Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

A Wide View of the Galactic Globular Cluster NGC 2808: Red Giant and Horizontal Branch Star Spatial Distributions

Journal Article · · The Astronomical Journal
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [1];  [7];  [8]
  1. Space Telescope Science Institute, Baltimore, MD (United States)
  2. Univ. of California, Irvine, CA (United States)
  3. Istituto Nazionale di Astrofisica (INAF) (Italy)
  4. Indiana Univ., Bloomington, IN (United States)
  5. Univ. of Rome (Italy)
  6. PSL Research University, Meudon (France); Centre National de la Recherche Scientifique (CNRS) (France)
  7. National Optical-Infrared Astronomy Research Laboratory (NOIRLab), La Serana (Chile)
  8. Univ. of Vienna (Austria)
+ Show Author Affiliations

Wide-field and deep DECam multiband photometry, combined with HST data for the core of the Galactic globular cluster NGC 2808, allowed us to study the distribution of various stellar subpopulations and stars in different evolutionary phases out to the cluster tidal radius. We used the Cugi = (u - g) - (g - i) index to identify three chemically distinct subpopulations along the red giant branch and compared their spatial distributions. The most light-element-enriched subpopulation (P3) is more centrally concentrated; however, it shows a more extended distribution in the external regions of the cluster compared to the primordial (P1) and intermediate (P2) composition populations. Furthermore, the P3 subpopulation centroid is off-center relative to those of the P1 and P2 groups. We also analyzed the spatial distribution of horizontal branch stars and found that the relative fraction of red horizontal branch stars increases for radial distances larger than ≈1$$^{'}_{.}$$5, while that of the blue and hotter stars decreases. These new observations, combined with literature spectroscopic measurements, suggest that the red horizontal branch stars are the progeny of all the stellar subpopulations in NGC 2808, i.e., primordial and light-element enhanced, while the blue stars are possibly the result of a combination of the "hot-flasher" and the "helium-enhanced" scenarios. A similar distribution of different red giant branch subpopulations and horizontal branch stars was also found for the most massive Galactic globular cluster, ω Cen, based on combined DECam and HST data, which suggests that the two may share a similar origin.

Research Organization:
US Department of Energy (USDOE), Washington, DC (United States). Dark Energy Survey (DES) Collaboration
Sponsoring Organization:
USDOE
OSTI ID:
2424723
Journal Information:
The Astronomical Journal, Journal Name: The Astronomical Journal Journal Issue: 1 Vol. 166; ISSN 0004-6256
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (75)

