Stars in the Globular Cluster Omega Centauri
- Chemical abundances of hydrostatic and explosive alpha-elements in Sagittarius stream stars
- Identification of the LMXB and Faint X-ray Sources in NGC 6652
- The ACS Survey of Galactic Globular Clusters XI: The Three-Dimensional Orientation of the Sagittarius Dwarf Spheroidal Galaxy and its Globular Clusters
- The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. VIII. Preliminary Public Catalog Release
- Linear nonadiabatic properties of SX Phoenicis variables
- A Highly Eccentric 3.9-Millisecond Binary Pulsar in the Globular Cluster NGC 6652
- The Age of the Inner Halo Globular Cluster NGC 6652
- Hubble Space Telescope Proper Motions along the Sagittarius Stream: I. Observations and Results for Stars in Four Fields
- Searching for variable stars in the cores of five metal rich globular clusters using EMCCD observations
- Discovery of > 200 RR Lyrae Variables in M62: An Oosterhoff I Globular Cluster with a Predominantly Blue HB
- Discovery of a Variable Star Population in NGC 2808
- Blue Straggler Star Populations in Globular Clusters: II. Proper-Motion Cleaned HST Catalogs of BSSs in 38 Galactic GCs
- A 2.15 Hour Orbital Period for the Low Mass X-Ray Binary XB 1832-330 in the Globular Cluster NGC 6652
- EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981
- An AO-assisted variability study of four globular clusters
- Stellar variability at the main-sequence turnoff of the intermediate-age LMC cluster NGC 1846
- The Unusual X-ray Binaries of the Globular Cluster NGC 6652