Discovery of a barium blue straggler star in M67 and sighting of its WD companion*
Harshit Pal, Annapurni Subramaniam, Arumalla B. S. Reddy, Vikrant V., Jadhav

TL;DR
This paper reports the discovery of a barium-enhanced blue straggler star in M67 with a white dwarf companion, providing evidence of recent mass transfer and chemical enrichment in the cluster.
Contribution
First detection of a white dwarf companion to a barium blue straggler in M67, linking chemical enrichment to recent mass transfer events.
Findings
Barium blue straggler WOCS 9005 shows s-process element enhancement.
White dwarf companion identified through UV spectral energy distribution.
Estimated WD cooling age is approximately 60 million years.
Abstract
We report the discovery of a barium blue straggler star (BSS) in M67, exhibiting enhancements in slow neutron-capture (-) process elements. Spectroscopic analysis of two BSSs (WOCS\,9005 \& WOCS\,1020) and 4 stars located near the main-sequence turn-off using GALAH spectra, showed that WOCS\,9005 has a significantly high abundance of the s-process elements ([Ba/Fe] = 0.750.08, [Y/Fe] = 1.090.07, [La/Fe] = 0.650.06). The BSS (WOCS\,9005) is a spectroscopic binary with a known period, eccentricity and a suspected white dwarf (WD) companion with a kinematic mass of 0.5 M. The first `sighting' of the WD in this barium BSS is achieved through multi-wavelength spectral energy distribution (SED) with the crucial far-UV data from the UVIT/\textit{AstroSat}. The parameters of the hot and cool companions are derived using binary fits of the SED using two combinations of…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astronomical Observations and Instrumentation
