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29 March 2024
 
  » arxiv » 1907.5556

 Article overview


UVIT Open Cluster Study. I. Detection of a White Dwarf Companion to a Blue Straggler in M67: Evidence of Formation through Mass Transfer
N Sindhu ; Annapurni Subramaniam ; Vikrant V Jadhav ; Sourav Chatterjee ; Aaron M Geller ; Christian Knigge ; Nathan Leigh ; Thomas H Puzia ; Michael Shara ; Mirko Simunovic ;
Date 12 Jul 2019
AbstractThe old open cluster M67, populated with blue straggler stars (BSSs), is a well known test bed to study the BSS formation pathways. Here, we report the first direct detection of a white dwarf (WD) companion to a BSS in M67, using far-UV images from the extit{Ultra Violet Imaging telescope} ({it UVIT}) on {it ASTROSAT}. Near-simultaneous observations in three far-UV bands combined with {it GALEX}, {it IUE}, ground and space based photometric data covering 0.14 -11.5 $mu$m range for WOCS1007 were found to require a binary fit to its spectral energy distribution (SED), consisting of a BSS and a hot companion. On the other hand, a single spectral fit was found to be satisfactory for the SEDs of two other BSSs, WOCS1006 and WOCS2011, with the latter showing a deficient far-UV flux. The hot companion of WOCS1007 is found to have a T$_{eff}$ $sim$ 13250-13750K and a radius of 0.09$pm$0.01 R$_odot$. A comparison with WD models suggests it to be a low mass WD ($sim$ 0.18$M_odot$), in agreement with the kinematic mass from the literature. As a low mass WD ($<$ 0.4$M_odot$) necessitates formation through mass transfer (MT) in close binaries, WOCS1007 with a known period of 4.2 days along with its fast rotation, is likely to be formed by a case A or case B binary evolution.
Source arXiv, 1907.5556
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