Na-O anticorrelation and HB: VII. The chemical composition of first and second-generation stars in 15 globular clusters from GIRAFFE spectra journal July 2009
The second and third parameters of the horizontal branch in globular clusters journal July 2010
The hot horizontal-branch stars inω Centauri journal January 2011
The connection between missing AGB stars and extended horizontal branches journal November 2010
Mining SDSS in search of multiple populations in globular clusters journal December 2010
A lack of close binaries among hot horizontal branch stars in globular clusters journal March 2011
The Na-O anticorrelation in horizontal branch stars journal October 2011
Gaia Data Release 2 : Kinematics of globular clusters and dwarf galaxies around the Milky Way★ journal August 2018
Shotglas journal October 2018
A stellar census in globular clusters with MUSE: multiple populations chemistry in NGC 2808 journal October 2019
Robust statistical tools for identifying multiple stellar populations in globular clusters in the presence of measurement errors journal February 2022
Spectroscopic analyses of the blue hook stars in NGC 2808: A more stringent test of the late hot flasher scenario journal February 2004
On the horizontal branch of the galactic globular cluster NGC 2808 journal January 2006
The hottest horizontal-branch stars in $\mathsf{\omega}$ Centauri. Late hot flasher vs. helium enrichment journal October 2007
Modeling He-rich subdwarfs through the hot-flasher scenario journal September 2008
Catalogue of Galactic globular-cluster surface-brightness profiles journal January 1995
DAOPHOT - A computer program for crowded-field stellar photometry journal March 1987
On the growth-curve method for calibrating stellar photometry with CCDs journal August 1990
The relationship between infrared, optical, and ultraviolet extinction journal October 1989
The horizontal-branch stars in globular clusters. 2: The second parameter phenomenon journal March 1994
The Origin of Extreme Horizontal Branch Stars journal July 1996
CCD Photometry of Galactic Globular Clusters. V. NGC 2808 journal July 1999
Bimodality and Gaps on Globular Cluster Horizontal Branches. II. The Cases of NGC 6229, NGC 1851, and NGC 2808 journal February 1998
On the Helium Content of Galactic Globular Clusters via theR‐Parameter journal July 2000
Effects of Helium Mixing on the Evolution of Globular Cluster Stars journal January 1997
Peculiar Multimodality on the Horizontal Branch of the Globular Cluster NGC 2808 journal May 1997
The Second-Parameter Effect in Metal-rich Globular Clusters journal July 1998
Flash Mixing on the White Dwarf Cooling Curve: Understanding Hot Horizontal Branch Anomalies in NGC 2808 journal November 2001
The Initial Helium Content of Galactic Globular Cluster Stars from theR‐Parameter: Comparison with the Cosmic Microwave Background Constraint journal May 2003
The Chemical Composition Contrast between M3 and M13 Revisited: New Abundances for 28 Giant Stars in M3 journal April 2004
The Early Evolution of Globular Clusters: The Case of NGC 2808 journal August 2004
Super-Helium-rich Populations and the Origin of Extreme Horizontal-Branch Stars in Globular Clusters journal February 2005
A Helium Spread among the Main‐Sequence Stars in NGC 2808 journal October 2005
Resolved Massive Star Clusters in the Milky Way and Its Satellites: Brightness Profiles and a Catalog of Fundamental Parameters journal December 2005
A Robust Test of Evolution near the Tip of the Red Giant Branch and Missing Giants in NGC 2808 journal December 2006
The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters without Previous Hubble Space Telescope Photometry journal March 2007
Star Counts in the Globular Cluster ω Centauri. I. Bright Stellar Components journal July 2007
A Triple Main Sequence in the Globular Cluster NGC 2808 journal April 2007
The Link between Chemical Anomalies along the Red Giant Branch and the Horizontal Branch Extension in Globular Clusters journal November 2007
THE HUBBLE SPACE TELESCOPE UV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS. I. OVERVIEW OF THE PROJECT AND DETECTION OF MULTIPLE STELLAR POPULATIONS journal February 2015
On the Radial Distribution of Horizontal Branch Stars in ngc 2808 journal April 2009
Hot Horizontal Branch Stars in ω Centauri: Clues About Their Origin from the Cluster Color Magnitude Diagram journal August 2009
Measuring Reddening with Sloan Digital sky Survey Stellar Spectra and Recalibrating sfd journal August 2011
Evolution of Second-Generation Stars in Stellar Disks of Globular and Nuclear Clusters: ω Centauri as a test case journal November 2013
A Helium-Carbon Correlation on the Extreme Horizontal Branch in ω Centauri journal October 2014
THE HUBBLE SPACE TELESCOPE UV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS. III. A QUINTUPLE STELLAR POPULATION IN NGC 2808 journal July 2015
Five Groups of red Giants with Distinct Chemical Composition in the Globular Cluster ngc 2808 journal September 2015
THE INFRARED EYE OF THE WIDE-FIELD CAMERA 3 ON THE HUBBLE SPACE TELESCOPE REVEALS MULTIPLE MAIN SEQUENCES OF VERY LOW MASS STARS IN NGC 2808 journal July 2012
Oxygen and Sodium Abundances in m13 (ngc 6205) Giants: Linking Globular Cluster Formation Scenarios, deep Mixing, and Post-Rgb Evolution journal July 2012
THE HUBBLE SPACE TELESCOPE UV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS: THE INTERNAL KINEMATICS OF THE MULTIPLE STELLAR POPULATIONS IN NGC 2808 journal August 2015
Blanco DECam Bulge Survey (BDBS) II: project performance, data analysis, and early science results journal September 2020
Gaia EDR3 view on galactic globular clusters journal May 2021
Dynamical evolution of multiple-population globular clusters journal January 2021
The chemical compositions of multiple stellar populations in the globular cluster NGC 2808 journal December 2022
Early dynamical evolution of rotating star clusters in a tidal field journal March 2022
Dynamical evolution and spatial mixing of multiple population globular clusters journal January 2013
Early disc accretion as the origin of abundance anomalies in globular clusters journal October 2013
The SUMO project I. A survey of multiple populations in globular clusters journal March 2013
The Hubble Space Telescope UV Legacy Survey of galactic globular clusters – II. The seven stellar populations of NGC 7089 (M2)⋆ journal December 2014
Multiple populations in globular clusters: the distinct kinematic imprints of different formation scenarios journal April 2015
TheHubble Space TelescopeUV Legacy Survey of Galactic globular clusters – X. The radial distribution of stellar populations in NGC 2808 journal August 2016
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters – IX. The Atlas of multiple stellar populations journal October 2016
A single model for the variety of multiple-population formation(s) in globular clusters: a temporal sequence journal February 2016
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters – XVII. Public Catalogue Release journal September 2018
Investigation of the globular cluster NGC 2808 with the Ultra-Violet Imaging Telescope journal February 2019
Light element discontinuities suggest an early termination of star formation in the globular cluster NGC 6402 (M14) journal March 2019
Globular cluster number density profiles using Gaia DR2 journal March 2019
The fraction of second generation stars in globular clusters from the analysis of the horizontal branch★ journal October 2008
Formation and dynamical evolution of multiple stellar generations in globular clusters journal December 2008
Second-Generation Stellar Disks in Dense star Clusters and Cluster Ellipticities journal May 2016
The Not So Simple Globular Cluster ω Cen. I. Spatial Distribution of the Multiple Stellar Populations journal March 2017
New Subgrouping of Multiple Stellar Populations in NGC 2808 Based on Low-resolution Spectroscopy journal September 2021
The Not So Simple Stellar System ω Cen. II. Evidence in Support of a Merging Scenario journal March 2020
Updated BaSTI Stellar Evolution Models and Isochrones. II. α-enhanced Calculations journal February 2021
HST Observations of the Globular Cluster NGC 6402 (M14) and Its Peculiar Multiple Populations journal February 2022

Similar Records

THE DISCOVERY OF PULSATING HOT SUBDWARFS IN NGC 2808
Journal Article · Sat Nov 09 23:00:00 EST 2013 · Astrophysical Journal Letters · OSTI ID:22215380
ON THE RADIAL DISTRIBUTION OF HORIZONTAL BRANCH STARS IN NGC 2808
Journal Article · Sun May 10 00:00:00 EDT 2009 · Astrophysical Journal (Online) · OSTI ID:21300725
THE HUBBLE SPACE TELESCOPE UV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS. VII. IMPLICATIONS FROM THE NEARLY UNIVERSAL NATURE OF HORIZONTAL BRANCH DISCONTINUITIES
Journal Article · Sun May 01 00:00:00 EDT 2016 · Astrophysical Journal · OSTI ID:22663066

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS