Detection of a White Dwarf Companion to a Blue Straggler Star in the Outskirts of Globular Cluster NGC 5466 with the Ultraviolet Imaging Telescope (UVIT)

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dc.contributor.authorSahu, Snehalata
dc.contributor.authorSubramaniam, Annapurni
dc.contributor.authorSimunovic, Mirko
dc.contributor.authorPostma, J.
dc.contributor.authorCote, Patrick
dc.contributor.authorRao, N. Kameswera
dc.contributor.authorGeller, Aaron M.
dc.contributor.authorLeigh, Nathan
dc.contributor.authorShara, Michael
dc.contributor.authorPuzia, Thomas H.
dc.contributor.authorStetson, Peter B.
dc.date.accessioned2025-01-23T21:16:07Z
dc.date.available2025-01-23T21:16:07Z
dc.date.issued2019
dc.description.abstractWe report the discovery of a hot white dwarf (WD) companion to a blue straggler star (BSS) in the globular cluster (GC) NGC 5466, based on observations from the Ultra-Violet Imaging Telescope (UVIT) on board AstroSat. The Spectral Energy Distribution (SED) of the Far-UV detected BSS NH 84 was constructed by combining the flux measurements from four filters of UVIT, with GALEX, GALA, and other ground-based observations. The SED of NH 84 reveals the presence of a hot companion to the BSS. The temperature and radius of the BSS (T-eff = 8000(-250)(+1000) K, R/R-circle dot = 1.44 +/- 0.05) derived from Gemini spectra and SED fitting using Kurucz atmospheric models are consistent with each other. The temperature and radius of the hotter companion of NH 84 (T-eff = 32,000 +/- 2000 K, R/R-circle dot = 0.021 +/- 0.007) derived by fitting Koester WD models to the SED suggest that it is likely to be a hot WD. The radial velocity derived from the spectra along with the proper motion from GALA DR2 confirms NH 84 to be a kinematic member of the cluster. This is the second detection of a BSS-WD candidate in a GC, and the first in the outskirts of a low-density GC. The location of this BSS in NGC 5466 along with its dynamical age supports the mass-transfer pathway for BSS formation in low-density environments.
dc.description.funderSpanish MINECO
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ab11d0
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ab11d0
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101113
dc.identifier.wosidWOS:000466718700011
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectblue stragglers
dc.subjectglobular clusters: individual (NGC 5466)
dc.subjectbinaries: general
dc.subjectultraviolet: stars
dc.subjectwhite dwarfs
dc.titleDetection of a White Dwarf Companion to a Blue Straggler Star in the Outskirts of Globular Cluster NGC 5466 with the Ultraviolet Imaging Telescope (UVIT)
dc.typeartículo
dc.volumen876
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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