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Detection of White Dwarf companions to Blue Straggler Stars from UVIT observations of M67

Published online by Cambridge University Press:  11 March 2020

Sindhu N Open the ORCID record for Sindhu N [Opens in a new window] ,
Annapurni Subramaniam ,
Aaron M. Geller ,
Vikrant Jadhav ,
Christian Knigge ,
Mirko Simunovic ,
Nathan Leigh ,
Michael Shara  and
Thomas H. Puzia
Sindhu N
Affiliation:
School of Advanced Sciences, VIT, Vellore -632014, India email: sindhu.n@iiap.res.in Indian Institute of Astrophysics, Koramangala II Block, Bangalore-560034, India
Annapurni Subramaniam
Affiliation:
Indian Institute of Astrophysics, Koramangala II Block, Bangalore-560034, India
Aaron M. Geller
Affiliation:
CIERA and Department of Physics & Astronomy, Northwestern University, Evanston, IL60201, USA Adler Planetarium, Dept. of Astronomy, Chicago, IL60605, USA
Vikrant Jadhav
Affiliation:
Indian Institute of Astrophysics, Koramangala II Block, Bangalore-560034, India JAP and Physics Department, Indian Institute of Science, Bangalore - 560012, India
Christian Knigge
Affiliation:
School of Physics and Astronomy, University of Southampton, Southampton, UK
Mirko Simunovic
Affiliation:
Gemini Observatory, 670 N Aohoku Pl, Hilo, Hawaii96720 Subaru Telescope, 650 N Aohoku Pl, Hilo, Hawaii96720, USA
Nathan Leigh
Affiliation:
Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Concepción, Chile Department of Astrophysics, American Museum of Natural History, NY10024, USA
Michael Shara
Affiliation:
Department of Astrophysics, American Museum of Natural History, NY10024, USA
Thomas H. Puzia
Affiliation:
Institute of Astrophysics, Pontificia Universidad Católica de Chile, Santiago, Chile
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Abstract

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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 μm 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⊙ with Teff ~11000 –24000 K.

Keywords

open clusters and associations: individual (M67)stars: blue stragglersstars: white dwarfsultraviolet: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 482 - 485
Copyright
© International Astronomical Union 2020

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