English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the discovery of a hot white dwarf (WD) companion to a bluestraggler star (BSS) in the globular cluster (GC) NGC 5466, based onobservations from the Ultra-Violet Imaging Telescope (UVIT) on board AstroSat.The Spectral Energy Distribution (SED) of the Far-UV detected BSS NH 84 wasconstructed by combining the flux measurements from 4 filters of UVIT, withGALEX, GAIA and other ground-based observations. The SED of NH 84 reveals thepresence of a hot companion to the BSS. The temperature and radius of the BSS(T$_{\mathrm{eff}} = 8000^{+1000}_{-250}$ K, R/R$_\odot = 1.44 \pm 0.05$)derived from Gemini spectra and SED fitting using Kurucz atmospheric models areconsistent with each other. The temperature and radius of the hotter companionof NH 84 (T$_{\mathrm{eff}} = 32,000 \pm 2000$ K, R/R$_\odot = 0.021 \pm0.007$) derived by fitting Koester WD models to the SED suggest that it islikely to be a hot WD. The radial velocity derived from the spectra along withthe proper motion from GAIA DR2 confirms NH 84 to be a kinematic member of thecluster. This is the second detection of a BSS-WD candidate in a GC, and thefirst in the outskirts of a low density GC. The location of this BSS in NGC5466 along with its dynamical age supports the mass-transfer pathway for BSSformation in low density environments.

astrophysical journal/the astrophysical journal

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)