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The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. X. The radial distribution of stellar populations in NGC 2808
- Publication Year :
- 2016
-
Abstract
- Due to their extreme helium abundance, the multiple stellar populations of the globular cluster NGC 2808 have been widely investigated from a photometric, spectroscopic, and kinematic perspective. The most striking feature of the color-magnitude diagram of NGC 2808 is the triple main sequence (MS), with the red MS corresponding to a stellar population with primordial helium, and the middle and the blue MS being enhanced in helium up to Y$\sim$0.32 and $\sim$0.38, respectively. A recent study has revealed that this massive cluster hosts at least five distinct stellar populations (A, B, C, D, and E). Among them populations A, B, and C correspond to the red MS, while populations C and D are connected to the middle and the blue MS. In this paper we exploit Hubble-Space-Telescope photometry to investigate the radial distribution of the red, the middle and the blue MS from the cluster center out to about 8.5 arcmin. Our analysis shows that the radial distribution of each of the three MSs is different. In particular, as predicted from multiple-population formation models, both the blue MS and the middle MS appears to be more concentrated than the red MS with a significance level for this result wich is above 3{\sigma}.<br />Comment: Accepted for publication in MNRAS
- Subjects :
- Stellar population
Hertzsprung–Russell diagram
chemistry.chemical_element
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Photometry (optics)
symbols.namesake
Globular clusters: individual: NGC2808
Hertzsprung
Magnitude diagrams
Russell and colour
Astronomy and Astrophysics
Space and Planetary Science
Hubble space telescope
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Helium
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
Physics
010308 nuclear & particles physics
Astronomy
Radial distribution
Astrophysics - Astrophysics of Galaxies
chemistry
Astrophysics - Solar and Stellar Astrophysics
Globular cluster
Astrophysics of Galaxies (astro-ph.GA)
symbols
Astrophysics::Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a9ec11f3b9abcb0cd61e18a70eda395f