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26 April 2024 |
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Detection of White Dwarf Companions to Blue Straggler Stars from UVIT Observations of M67 | | Sindhu N
; Annapurni Subramaniam
; Aaron M Geller
; Vikrant Jadhav
; Christian Knigge
; Mirko Simunovic
; Nathan Leigh
; Michael Shara
; Thomas H Puzia
; | | Date: |
5 Aug 2019 | | Abstract: | We investigate the old open cluster M67 using ultraviolet photometric data of
Ultra-Violet Imaging Telescope in multi-filter far-UV bands. M67, well known
for the presence of several blue straggler stars (BSS), has been put to
detailed tests to understand their formation pathways. Currently, there are
three accepted formation channels: mass transfer due to Roche-lobe overflow in
binary systems, stellar mergers either due to dynamical collisions or through
coalescence of close binaries. So far, there had not been any confirmed
detection of a white dwarf (WD) companion to any of the BSSs in this cluster.
Here, we present the detection of WD companions to 5 bright BSSs in M67. The
multiwavelength spectral energy distributions covering 0.12 -11.5 $mu$m range,
were found to require binary spectral fits for 5 BSSs, consisting of a cool
(BSS) and a hot companion. The parameters (Luminosity, Temperature, Radius and
Mass) of the hot companions suggest them to be WDs with mass in the range 0.2 -
0.35 M$_{odot}$ with T$_{eff}$ $sim$ 11000 - 24000 K. | | Source: | arXiv, 1908.1573 | | Services: | Forum | Review | PDF | Favorites | |
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